Answer:
the glass and paper have diffrent charges
Explanation:
if the glass is charged positively then the paper was charged negatively
the to charges were to attract think of it as a magnet
A spring of k=500 N/m that is initially compressed 2m is used to launch a 100N load of bricks up a 2 m tall
hill. Find the speed of the bricks at the top of the hill.
e. What would the speed at the top of the hill be with 2m of initial compression if 15% of the energy is
dissipated through friction?
Speed of the bricks at the top of hill is calculated as 6.26 m/s. e) speed of the bricks at top of hill with 2 m of initial compression and 15% energy dissipation is calculated as 13.04 m/s.
What is energy?The capacity or power to do work, like the capacity to move any object by the application of force is called energy.
Initial potential energy of compressed spring:
Ep = 1/2 kx^2 = 1/2 * 500 N/m * (2 m)^2 = 1000 J
Here, k is spring constant, x is compression of the spring, and J is unit of energy in joules.
Final potential energy of the bricks:
Ep = m g h = 100 N * 9.81 m/s^2 * 2 m
= 1962 J
As, Ep = Ep
1/2 kx^2 = m g h
v = sqrt(2gh) = sqrt(2 * 9.81 m/s^2 * 2 m) = 6.26 m/s
Therefore, speed of the bricks at the top of the hill is 6.26 m/s.
e. If 15% of energy is dissipated through friction, final kinetic energy of the bricks at the top of hill will be 85% of initial potential energy of compressed spring.
0.85 * 1000 J = 1/2 mv^2
v = sqrt(170 / 1)
= 13.04 m/s
Therefore, speed of bricks at the top of the hill with 2 m of initial compression and 15% energy dissipation is 13.04 m/s.
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A bowling ball weighs 645 N.
What is the mass of the
bowling ball?
n = [?] kg
m
Answer:
Explanation:
To find the mass of an object, we can use the formula:
mass (m) = force (f) / acceleration (a)
Since the force on an object is equal to its weight, which is the force of gravity acting on it, we can use the equation:
mass (m) = weight (f) / acceleration (a)
where weight (f) = 645 N and acceleration (a) is the acceleration due to gravity, which is approximately 9.8 m/s^2 on the surface of the Earth.
So, we have:
mass (m) = 645 N / 9.8 m/s^2 = 66 kg
Therefore, the mass of the bowling ball is 66 kg.
A bowling ball weighs 645 N. then the mass of the bowling ball is 65.8 kg. Weight is gravitational force acting on the ball.
Given,
Weight W = 645 N
Acceleration due to gravity g = 9.8 m/s²
mass m = ?
The weight of the object is given by,
W = mg
645 = m*9.8
m = 65.8 Kg
Hence mass of the ball is 65.8 kg
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imagine a planet moving in a perfectly circular orbit around the sun. is this planet experiencing acceleration?
Yes, the planet is experiencing acceleration. If we imagine a planet moving in a perfectly circular orbit around the sun. is this planet experiencing acceleration?
Acceleration is defined as the rate of change of velocity, and since the planet is moving in a circular orbit, it is constantly changing its direction, resulting in an acceleration towards the center of the orbit. This is known as centripetal acceleration, and it is what keeps the planet in its circular path and prevents it from flying off into space. The magnitude of this acceleration depends on the speed of the planet, its distance from the sun, and the mass of the sun.
In conclusion, even though the planet is moving in a circular path and its speed may not be changing, its direction is constantly changing, causing it to experience acceleration. This centripetal acceleration ensures that the planet remains in its orbit around the sun.
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what condition is necessary for heat to flow between two objects?
Temperature difference, Material separating the objects, Heat transfer mechanism, Contact area & Time are the conditions necessary for heat flow.
What are conditions for heat flow?The following conditions are necessary for heat to flow between two objects:
Temperature difference: Heat always flows from an object with a higher temperature to an object with a lower temperature, so a temperature difference between the two objects is necessary for heat to flow.
Material separating the objects: Heat can only flow between two objects if there is a material that separates them. The type of material and its thermal conductivity will affect the rate at which heat flows.
Heat transfer mechanism: Heat can be transferred between objects through conduction, convection, or radiation. The specific heat transfer mechanism will depend on the conditions of the objects and the material separating them.
Contact area: The larger the contact area between the two objects, the greater the heat transfer will be.
Time: Heat transfer is a process that occurs over time, so a sufficient amount of time must be allowed for heat to flow from one object to the other.
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What is 180 f to c ?
180 degrees Fahrenheit is equal to 82.22 degrees Celsius.
Temperature is a measure of the average kinetic energy of the particles in a substance. Temperature conversion is the process of converting a temperature measurement from one unit to another. The most common units for temperature measurement are Celsius (C) and Fahrenheit (F).
The temperature conversion from Fahrenheit to Celsius can be done using the formula: C = (F - 32) * 5/9, where C is the temperature in Celsius and F is the temperature in Fahrenheit.
To convert 180 degrees Fahrenheit to Celsius, we can plug in the values into the formula:
C = (180 - 32) * 5/9
C = 148 * 5/9
C = 82.22
So, The temperature 180 degrees of Fahrenheit is equivalent to 82.22 degrees Celsius.
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How can I find a solution for Science Fiction Energy Rays That Might Suck Up Earthly Bodies, As Depicted Three Times In This Puzzle?
Unfortunately, there is no definitive answer to this puzzle as it is based on science fiction and is not a real-world phenomenon. However, there are several creative solutions that could be explored.
What is the fiction ?Fiction is a form of imaginative storytelling that can be found in books, movies, plays, television shows, and other creative works. It is based on the creative imagination of the writer, artist, or filmmaker, and is often set in a fictional world or universe separate from our own. Fiction can be thought of as an escape from reality, allowing the reader or viewer to explore different characters, settings, and situations, and to experience a story in a way that is not possible in real life. Fiction can range from the fantastical and magical to the mundane and ordinary, and can explore a wide range of topics, themes, and ideas. It can be used to entertain, to teach, to inspire, and to provoke thought.
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When you encounter a new or frightening situation, your body launches a stress response commonly known as
When you encounter a new or frightening situation, your body launches a stress response commonly known as "fight-or-flight” response.
What is "fight-or-flight” response?This is referred to as a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.
It involves the body responding to stress through different types of changes in the body system such as the heart pounding faster, muscles tighten, blood pressure rises, breath quickens, and your senses become sharper which is therefore the reason why it was chosen as the correct choice.
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The probability of the union of two events occurring can never be more than the probability of the intersection of two events occurring.A. True
B. False
Answer:
A. true
Suppose A = probability of a day occurring on the weekend
B = probability of day occurring last half of weekend
A int B = 2/7 * 1/2 = 1/7
obviously a Sun can occur only 1/7 of the time
A car starts from rest on a curve with a radius of 100m and tangential acceleration of 1.3m/s2 .Through what angle will the car have traveled when the magnitude of its total acceleration is 2.2m/s2 ?
The car will have traveled through an angle of approximately 9.29 degrees when the magnitude of its total acceleration is 2.2 m/s^2.
To solve this problem, we need to determine the magnitude of the radial acceleration experienced by the car as it moves along the curve. The radial acceleration can be found using the equation:
ar = v^2/r
where v is the tangential velocity of the car and r is the radius of the curve.
Since the car starts from rest, its initial tangential velocity is zero, and its radial acceleration is equal to its total acceleration. Therefore, we can write:
ar = a
a = v^2/r
We can rearrange this equation to solve for the tangential velocity of the car:
v = √(ar * r)
Substituting the given values, we have:
v = √(2.2 m/s^2 * 100 m) = 14.5 m/s
Next, we can use the tangential velocity to determine the angle through which the car has traveled. The tangential distance traveled by the car can be found using the equation:
d = v * t
where t is the time elapsed.
Since the tangential acceleration is given as 1.3 m/s^2, we can use this to determine the time elapsed:
a = v / t
t = v / a
Substituting the values, we have:
t = 14.5 m/s / 1.3 m/s^2 = 11.15 s
Finally, we can use the time elapsed and the radius of the curve to find the angle through which the car has traveled:
θ = d / r = v * t / r = (14.5 m/s) * (11.15 s) / (100 m) = 0.162 radians = 9.29 degrees
So, the car will have traveled through an angle of approximately 9.29 degrees when the magnitude of its total acceleration is 2.2 m/s^2.
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what is the pressure when a liquid is boiling at its normal boiling point?
Why is a direct comparison of station pressures difficult?
1. Station pressures change abruptly over small horizontal distances even when there is no appreciable change in elevation.
2. Weather stations are often at different altitudes
3. Aneroid barometers are extremely inaccurate
4. All of the above
Even when there is no discernible change in elevation, station pressures quickly shift across short horizontal distances.
What are the benefits of pressure altitude?Aircraft performance and flight levels are both based on pressure altitude, which is crucial for aircraft operating at or above 18,000 feet. Pressure altitude is adjusted for non-standard temperature to produce density altitude.
What distinguishes the altimeter setting from the station pressure?The station pressure, which is the actual barometric pressure of a location, is the pressure that is measured at a particular elevation. The pressure indication that is most frequently heard in radio and television broadcasts is the altimeter setting. It is not the station's actual barometric pressure.
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Determine whether an interference pattern is observed on other side of the slits in each of the following experiments. a. An electron beam is aimed at two closely spaced slits. The beam is attenuated to produce only 1 electron per minute. b. An electron beam is aimed at two closely spaced slits. A light beam is placed at each slit to determine when an electron goes through the slit. c. A high-intensity light beam is aimed at two closely spaced slits. d. A gun is fired at a solid wall containing two closely spaced slits.
Two slits with close spacing are the target of an electron beam. It is possible to tell when an electron passes through a slit by placing a laser beam at each one. (Position b)
What does intensity look like?The amount of physical power the body consumes during an activity is known as its intensity and is expressed as a percentage of the maximal oxygen consumption. To walk a mile in 20 minutes, for instance, a certain amount of exercise intensity is required.
How do people behave with intensity?Arousal, dedication, effort, assertiveness, and attentional concentration are just a few of the traits that can be used to measure how well a person does in a given activity or sector. additionally known as performance intensity.
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Replace the loading acting on the beam by a single resultant force. specify where the force act, measured from B
The question is incomplete but the resultant force would act along the straight lines that were holding the beam.
What is the resultant force?
The resultant force, also known as the net force, is the single force that has the same effect as all of the individual forces acting on an object. It represents the overall effect of all forces on an object, taking into account their magnitude, direction, and type (compressive, tensile, frictional, etc.).
The concept of the resultant force is important in mechanics and engineering, as it determines the motion of an object. For example, if the net force acting on an object is zero, the object is said to be in a state of equilibrium and will not accelerate or change its velocity. On the other hand, if the net force on an object is not zero, the object will accelerate in the direction of the net force.
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In a calorimetry experiment, a 50-gram sample of liquid water went from 25°C to 29°C. How much heat energy (in calories) did this sample of water absorb?
Taking into account the definition of calorimetry, the heat energy that this sample of water absorbed is 199.87 cal.
Definition of sensible heatSensible heat is defined as the amount of heat that a body absorbs or releases without affecting its molecular structure.
The expression that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Heat energy in this caseIn this case, you know:
Q= ?c= 4.184 J/gCm= 50 gΔT= Tfinal - Tinitial= 29°C - 25°C= 4 °CReplacing in the definition of sensible heat:
Q = 4.184 J/gC× 50 g× 4 C
Solving:
Q= 836.8 J= 199.87 cal (1 J= 0.238846 cal)
Finally, the heat in this case is 199.87 cal.
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What type of research highlights causality, allowing the cause to be separated from the effect?
In psychology research, the laboratory experiment has long been regarded as the "gold standard."
This is so that causality can be clearly established and because only laboratory experiments can distinguish between cause and effect.
What is a laboratory?
The evidence suggests that Pythagoras of Samos, a well-known Greek philosopher and scientist, had a laboratory in his home.
This laboratory was set up by Pythagoras, who experimented with sound tones and string vibration.
In a painting by Albert Edelfelt from 1885, Louis Pasteur is shown comparing a note in his left hand to a bottle containing a solid in his right hand, without wearing any personal protective equipment.
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If the tides are caused by the gravitational pull of the Moon, why are there multiple tide cycles within one rotation of the moon?
Answer:
Because the sun attracts the earth, and there will be a high tide when the sun is about overhead and a low tide when the earth is between the sun and the water causing the tide.
21.__ contribute most of the organic material that forms humus.
A. Animals
B. Bacteria
C. Decomposers
D. Plants
is friction negligible
Friction is not always negligible, as it can have significant effects on the behavior of objects in motion.
Friction is a force that opposes the motion of two surfaces in contact with each other. The magnitude of the frictional force depends on the nature of the surfaces in contact, the force pressing the surfaces together, and the relative motion between the surfaces.
In some cases, the effects of friction can be ignored because they are small compared to other forces at play. For example, in situations where an object is moving through a fluid, such as air or water, the effects of friction may be negligible compared to the forces of drag and buoyancy.
In other situations, the effects of friction cannot be ignored. For example, in a car's braking system, the friction between the brake pads and the rotor is necessary to slow down and stop the car. Without this friction, the car would not be able to come to a complete stop.
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What are nodes and antinodes?
Nodes are points with zero amplitude, while antinodes are points with maximum amplitude in standing waves.
Nodes and antinodes are terms used to depict the areas of least and most extreme amplitudes, separately, in standing waves. A standing wave is a wave that has all the earmarks of being fixed on the grounds that it is the consequence of the obstruction of two rushes of a similar recurrence and plentifulness going in inverse headings.
Nodes are focuses along the standing wave where the plentifulness is zero. These focuses relate to where the peak of one wave agrees with the box of the other wave, bringing about horrendous impedance.
Antinodes, then again, are focuses along the standing wave where the plentifulness is at a most extreme. These focuses relate to where the peaks and box of the two waves support one another, subsequent in helpful obstruction.
Nodes and antinodes are significant in many fields, including acoustics, optics, and quantum mechanics.
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what is third variable problem?
The third variable problem refers to the possibility that a correlation between two variables may be caused by a third variable that is related to both of them.
In research, it is common to find a correlation between two variables, but it is important to consider the possibility that another factor may be influencing the relationship between those variables. This is where the third variable problem arises.
For example, if researchers find a correlation between ice cream consumption and crime rates, it would be erroneous to conclude that eating ice cream causes crime. It is possible that a third variable, such as temperature, could be influencing both ice cream consumption and crime rates.
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Rank each pendulum on the basis of the maximum kinetic energy it attains after release_ Rank from largest to smallest To rank items as equivalent; overlap them View Available Hint(s) Reset Help h -60 cm m = 2 kg h = 30 cm m=4kg h =30 cm m =2kg h =60 cm m =lkg h =45 cm m=3kg h=I5 cm m = 8 kg largest smallest The correct ranking cannot be determined_
Ranking the pendulums based on the maximum kinetic energy they attain after release, from largest to smallest, is not possible with the information provided.
What is its maximum kinetic energy ?The amplitude of the swing, the mass of the pendulum, and the height at which it is released are some of the variables that affect a pendulum's maximum kinetic energy. The height and mass of each pendulum are mentioned in the material; the there is no obvious pattern in the mass and height combinations of the pendulums that would permit a ranking based only on those variables.As a result, with the information provided, it is impossible to determine the pendulums' proper ranking.
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what is the optimal temperature for lactase activity?
The optimal temperature for lactase activity is : 125 to 135 degrees F
What is the optimal temperature for lactase activity?125 to 135 degrees F is the optimum temperature for lactase activity. At temperatures higher than this range, enzyme quickly becomes denatured and is therefore unable to break down the milk sugar.
Optimum pH for lactose hydrolysis is 6.5, which is very close to the pH of milk. Heating lactase for 1 min results in 97% inactivation at 60° C and complete inactivation at 70° C and some inactivation also occurs at 40° C over 1-hour incubation.
It was observed that heat treatment of milk increases lactase activity, with maximum activity increase found when milk was heated at 55°C.
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What is the Lewis structure for PF6?
The Lewis structure for PF6 has a central phosphorus atom with six surrounding fluorine atoms. Each fluorine atom is bonded to the phosphorus atom by a single bond and has a lone pair of electrons.
PF6 is a polyatomic ion, which means it has a charge. In this case, the charge is -1. The Lewis structure shows how the atoms in the ion are connected and how the electrons are distributed.
The six fluorine atoms form a symmetric octahedral arrangement around the phosphorus atom. Each fluorine atom contributes one electron to form a single bond with the phosphorus atom. The lone pairs on each fluorine atom are not involved in bonding and are localized on the atom.
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occurs in what month is halfway between the winter solstice and the spring equinox
Halfway between the winter solstice and the spring equinox is the month of February in the Northern Hemisphere and August in the Southern Hemisphere.
When is Winter Solstice & Spring Equinox?The winter solstice occurs on December 21st or 22nd and marks the shortest day and longest night of the year. The spring equinox occurs on March 20th or 21st and marks the start of spring, when the day and night are roughly equal in length.
Halfway between these two events is approximately February 10th in the Northern Hemisphere and August 10th in the Southern Hemisphere. This is when the days start to get noticeably longer and the sun starts to rise higher in the sky, signaling the end of winter and the beginning of spring.
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3. A baseball player leads off the game and hits a long home run. The ball leaves the bat at
an angle of 30.00 from the horizontal with a velocity of 40.0 m/s. How far will it travel in
the air?
A baseball player launches a big home run to start the game. The ball leaves the bat with a speed of 40.0 m/s and an angle of 30.0° from the horizontal.
What is Projectile Motion?An item or particle that is propelled into a gravitational field, for example from the surface of the Earth, and moves across a curved route only under the influence of gravity is said to be experiencing projectile motion. Most calculations make the assumption that the effects of air resistance are passive and insignificant in the specific instance of Earth projectile motion. The curving path of objects in projectile motion was proved by Galileo to be a parabola, but it could also be a straight line in the specific situation when it is hurled directly upwards. One such trajectory is a ballistic trajectory, which is the study of such motions.
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How do you calculate density altitude?
Density altitude is a measurement of air density used to estimate aeroplane performance. It is determined by combining temperature, pressure, and humidity. The density altitude formula is as follows:
Pressure altitude + [120 x (OAT - ISA temperature)] = density altitude
In the above formula:
The height in the standard atmosphere where the atmospheric pressure equals the measured pressure is referred to as pressure altitude.
OAT is the temperature of the outside air in degrees Celsius.
The International Standard Atmosphere (ISA) temperature is the standard temperature for a certain altitude (ISA).
The altitude in feet above sea level at which the air density is equal to the air density at the actual altitude, temperature, and pressure is the outcome of this computation. A high density altitude indicates that the air is less dense, which can reduce aircraft performance, whereas a low density altitude indicates that the air is denser, which can improve aircraft performance.
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suppose that you lift an object by exerting an upward force of 12 newtons on it. if gravity exerts a force of 10 newtons downward on the object, what is the total force on the object?
a. 12 newtons.
b. 10 newtons.
c. 2 newtons.
d. 22 newtons.
The total force on the object is 2 newtons.
What is upward force?
Upward force is a force that acts in an upward direction. It is a force that opposes the downward force of gravity. It is the force that allows an object to rise upwards and resist the pull of gravity. This upward force can be generated by air resistance, buoyancy, or a combination of both. Upward force is also known as lift. It is commonly used in aerodynamics and propulsion systems. Examples of upward force include the lift generated by a plane’s wings, the thrust of a rocket engine, and the buoyancy of a balloon.
The upward force is 12 newtons.
The gravity is exerting a force of 10 newtons downward on the object.
Then Subtract because they are in opposite directions.
12 - 10 = 2 newtons.
Therefore, 2 newtons is the correct answer.
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What two things must you know to describe the motion of an object?
Both the direction and the speed of an object's motion must be included when describing motion. You also have to reveal its location at a specific time.
What are some ways to describe how an object moves?Position, direction, speed, and acceleration are used to characterise an object's motion. Motion is the gradual alteration of a body's position or orientation. Translational motion is defined as the movement of an object along a line or a curve.
Which two numbers are appropriate to use when describing motion?Scalars or vectors are the two types of variables that are typically employed to describe motion. A quantity whose magnitude and direction may both be used to fully describe it is referred to as a vector. Any quantity whose magnitude alone can adequately explain it is referred to as a scalar.
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Q2. People say, "magnetic north pole of the earth is present in the geographical south pole Using a compass and the knowledge of attraction between magnets, can you prove this theory?
We can prove this fact using a compass. The compass needle's north is always pointed towards the geographic north. It is because the geographic north of earth is its magnetic south pole and will attracts the north pole of compass.
What are magnetic poles ?A magnet have its strongest field strength at it poles. A magnet is having two poles namely magnetic south and magnetic north poles. The magnetic field lines at south pole is inwards whereas, it is outwards at north pole.
Two unlike poles of a magnet attracts each other and two like poles will repel each other as in the case of charges. The magnetic north pole of a compass will be always pointed towards the geographic north.
This fact is clearly observable with a compass. It is because, the magnetic south of the earth's magnetic field is located in its geographic north pole. That is why the compass north pole is attracted towards the south pole of earth's magnet that is at the north of earth.
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Una pelota de plástico de 12. 3 g cuelga de un hilo de 28. 6 cm que esta sujeto a una pared vertical. Un campo eléctrico se encuentra en el cuarto. Cuando se le da a la pelota una carga de -1. 11 mC, se observa que permanece suspendida haciendo un ángulo de 17. 4° entre el hilo y la pared. ¿Cuál es la magnitud del campo eléctrico y su dirección?
La magnitud del campo eléctrico es de 4.03 x 10⁶ N/C y su dirección es perpendicular a la pared y hacia arriba.
How to determine Campo electricoEl campo eléctrico es de 12,29 N/C con dirección hacia arriba. Esto se calcula usando el principio de conservación de la energía, el cual afirma que el trabajo realizado para cargar la pelota de plástico de 12,3 g con una carga de -1,11 mC es igual al trabajo necesario para sostenerla en un ángulo de 17,4° con el hilo de 28,6 cm.
Así, la magnitud del campo eléctrico se calcula usando la siguiente fórmula:
E = W/q
= (mgh x sin(θ))/q
= (0,0123 x 9,81 x 28,6 x sin(17,4°))/(-1,11x10⁻³)
= 12,29 N/C
La magnitud del campo eléctrico se puede encontrar utilizando la ley de Coulomb y la trigonometría. La ley de Coulomb establece que la fuerza eléctrica entre dos cargas es igual a la constante de Coulomb (k) multiplicada por el producto de las dos cargas dividido por la distancia entre ellas al cuadrado.
En este caso, la fuerza eléctrica es igual a la fuerza gravitacional, ya que la pelota permanece suspendida. Por lo tanto, podemos escribir:
Fe = Fg
k x q₁ x q₂ / r² = m x g
Donde Fe es la fuerza eléctrica, Fg es la fuerza gravitacional, q₁ y q₂ son las cargas, r es la distancia entre ellas, m es la masa de la pelota y g es la aceleración debida a la gravedad.
Utilizando la trigonometría, podemos encontrar la distancia entre la pelota y la pared, que es igual a la longitud del hilo multiplicada por el coseno del ángulo entre el hilo y la pared. Por lo tanto, r = 28.6 cm x cos(17.4°) = 26.9 cm.
Sustituyendo los valores conocidos en la ecuación y resolviendo para q_2, obtenemos:
q₂ = (m x g x r²) / (k xq1)
q₂ = (12.3 g x26.9 cm²) / (9 x 10⁹ N x m²/C² x -1.11 x 10⁻³ C)
q₂ = -2.99 x 10⁻⁶ C
La magnitud del campo eléctrico es igual a la fuerza eléctrica dividida por la carga, por lo que:
E = Fe / q₂
E = (m x g) / q₂
E = (12.3 g x 9.8 m/s²) / (-2.99 x 10⁻⁶ C)
E = -4.03 x 10⁶ N/C
La dirección del campo eléctrico es perpendicular a la pared y hacia arriba, ya que la pelota está suspendida y la fuerza eléctrica es igual a la fuerza gravitacional.
En conclusión, la magnitud del campo eléctrico es de 4.03 x 10⁶ N/C y su dirección es perpendicular a la pared y hacia arriba.
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