Answer:
v_{4}= 80.92[m/s] (Heading south)
Explanation:
In order to calculate this problem, we must use the linear moment conservation principle, which tells us that the linear moment is conserved before and after the collision. In this way, we can propose an equation for the solution of the unknown.
ΣPbefore = ΣPafter
where:
P = linear momentum [kg*m/s]
Let's take the southward movement as negative and the northward movement as positive.
[tex]-(m_{1}*v_{1})+(m_{2}*v_{2})=-(m_{1}*v_{3})+(m_{2}*v_{4})[/tex]
where:
m₁ = mass of car 1 = 14650 [kg]
v₁ = velocity of car 1 = 18 [m/s]
m₂ = mass of car 2 = 3825 [kg]
v₂ = velocity of car 2 = 11 [m/s]
v₃ = velocity of car 1 after the collison = 6 [m/s]
v₄ = velocity of car 2 after the collision [m/s]
[tex]-(14650*18)+(3825*11)=(14650*6)-(3825*v_{4})\\v_{4}=80.92[m/s][/tex]
help please i give brainlyest
D is the correct answer!
Answer; D is the answer
Explanation:
Why did it take Kepler so long to discover the truth about the motions of the solar system?
Answer:
Look below :) Hope this helped. Please provide Brainliest, as reporters took all I had away. Thanks!
Explanation:
Kepler's family was Lutheran and he adhered to the Augsburg Confession a defining document for Lutheranism. However, he did not adhere to the Lutheran position on the real presence and refused to sign the Formula of Concord. Because of his refusal he was excluded from the sacrament in the Lutheran church. This and his refusal to convert to Catholicism left him alienated by both the Lutherans and the Catholics. Thus he had no refuge during the Thirty-Years War.
The Holy Roman Empire of German Nationality at the Time of Kepler
The Holy Roman Empire of German Nationality at the Time of Kepler.
In 1612 Lutherans were forced out of Prague, so Kepler moved on to Linz. His wife and two sons had recently died. He remarried happily, but had many personal and financial troubles. Two infant daughters died and Kepler had to return to Württemburg where he successfully defended his mother against charges of witchcraft. In 1619 he published Harmonices Mundi, in which he describes his "third law."
In spite of more forced relocations, Kepler published the Epitome Astronomiae in 1621. This was his most influential work and discussed all of heliocentric astronomy in a systematic way. He then went on to produce the Rudolphine Tables that Tycho had envisioned long ago. These included calculations using logarithms, which he developed, and provided perpetual tables for calculating planetary positions for any past or future date. Kepler used the tables to predict a pair of transits by Mercury and Venus of the Sun, although he did not live to witness the events.
Johannes Kepler died in Regensburg in 1630, while on a journey from his home in Sagan to collect a debt. His grave was demolished within two years because of the Thirty Years War. Frail of body, but robust in mind and spirit, Kepler was scrupulously honest to the data.
Short Biography -|- Kepler's Firsts -|- Kepler's Laws -|- People and Events in Kepler's Time -|- Articles
Biographies and books -|- Web Sites -|- IYA Kepler
A List of Kepler's Firsts
First to correctly explain planetary motion, thereby, becoming founder of celestial mechanics and the first "natural laws" in the modern sense; being universal, verifiable, precise.
In his book Astronomia Pars Optica, for which he earned the title of founder of modern optics he was the:
First to investigate the formation of pictures with a pin hole camera;
First to explain the process of vision by refraction within the eye;
First to formulate eyeglass designing for nearsightedness and farsightedness;
First to explain the use of both eyes for depth perception.
Another coin is thrown up into the air and hit the ground after 6s with a velocity of -60 m/s after experiencing an acceleration of -9.8 m/s2. What was its initial velocity?
Answer:
Vf = Vi + a t fundamental equation
-60 m/s= Vi - 9.8 m/s^2 * 6 sec taking upward direction as positive
Vi =58.8 m/s - 60 m/s = -1.2 m/s so the coin was initially thrown downward
As a check take the downward direction as positive
Vf = 1.2 m/s + 58.8 m/s = 60 m/s
3. A runner moving at a speed of 8.8m/s rounds a bend of radius 25m. Find the centripetal force of the 700N runner.
Answer:
Explanation:
Centripetal force is expressed as;
F = mv²/r
m is the mass = 700/10 = 70kg
v = 8.8m/s
r = 25m
Required
Centripetal force
Substitute the given parameters into the formula;
F = 70*8.8²/25
F = 70 * 77.44/25
F = 5420.8/25
F = 216.832N
Hence the centripetal force of the runner is 216.832N
What is the displacement of the elephant between 0s and 16 s?
m
What is the distance traveled by the elephant between 0s and 16 s?
m
Answer:
Displacement is 9m
Distance traveled is 9m
A 1500 kg car is parked at the top of a hill 5.2 m high. What is the velocity of the car, in meters per second, when it reaches the bottom of the hill?
Answer:
Explanation:
The car will fall with acceleration due to gravity which is equal to 9.8 m /s²
For downward fall ,
initial velocity u = o
acceleration due to gravity = g = 9.8 m /s
final velocity v = ?
displacement h = 5.2 m
v² = u² + 2 gh
v² = 0 + 2 x 9.8 x 5.2
= 101.92
v = 10.1 m /s
A track star runs 100 meters in 10 seconds. What is the star's average speed?
Answer:
10m/s
Explanation:
Answer: 10
Explanation: Because, 10*10= 100 or 100/10=10
A book is laying on the floor (in equilibrium). If you were only given the normal force describe how you would go about finding the mass of the book.
Answer
divide by 9.8 or 10
Explanation:
normal force equals to the weight, which is equal to mass* gravitational force
A standard baseball has a mass of 145 g. What is the weight of a standard baseball?
Answer: 1.42 N
Explanation:
Just took
Greg is giving a slide show presentation to a large audience. How might a laser best help him with the presentation?
A)He can use the laser to enlarge images on slides.
B)He can use the laser to point to specific information on the slides.
C)He can use the laser to scan and record information about the slides.
D)He can use the laser to make the images more clear.
Answer:
he can use the laser to point to specific information on the slides.
he can use the laser to point to specific information on the slides.Explanation:
He can use the laser to point to specific information on the slides might a laser best help him with the presentation. Hence, option B is correct.
What is meant by specific information?When something is referenced in the text, "specific information" refers to an explicit, precise fact or description of that item. Generally speaking, general information is nebulous and serves as a wide description of something.
A particular instance is a particular example. In order to present a specific example of technology, one could write about specific individuals using a specific machine. You would need to write about specific individuals in order to provide a concrete example of any human activity.
There are various specific issues that need to be resolved. To address particular challenges, specific groups may be formed. I prompted him to provide further details. She is from the United States, namely Boston.
Thus, option B is correct.
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Choose the best equation below to solve this kinematics question:
An aircraft has to have a final velocity of 33 m/s at the end of a runway to be able to liftoff. What acceleration rate would the plane need if it starts from rest and has a runway 240 m long?
A) vf = vi +atvf = vi +at
B) d =12 (vi +vf)t d =12 (vi +vf)t
C) d = vit + 12at2d = vit + 12at2
D) (vf)2 = (vi)2 +2ad
Answer:
(D) Vf² = Vi² + 2ad
a = 2.269 m/s²
Explanation:
Given;
final velocity of the aircraft, Vf = 33 m/s
initial velocity of the aircraft, Vi = 0
distance traveled by the plane, d = 240 m
The acceleration of the plane is given by the following kinematic equation;
Vf² = Vi² + 2ad
where;
a is the acceleration;
Based on the given options, the correct option is "D".
Calculating the acceleration with the chosen equation;
Vf² = Vi² + 2ad
Vf² = 0+ 2ad
Vf² = 2ad
a = Vf² / 2d
a = (33)² / (2 x 240)
a = 2.269 m/s²
In which of the following ways is region B in the diagram different from region D? (1 point)
A
Region B, the corpus callosum, separates the brain into two halves while region D, the cerebellum, communicates between the two halves.
B
Region B, the cerebrum, is one single unit composed of gray matter, while region D, the cerebellum, is divided into two hemispheres.
C
Region B, the corpus callosum, is composed of several lobes while region D, the cerebellum, only has one lobe.
D
Region B, the cerebrum, is divided into two hemispheres while region D, the cerebellum, is one single structure.
Answer:
C
Explanation:
Answer:
C
Region B, the corpus callosum, is composed of several lobes while region D, the cerebellum, only has one lobe.
Explanation:
A scientist is observing a eukarotic cell and a prokaryotic cell. Which structure could she only observe in the eukaryotic cell?
cytoplasm
DNA
ribosomes
a nucleus
Answer:
It's definitely Nucleus
Hope this Helps!
What are three examples of objects that float in water?
(Please don't copy and paste)
Answer:
anything inflated, a can, and a pencil.
Explanation:
these objects can flaot on water because theyre mass is not enough for the objects to sink.
Even though every action force has an equal but opposite reaction
force, they do not cancel one another and motion may still occur because
the
Answer: Action and reaction forces are applied to different objects
Explanation:
Answer:
action and reaction forces are applied to different objects
Explanation:
an electric current 0.75 a passes through a circuit that has a resistance of 175. according to ohm's law, what is the voltage of the circuit
Answer:
131.25
Explanation:
i worked it out on a diffrent sheet so its hard to explain
Answer:131 is the right answer
Explanation:
It is better to go along with whatever the group is doing rather than being a little uncomfortable, staying through it yourself, and saying, no.
A: True
B: False
Answer:
true stick up for urself
How will you express the following in m: a. 10 nm b. 110 pm c. 120 mm d. 200 km
Please help me
Answer:
1 km = 1000 m
1 m = 100 cm
1 m = 1000 mm
1 cm = 10 mm
hope this helps u figure it out :)
-)
A 1100 kg car is accelerating at 2m/s2. Find the net force acting on the car.
Answer:
2200 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 1100 × 2
We have the final answer as
2200 NHope this helps you
Un objeto que es empujado sobre una superficie plana, tiene una masa de 80 kg y dicha fuerza tiene un valor de 300 N. Calcule la fuerza Normal y la fuerza de Fricción para que este en equilibrio. A. Ff=300 N N=784.8 N B. Ff=300 N N=780 N C. Ff=200 N N=750 N AYUDENME POR FA LA NECESITO
Responder:
A. Ff = 300 N N = 784,8 N
Explicación:
Dado
Masa del cuerpo = 80 kg
Fuerza de movimiento Fm = 300N
Dado que el cuerpo no está acelerando, la fuerza de fricción (Ff) es igual a la fuerza de movimiento que actúa sobre el cuerpo, ya que la fuerza de fricción es una fuerza de oposición, es decir, Fm = Ff
Dado que Fm = 300N, Ff = 300N
La reacción normal que actúa en el cuerpo es igual al peso.
N = W = mg
g es la aceleración debida a la gravedad
g = 9,8 m / s
N = mg
N = 80 (9,81)
N = 784,8N
Por tanto, la fuerza normal que actúa sobre el cuerpo es 784,8 N
A car slows down from 65 km/s to 30 km/s in 5 seconds. What is its acceleration?
How fast is a wave traveling if it has a wavelength of 7 meters and a frequency of 11 Hz?
Answer:
[tex] \huge{ \boxed{ \bold{ \sf{77 \: m/s}}}}[/tex]
☯ Question :
How fast is a wave travelling if it has a wavelength of 7 meters and a frequency of 11 Hz?☯ [tex] \underbrace{ \sf{Required \: Answer : }}[/tex]
☥ Given :
Wavelength ( λ ) = 7 metersFrequency ( f ) = 11 Hz☥ To find :
Speed of sound ( v ) = ?☄ We know ,
[tex] \boxed{ \sf{v = f \times λ}}[/tex]
where ,
v = speed of soundf = frequencyλ = wavelengthNow, substitute the values and solve for v.
➺ [tex] \sf{v = 11 \times 7}[/tex]
➺ [tex] \boxed{ \sf{v = 77 \: m/s}}[/tex]
-------------------------------------------------------------------
✑ Additional Info :
Frequency : The number of complete vibrations made by a particle of a body in one second is called it's frequency. It is denoted by the letter f . The SI unit of frequency is hertz ( Hz ).Wavelength : The distance between two consecutive compressions or rarefactions of a sound wave is called wavelength of that wave. It is denoted by λ ( lambda ) and it's SI unit is m.Speed of a sound wave : The distance covered by a sound wave in one second is called speed of sound wave. It depends on the product of wavelength and frequency of the wave.Hope I helped!
Have a wonderful time! ツ
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2. A Se lanza un electrón con rapidez inicial v0 = 1.60×106 m/s hacia el interior de un campo uniforme entre las placas paralelas de la figura E21.33. Suponga que el campo entre las placas es uniforme y está dirigido verticalmente hacia abajo, y que el campo fuera de las placas es igual a cero. El electrón ingresa al campo en un punto equidistante de las dos placas. A) Si el electrón apenas elude la placa superior al salir del campo, encuentre la magnitud del campo eléctrico. B) Suponga que en la figura E21.33 el electrón es sustituido por un protón con la misma rapidez inicial v0. ¿Golpearía el protón una de las placas? Si el protón no golpea ninguna de las placas, ¿cuáles serían la magnitud y la dirección de su desplazamiento vertical, cuando sale de la región entre las placas? C) Compare las trayectorias que recorren el electrón y el protón, y explique las diferencias. D) Analice si es razonable ignorar los efectos de la gravedad para cada partícula.
Answer:
A) E = 145.6 N / C , B) y= 2,8 10-7 m with a downward direction
C) he shape of the trajectory of the two particles is to simulate a parabola,
D) F_{e} /F_{g} = 10³⁴
Explanation:
A) For this exercise we use Newton's second law to find the acceleration of the electron, where the force is electric
F = m a
- e E = m a
a = - e E / m
with the field directed downward, the acceleration is in the vertical upward direction.
We look for how much the electron moves with kinematics, in the x direction there is no acceleration,
x axis (parallel to plates)
x = v₀ t
t = x / v₀
y axis (perpendicular to plates)
y = y₀ + [tex]v_{oy}[/tex] t + ½ a t²
Let's take the zero of the system in the middle of the plates y₀ = 0, also the initial vertical velocity is zero (v_{oy} = 0) the width of the plate is known
y = ½ a t²
we substitute
y = ½ (e E /m) (x / v₀)²
y = ½ e x2 /m v₀² E
we look for the electric field
E = 2 m y v₀² / e x²
where to use this expression the length and width of the condenser must be known, suppose that the length is x = l = 1 cm = 1 10⁻² m and the width is y = 0.5 mm = 0.5 10⁻³ m
let's calculate
E = 2 9.1 10⁻³¹ 0.5 10⁻³ (1.6 10⁶)² / (1.6 10⁻¹⁹ (1 10⁻²)²)
E = 145.6 N / C
B) The electron is exchanged for a proton
Let's look for the vertical displacement, in this case as the proton has a positive charge it moves towards the bottom of the plates
y = ½ e x² / m v₀² E
y = ½ 1.6 10⁻¹⁹ 1 10⁻⁴ / (1.67 10⁻²⁷ (1.6 10⁶)² 145.6
y = 28.4375 10⁻⁸ m
since the distance between the plates is 0.5 10-3 m, the proton passes the condensate because its deflection is very small
In summary, its displacement is y= 2,8 10-7 m and with a downward direction (the same direction of the electric field)
C) The shape of the trajectory of the two particles is to simulate a parabola, but one for having a negative charge (electron) the force is upwards and the other for having a positive charge (proton) the trajectory is downwards
D) The force of gravity
[tex]F_{g}[/tex] = G m M / R²
electron
Between the electron and the positive charges of the conducting plate
F_{g}= 6.67 10⁻¹¹ 1.67 10⁻²⁷ 9.1 10⁻³¹ / (0.5 10⁻³)²
F_{g} = 4.1 10⁻⁵¹ N
electric force
F_{e} = -e E
F_{e} = - 1.6 10⁻¹⁹ 145.6
F_{e} = 2.3 10⁻¹⁷ N
let's look for the reason between these two forces
F_{e} / F_{g} = 2.3 10⁻¹⁷ / 4.1 10⁻⁵¹
F_{e} /F_{g} = 10³⁴
We see that the electric force is many orders of magnitude higher than the gravitational force.
The table below compares the solubility of two substances in 100 milliliters (mL) of water.
SOLUBILITY OF SUBSTANCES
Solubility Temperature l Sucrose l Hydrochloric acid
l Grams/100mL water l Grams/100mL water
--------------------------------------------------------------------------------------------------------
Solubility at 20°C l 204 l 720
--------------------------------------------------------------------------------------------------------Solubility at 100°C l 488 l 989
Based on the table, which of the following statements is true?
The solubility of sucrose increases if more is dissolved.
The solubility of sucrose decreases as temperature increases.
The solubility of hydrochloric acid increases if more is dissolved.
The solubility of hydrochloric acid increases as temperature increases.
Answer:
d
Explanation:
I did the test and got it right.
Based on the table, the statement that is true about the solubility of two substances in 100 milliliters is the solubility of hydrochloric acid increases as temperature increases. The correct option is d.
What is solubility?Solubility is a condition when the solute is fully mixed with the solvent and there is no difference between the molecules of solvent and the solutes. The solubility of a substance is based on its molecules. If they are polar, then they can dissolve in numerous solvents.
The salt molecules are fully soluble in the water. The molecules which get dissolved are called the solute and the molecules that dissolve something within them, are called solvents.
Thus, the correct option is d, The solubility of hydrochloric acid increases as temperature increases.
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A jumbo jet weighing 65,000 kg Is accelerating at 3 m/s^2 while its jet engines are putting out 200000 N of thrust.
How much air drag acts on the craft?
Please, show your work.
Answer:
Fa = 5000 [N]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
Let's assume that the movement of the plane is to the right, any movement or force to the right will be marked with a positive sign, while any force or movement to the left, will be taken as negative.
The force of the turbine drives the plane to the right, therefore it is positive, the acceleration is constant and keeps the movement to the right, therefore it is positive, the wind drag force tries to prevent the movement of the plane to the left therefore it is negative, with this analysis we deduce the following equation.
ΣF = m*a
where:
ΣF = sum of forces [N] (units of Newtons)
m = mass = 65000 [kg]
a = acceleration = 3 [m/s²]
Fa = force exerted by the air [N]
200000 - Fa = 65000*3
Fa = 200000 - (3*65000)
Fa = 5000 [N]
Un auto parte desde un lugar a las 6:00 de la mañana con una rapidez de 150 Km/hr a través de una carretera recta. a) ¿Qué distancia habrá recorrido a las 10:00 de la mañana? b) ¿A qué hora habrá recorrido 900 Km?
Answer:
600 km
6 hours
Explanation:
El tiempo que viaja el automóvil de 6 a 10 de la mañana es [tex]10-6=4\ \text{horas}[/tex]
La velocidad del coche es 150 km/hr
La distancia está dada por
[tex]\text{Distancia}=\text{Velocidad}\times \text{Tiempo}[/tex]
[tex]150\times 4=600\ \text{km}[/tex]
A distancia recorrida a las 10 de la mañana es de 600 km.
Ahora el tiempo que se toma está dado por
[tex]\text{Tiempo}=\dfrac{\text{Distancia}}{\text{Velocidad}}[/tex]
[tex]\dfrac{900}{150}=6\ \text{horas}[/tex]
El tiempo que se tarda en recorrer 900 km es de 6 horas.
A space station has a mass M and orbits Earth in a circular orbit at a height above Earth’s surface. An astronaut in the space station appears weightless because the astronaut seems to float. Which of the following claims is true about the force exerted on the astronaut by Earth ?
A) there is no force exerted on the astronaut by Earth because the astronaut is 400km above Earth’s surface
B) the force exerted on the astronaut by Earth is less than the force exerted by the astronaut because the astronaut is 400km above Earths surface
C) the force exerted on the astronaut by Earth is equal to the gravitational force of the space station that is exerted on the astronaut; the two equal forces balance to cause the astronaut to float.
D) the force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut
Please help me with this question if you can ! It would be very much appreciated . Thank you
Answer:
The correct option is;
D) The force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut
Explanation:
According to Newton's third law of motion, in nature, for every action, there is an equal and opposite reaction, such that if a first object exerts a certain amount of force on a second object, the second object will exert a force of equal magnitude and opposite direction to that exerted by the first object
Therefore, the gravitational force exerted by Earth on the astronaut, is equal to the force exerted by the astronaut on Earth.
The claim from the options that is true about the force exerted on the astronaut by Earth is;
Option D; The force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut.
We are told that the astronaut experiences weightlessness in the space station. This is because he is moving around the earth under the influence of earth's gravitational force and is therefore in a state of 'free fall'.Now, the mass of the earth is much more larger than that of any astronaut. From newton's second law of motion, we know that;
Force(F) = Mass * Acceleration
Since the earth does not move but the astronaut moves, it means the force is sufficient to cause an acceleration of the astronaut but not sufficient to move the earth as the earth's mass is too big.Thus, the same force exerted on the astronaut by the earth is same exerted on the earth by the astronaut.
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Numa determinada escala X, arbitrária, um termômetro marca 0°X para o ponto de fusão do gelo e 50°X para o ponto de ebulição da água, ao nível do mar. Que temperatura esse termômetro marcaria se fosse mergulhado em um líquido cuja temperatura é de 50°C?
Answer:
the temperature measured by the thermometer is 25 ° X
Explanation:
The computation of the temperature measured by the thermometer is shown below:
Here is the thermometric scale list
(X - 0) ÷ C - 0 = (50 - 0) ÷ (100 - 0)
X ÷ C = 50 ÷100
X = C ÷ 2
Now if there is 50 degrees celcius
So, the x would be
= 50 ÷ 2
= 25 ° X
Hence, the temperature measured by the thermometer is 25 ° X
The same is to be considere d
Eli and Andy want to find out which of the two is stronger. Eli pushes a table with a force of 120 newtons while Andy pushes the table from the opposite side with a force of 125 newtons. Ignoring the masses of Eli and Andy, what is the resultant acceleration of the table if its mass is 10.0 kilograms?
A.
13.5 meters/second2
B.
0.50 meters/second2
C.
4.0 meters/second2
D.
5.50 meters/second2
E.
1.35 meters/seconds2
Answer:
B. 0.50 meters/second^2
Explanation:
Given:
mass of table (m) = 10.0 kgEli's force (F1) = 120 NAndy's force (F2) = -125 NArranging Formulas and Substituting Values, Part 1:
F = F1 + F2F = 120 + (-125)F = -5 NThe -5 means that the table will move along the direction of the force applied by Andy.Arranging Formulas and Substituting Values, Part 2:
m * a = Fa = F / Ma = -5 / 10.0 kga = -0.5 m/s^2Answer:
B. 0.50 meters/second^2
Explanation:
When it reacts with another element, an oxygen atom gains two electrons.
What is the resulting particle?
A. An ion with a negative charge
B. An ion with no charge
C. An isotope with no charge
D. An ion with a positive charge
Answer:
A
Explanation:
An ion with a negative charge
Answer:A
Explanation: