4. A cinder block is sitting on a platform 20 m high. It has a mass of 4 kg. The block has energy. Calculate it.
784 J
3136 J
847
80 J
Answer:
Explanation:
Since the block is at rest in an elevated position, we can assume that it only has potential energy.
U=mgh is the formula for potential energy where U=potential energy, m= mass, g=acceleration due to gravity, and h=height.
Plug in known variables....
U=4kg*9.8m/s^2*20m
U=784 joules of potential energy or letter A.
3.00 m3 of a fixed mass of a gas at 150 kPa. Calculate the pressure if the volume is reduced to 1.20 m3 at a constant temperature.
Answer:
P₂ = 375 kPa.
Explanation:
Given that,
Initial volume, V₁ = 3 m³
Initial pressure, P₁ = 150 kPa
Final volume, V₂ = 1.2 m³
We need to find the final pressure.
At constant temperature,
[tex]P\propto \dfrac{1}{V}\\\\P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{150\ kPa\times 3\ m^3}{1.2\ m^3}\\\\P_2=375\ kPa[/tex]
So, the new pressure is 375 kPa.
what is the momentum of a bicycle with a mass of 18 kg traveling at 20 m/s?
Answer:360 kg m/s
Explanation:Momentum refers to an object's quantity of motion.
Formula for Momentum: p=mv
p = refers to the momentum
m = refers to the object's mass (this is represented by the unit kg or kilogram)
v = this refers to the object's velocity (this is represented by the unit m/s or meter per second)
So, given that the bike has a mass of 18 kg and is traveling at 20 m/s, then you can already get the momentum by multiplying both of these values.
p = the bike's momentum (what is being asked here)
m = 18 kg
v = 20 m/s
Thus, p = 18kg × 20 m/s = 360 kg m/s
The bike's momentum is 360 kg m/s.
Brainlist please
How would the model change as the atom forms bonds? The third shell would have eight electrons after the atom gains seven electrons to fill the outermost shell. The third shell would be empty so that the eight electrons in the second level would be outermost after the atom loses one electron. The first and third shells would be empty so that the atom would have eight electrons in its remaining shell after the atom loses three electrons. The first shell would have two electrons and the second shell would have six electrons after the atom loses three electrons.
Answer:
The third shell would be empty, so the eight electrons on the second level would be the outermost after the atom lost one electron
Explanation:
When an atom is bonded with other atoms, a more stable configuration must be reached, which is why the energy of the molecule is less than the energy of the individual atoms, for this to happen in general, electrons are shared or lost and gained in each atom, depending on the electronegative of the same.
If we analyze an atom within the molecule, its last shell is full, in the case of atoms with few electrons in this shell, they are lost and in the case of many electors in this shell, it gains electrons to have eight (8) in total.
When reviewing the different answers, the correct one is:
* The third shell would be empty, so the eight electrons on the second level would be the outermost after the atom lost one electron
Answer: It’s B
Explanation:
Why do sex cells contain only half the number of chromosomes needed for offspring? Explain
Answer:
None, egg cells don't have chromosomes. No, sex cells do have chromosomes. Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomes–one homolog of each pair. This is the haploid number.
Una fuente luminosa de 75 W consume 75W de potencia electrica. Suponga que toda la energía se transforma en luz emitida de 600 nm de longitud de onda. a) Calcule la frecuencia de luz emitida b) ¿Cuántos fotones por segundo emite la fuente? C) ¿Son iguales las respuestas de de los incisos a) y b)?
Answer:
a) La frecuencia de la luz emitida es 5,0 × 10¹⁴ Hz
b) El número de fotones por segundo que emite la fuente es 2.26380924 × 10²⁰ fotones
c) Las respuestas del inciso a) yb) son diferentes
Explanation:
Los parámetros dados son;
La potencia de la fuente de luz, P = 75 W
La energía consumida cada segundo por la fuente de luz, E = 75 J
La longitud de onda de la luz emitida, λ = 600 nm
a) La relación entre la energía y la frecuencia de la luz se da a continuación;
υ = c/λ
E = n·h·υ
[tex]E = \dfrac{h \times c}{\lambda}[/tex]
Dónde;
E = La energía consumida por segundo = 75 J
h = constante de Planck ≈ 6.626 × 10⁻³⁴ J · s
υ = La frecuencia de la luz
λ = La longitud de onda de la luz = 600 nm
c = La velocidad de la luz, c = 3.0 × 10⁸ m / s
Por lo tanto, tenemos;
υ = c / λ = 3,0 × 10⁸ m / s / (600 nm) = 5,0 × 10¹⁴ Hz
∴ La frecuencia de la luz emitida, υ = 5.0 × 10¹⁴ Hz
b) El número de fotones por segundo que emite la fuente, 'n', se da como sigue;
n = E / (h · υ) = 75 J / (6.626 × 10⁻³⁴ J · s × 5.0 × 10¹⁴ Hz) = 2.26380924 × 10²⁰
El número de fotones por segundo que emite la fuente = n = 2.26380924 × 10²⁰ fotones
c) Las respuestas del inciso a) yb) son diferentes
5.0 × 10¹⁴ Hz ≠ 2.26380924 × 10²⁰ fotones.
A 0.225 kg sample of tin initially at 97.5°c is dropped into 0.115 kg of water. the initial temperature of the water is 10.0°c. if the specific heat capacity of tin is 230 j/kg • °c, what is the final equilibrium temperature of the tin-water mixture
Answer:
The final equilibrium temperature of the tin-water mixture is approximately 18.468 °C
Explanation:
The parameters of heat energy transfer from the tin to the water are given as follows;
The mass of the sample of tin, m₁ = 0.225 kg
The initial temperature of the tin, T₁ = 97.5 °C
The mass of the water into which the tin is dropped, m₂ = 0.115 kg
The initial temperature of the water, T₂ = 10.0 °C
The specific heat capacity of tin, c₁ = 230 J/(kg·°C)
The specific heat capacity of water, c₂ = 4,200 J/(kg·°C)
Let 'T' represent the final equilibrium temperature of the tin-water mixture, we have;
The heat lost by the tin, ΔQ[tex]_{tin}[/tex] = The heat gained by the water ΔQ[tex]_{water}[/tex]
∴ ΔQ[tex]_{tin}[/tex] = ΔQ[tex]_{water}[/tex]
Where;
ΔQ[tex]_{tin}[/tex] = m₁·c₁·(T₁ - T)
ΔQ[tex]_{water}[/tex] = m₂·c₂·(T - T₂)
By substitution, we have;
ΔQ[tex]_{tin}[/tex] = 0.225 kg × 230 J/(kg·°C) × (97.5°C - T)
ΔQ[tex]_{water}[/tex] = 0.115 kg × 4,200 J/(kg·°C) × (T - 10.0°C)
From ΔQ[tex]_{tin}[/tex] = ΔQ[tex]_{water}[/tex], we have;
0.225 kg × 230 J/(kg·°C) × (97.5°C - T) = 0.115 kg × 4,200 J/(kg·°C) × (T - 10.0°C)
∴ 5,045.625 J - 51.75 J/°C × T = 483 J/°C × T - 4,830 J
5,045.625 J + 4,830 J = 534.75 J/°C × T
∴ 534.75 J/°C × T = 9,875.625 J
T = 9,875.625 J/(534.75 J/°C) = 18.4677419 °C ≈ 18.468 °C
The final equilibrium temperature of the tin-water mixture, T ≈ 18.468 °C.
which type of light has the highest frequencies
what does it mean for a disease to be X linked?
Answer:
X-linked is a trait where a gene is located on the X chromosome. Humans and other mammals have two sex chromosomes, the X and the Y. In an X-linked or sex linked disease, it is usually males that are affected because they have a single copy of the X chromosome that carries the mutation.
The Sankey diagram below shows the energy transfers in a computer. 100 J of energy are input, it is carried to the computer by
What one word completes the sentence?
Answer:
electricity
Explanation:
A vector quantity is : A deer running 15 meters per second due west
Answer:
True.
Explanation:
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
[tex]Velocity = \frac{distance}{time}[/tex]
Simply stated, a vector quantity has both magnitude and direction.
Thus, a vector quantity is: A deer running 15 meters per second due west.
What is the gravitational force between the Earth and the Sun? The mass of the Earth is 5.972 x 1024 kg, the mass of the Sun is 1.99 x 1030 kg, and the
distance between the Earth and the Sun is 1.496 x 101 m.
5.295 x 1033N
9881N
O 3.54 x 1022N
5.11 x 1014 N
Calculate by how much a spring with spring constant 1.2N/m has been squashed when it has stored 76J,
Answer:
11.25 m
Explanation:
From the question given above, the following data were obtained:
Spring constant (K) = 1.2 N/m
Energy (E) = 76 J
Compression (e) =?
Energy stored in a spring is given by the following equation:
E = ½Ke²
Where:
E => Energy stored in the spring.
K => spring constant
e => Extention or compression
With the above formula, we can obtain how much the spring has been squashed as follow:
Spring constant (K) = 1.2 N/m
Energy (E) = 76 J
Compression (e) =?
E = ½Ke²
76 = ½ × 1.2 × e²
76 = 0.6 × e²
Divide both side by 0.6
e² = 76 / 0.6
Take the square root of both side.
e = √(76 / 0.6)
e = 11.25 m
Thus, the spring has been squashed by 11.25 m
Explain how sharpening a knife changes is MA (mechanical advantage).
Answer:
Sharpening a knife reduces it's height as a wedge thus giving it more efficiency.
Explanation:
Mechanical advantage refers to the degree or quantity to which a force is increased or amplified by using a tool or a machine.
Mechanical Advantage can be calculated as follows:
Lenght of Incline (LI) / Height of Incline (HI)
Assume I have constructed a hedge with an inclination that run 10 meters from point x to point y (which is the back of a truck. Point y to the floor is 5 meters.
If LI = 10m and
HI= 5m
The mechanical advantage is given as 10/5 = 2
The angle of incline is also called the effort distance. From our calculations above, by sacrificing horizontal movement, I reduced the amount of effort it would have cost to lift up that object from ground up - a distance of 5 meters.
Think of a knife as a form of a similar wedge.
The more a knife is sharpening of a knife further reduces its angle of elevation. Thats why it becomes more efficient to use, hence our mechanical advantage.
Cheers
How many electrons per second flow through a wire with a 12pA current?
AP physics Will give brainliest to correct answer.
Answer:
the 4th one
Explanation:
A 10 N force and a 55 N force act on an object in opposite directions. What is the net force on the object ?
Answer:
对不起，我不知道对不起
Explenation:
The net force acting on the body is 45 N
Force is a vector, vectors are quantities that have both magnitude and direction. We must take the direction of the vector into account when computing the net force.
Since the two forces act in opposite directions, the net force is; 55 N - 10 N = 45 N.
The direction of this force is towards the 55 N force which is the larger force.
Learn more: https://brainly.com/question/14685564
Identify the medium an electromagnetic wave travels the fastest in.
empty space or vaccum the Electro magnetic wave travels the fastest.
The temperature at which a liquid becomes a gas is the _____ point.
freezing
boiling
condensation
melting
Boiling!
Explanation:
this is when it evaporates
Can someone explain E=mc2
In FULL detail please
Einstein's Big Idea homepage. E = mc2. It's the world's most famous equation, but what does it really mean? "Energy equals mass times the speed of light squared." On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.
An object accelerates at 50 m/s/s with a force of 100 N. What is its mass?
Answer:
Explanation:
A change in an object’s motion—such as Xander speeding up on his scooter—is called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its acceleration will be, but the mass of the object also affects its acceleration. The smaller its mass is, the greater its acceleration for a given amount of force. Newton’s second law of motion summarizes these relationships. According to this law, the acceleration of an object equals the net force acting on it divided by its mass. This can be represented by the equation:
Acceleration=Netforce-Mass or a=F/m
Which term, when divided by volume, equals density?
A) Distance
B) Power
C) Mass
D) Weight
Answer:
C) Mass
Explanation:
The mass of an object divided by its volume equals the density.
Hope this helps!
The term when divided by volume, equals density is known as Mass. Thus, the correct option for this question is C.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
The formula for calculating the density is as follows:
Density = Mass/Volume.Therefore, the term when divided by volume equals density is known as Mass. Thus, the correct option for this question is C.
To learn more about Density, refer to the link:
https://brainly.com/question/1354972
#SPJ2
Help! Plssssss 30 points!
how do you find the net force of 225 N
Answer:
2.65
Explanation:
Its simple just find the newtons
can anyone help me with differentiate between radio waves and x rays . Please Tomorrow is my exams This is A Imporrant question according to teacher..And all he taught was There definition
search it or use answers, really helps!!
Answer:
The only difference between the two is that the frequency of X-rays is very much higher than radio waves. If, on the other hand, the radio waves or X-rays are propagating through a medium other than the vacuum, their speed will generally be less than c and will depend upon the specific properties of the medium.
Big sound is heard in bathroom than in a living room
Answer
That doesn't make any sense.
Explanation:
The law of conservation of momentum states that, if left alone, what happens to the total momentum of two interacting objects that make up a system? it increases over time it remains the same it eventually becomes zero changes based on how they collide
Answer:
it remains the same
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
Momentum = mass * velocity
The law of conservation of momentum states that the total linear momentum of any closed system would always remain constant with respect to time.
Hence, the law of conservation of momentum states that, if left alone, the total momentum of two interacting objects that make up a system remains the same.
This ultimately implies that, if two interacting objects exert forces only on each other, their total momentum will remain the same i.e it is conserved.
Answer:
it remaines the same :)
Explanation:
. Calculate the unbalanced force acting on a 0.50 kg toy rocket that accelerates at a constant rate with a velocity of 20 m/s (up) to 45 m/s (up) in 0.7 s.
Answer:
17.85N
Explanation:
Given data
m= 0.5kg
u= 20m/s
v= 45m/s
t= 0.7second
From
F= mΔv/t
substitute
F=0.5*(45-20)/0.7
F=0.5*25/0.7
F=12.5/0.7
F=17.85
Hence the force is 17.85N
How can you prove that air contains carbon dioxide?
Answer:
Limewater can be used to detect carbon dioxide. If carbon dioxide is bubbled through limewater then it turns from clear to cloudy/milky in colour. This is why limewater used in a simple respirometer can show that more carbon dioxide is present in exhaled air compared to inhaled air.
Explanation:
Answer:
Explanation:
Carbon dioxide (CO 2) is colorless and odorless, so you can't detect it through direct observation. You'll need to collect an air sample (or a CO 2 sample), then run one of several simple tests to identify the presence of the gas
What's the Difference Between Weather and Climate?what is the difference between weather and climate
Answer:
weather and climate are different.
weather is when conditions in the atmosphere remain for a short time period.
example: Today's weather is rainy but tomorrow's weather will be sunny.
climate is when the conditions in the atmosphere are daily for a extended period of time at a certain location.
example: The climate in South Korea during winter is cold but sunny.
Difference between Weather and Climate
Weather is the state of the atmosphere over an area at any point of time while climate is the sum total of weather conditions and variations over a large area for a long period of time.Weather conditions change frequently whereas climate does not change so frequently, it remains same year after year.Weather data are recorded at a specific time while climate is recorded for a longer period of time.Example of weather: dry weather, windy weather, etc. Example of climate: tropical monsoon climate, equatorial climate, etc.Note: The first three points are the main differences. The last one is the example.
Hope you could understand.
If you have any query, feel free to ask.