A spaceship moving at relativistic speeds appears for an observer on earth as:

Shorter parallel to the direction of motion.

The amount of energy needed by a 1kg mass to change state.

Why is more energy used when you raise the temp of water from 75°C to 125°C than 15°C to 65°C?

Energy is required for the change of state.

How are space and time related?

Length increase balances with time dilation.

Happens through collisions between particles in a body.

What is the second law of thermodynamics?

Heat increases the energy of its surroundings when it moves.

Which of these is a postulate of relativity?

Laws of Physics are the same in all inertial systems.

Why can nothing exceed the speed of light?

No force in universe can accelerate an infinite mass past c.

Conductors have particles:

Close enough to collide with each other and feel cold.

A measure of chaos or disorder.

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Thermodynamics & Relativity

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Questions 20

Answers

1
How long does it take to heat 1.5kg of water from 20°C to 50°C? The c of water = 4180.
1.46 J/Kg°C
1.43 J/Kg°C
2520 W
1.43 W
2
A spaceship moving at relativistic speeds appears for an observer on earth as:
Longer perpendicular to the direction of motion.
Shorter perpendicular to the direction of motion.
Longer parallel to the direction of motion.
Shorter parallel to the direction of motion.
3
A hot drink weighs...
The same as a cold drink.
Has infinite mass.
Less than a cold drink.
More than a cold drink.
4
What is latent heat?
Sum of the kinetic energy of all the particles in a body.
Thermal energy moving from one body to another.
Proportional to average kinetic energy of particles in body.
The amount of energy needed by a 1kg mass to change state.
5
How fast do you have to travel to make it there in time?
0.66c
-0.66c
0.8c
1.5c
6
What is its specific heat?
3.0 °C
3.0 J/kg °C
8.4 x 10^6 J/kg °C
8.4 x 10^6 °C
7
Why is more energy used when you raise the temp of water from 75°C to 125°C than 15°C to 65°C?
It’s harder to raise the temperature of already hot water.
Increase in entropy.
Hot water has more mass.
Energy is required for the change of state.
8
What is its mass measured by an observer who is moving relative to the spaceship?
83 kg
50 kg
139 kg
112 kg
9
How are space and time related?
They are not related.
They are just friends.
Length increase balances with time dilation.
Mass increase balances with time dilation.
10
Conduction...
Is the sum of kinetic energy of all the particles in a body.
Is a transfer of energy through electromagnetic waves.
Happens through mass movement of molecules.
Happens through collisions between particles in a body.
11
What is the second law of thermodynamics?
Some energy moving between bodies is given to the universe.
All of the above.
Heat flows from a hot to cold body in contact.
Heat increases the energy of its surroundings when it moves.
12
Which of these is a postulate of relativity?
None of the above.
Both of the above.
Laws of Physics are the same in all non-inertial systems.
Laws of Physics are the same in all inertial systems.
13
You measure Superman is 136cm long as he flies past you at 0.7c. How tall is Superman at rest?
190 cm
220 cm
99 cm
136 cm
14
How fast is the rocket relative to the observer on Earth?
0.7c
0.9c
c
1.4c
15
What is special relativity?
A speed equal or bigger than 10% of the speed of light.
System that moves w/ acceleration relative to another system
None of the above.
The speed of one object relative to another object.
16
Why can nothing exceed the speed of light?
No force in universe can accelerate an infinite mass past c.
Because the velocity of light is constant.
Because nothing can reach the speed of light or exceed it.
You can exceed the speed of light.
17
Conductors have particles:
Far from each other and feel warm.
Far from each other and feel cold.
Close enough to collide with each other and feel cold.
Close enough to collide with each other and feel warm.
18
A spaceship passes at 0.750c and you measure the length as 47.5m. How long is the ship at rest?
31.4m
36.9m
29.2m
56.9m
19
What is entropy?
The amount of heat a body gives or receives.
The ratio between useful work and total work done.
A device that moves cold to hot.
A measure of chaos or disorder.
20
The amount of energy that raises the temperature of 1kg of a substance by 1 K is called...
Fusion
Standard heat capacity
Temperature
Specific heat capacity

Thermodynamics & Relativity Flashcards | StudBud