3 years ago

What are the postulates of STR?

1 answer:

6 0

Answer:

The laws of physics take the same form in all inertial frames of reference. As measured in any inertial frame of reference, light is always propagated in empty space with a definite velocity c that is independent of the state of motion of the emitting body.

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It is the thermal energy transferred from a hot object to a cold object.

kakasveta [241]

It is the thermal energy transferred from a hot object to a cool object.

The following statement listed above is correct.

Answer: True.

6 0

4 years ago

an object which has a mass of 70 kg is sitting on a cliff 10 m high calculate the objects gravitational potential energy given g

Alex73 [517]

GPE = mgh (for objects close to earth where g can be considered to be constant) Where m is the mass, g is the acceleration due to gravity (which the question has told us to assume is 10ms^-2), and h is the height of the object.

Substituting the values in:
GPE = 70*10*10 = 7000J

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3 years ago

Two skiers start at the same place at the top of the hill, and finish at the same place at the bottom. Skier A takes a straight,

Rus_ich [418]

Answer:A

Explanation:

Given

Skier A takes straight, smooth route while Skier B takes curvy, bumpy route to finish.

We know gravity is conservative in nature i.e. work done against it is independent of path followed

So work done by gravity for A and B is same

According to Work energy Theorem Change in the kinetic Energy is equal to work done by all the forces.

$W_g=\frac{1}{2}mv^2$