The energy needed the raise the temperature of the block of silver is given by:

where m is the mass of the block, Cs the specific heat capacity of silver and

its increase in temperature.
Using the numbers of the problem, we find
B. is coated on the inside with powder
Answer:
D) 11 m/s
Explanation:
We have to calculate the velocity of the hot dog with respect to the observer still outside the train. This velocity will be given by:

where
is the velocity of the train (towards right)
is the velocity of the man (towards right)
is the velocity of the hot-dog (towards left, so we put a negative sign)
By replacing the numbers into the equation, we find

and the positive sign means the velocity is toward right.