4. Priyanshi Is Writing Some Statements But She is Confused To Know Whether The Statements Are Correct Or Not? Which answer do you think is correct?
[A] We cannot see anything through an opaque object.
[B] Those materials which do not allow any light to pass through them are called opaque
materials.
[C] If we cannot see through an object at all, it is not allowing any light to pass through it and

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?

There are 3 ways heat can be transferred: through solids, called , through liquids and gases , called , and through electromagnetic waves, called