An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 ms. what is the magnitude of this acceleration?

What is the length x of the side of the triangle below? (hint: use the cosine function)

Iwill give brainliest if you answer right : )

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.