Hello help me please The following parametric equations are :

x(t) = 2cosπt
y(t) = 2sinπt
z(t) = 0
Determine:

1) the modulus of the velocity vector at the instant t.
2) the modulus of the acceleration vector at any time "t'
3) The equation of the mobile and its trajectory.

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.