A 1.5 kg block sliding on a rough horizontal surface (coefficient of friction of 0.34) is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 0.20 m horizontally from the equilibrium position and released from rest, how fast is the block moving when it passes the equilibrium position for the first time?

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)