Determine the equation of motion if the spring constant is 8 lb/ft and if the weight is released 15 inches above the equilibrium with a downward velocity of 18 inches/s. (a) (t)= preview (b) find the amplitude: preview (c) find the first time that the mass attains its extreme displacement: preview seconds (d) find the first time that the object is at its equilibrium position: seconds preview ft (d) find the velocity of the object when it's its equilibrium for the first time

True or false graphs must include scales that increase by the same amount

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).