A force of 55.0 N is required to start a 4.75 kg box moving across a horizontal floor, A. What is the coefficient of static friction between the box and the floor? B. If the
55.0 N force continues, the box accelerates at 0.800 m/s, what is the coefficient of
kinetic friction?

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

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).

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked