At a wedding reception, you notice a child who looks like their mass is about 25 kg running across the dance floor then sliding on their knees until they stop. If the coefficient of kinetic friction between the child's pants and the floor is 0.15, what is the friction force acting on them as they slide?

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

How does the entropy of steam compare to the entropy of ice?

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).