4.
a 40 kg child and a 30 kg child want to balance themselves on a 4 meter, 50
kilogramn see-saw. where should the fulcrum be placed?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Ascientific blank must be testable and capable of being proven false?

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).