An aerobatic airplane pilot experiences
weightlessness as she passes over the top of
a loop-the-loop maneuver.
the acceleration of gravity is 9.8 m/s^2
if her speed is 440 m/s at this time, find the
radius of the loop.
answer in units of km.

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?

The energy released by a nuclear fusion reaction is produced when

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).