[2] (c) A helium-filled weather balloon is held at ground level. The volume of the balloon is 4800 mº.
The pressure of the helium is 98 kPa.
The balloon is released and rises to a height where the volume of the balloon is 7200 m
(i)
Calculate the new pressure of the helium. Assume that the temperature stays constant.
pressure =
[2]

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.