You use a 25-cm long wrench to remove the lug nuts on a car wheel, as shown in the illustration below. If
you pull up on the end of the wrench with a force of
2.0×1 0 2 N at an angle of 30°, what is the torque on
the wrench? (sin 30°= 0.5, cos 30° = 0.87)

If steel is more dense that lake water, why can a boat float

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Carbon 14 is a naturally occurring stable