Jacob is working on his physics portfolio and stands on a 0.45 m high step. if jacob’s mass is 103 kg, what is his potential energy while on top of the step? givens unkowns equation substitute solve if you could fill this in i will medal and give you brainliest answer, really struggling with this and could use a hand if you don't mind : )

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

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.

70 give a real life example showing how sensory neurons work with the motor neurons