A man is sliding down a pole thru 2.5 meters as shown below. He starts from rest and lands with the speed of 3.1 m/s. Man’s mass is 85 kg.
a) Draw Free Body Diagram of the man sliding down the pole.
b) Find the Friction force exerted on the man by the pole. Use Newton’s 2nd Law of Motion to solve this problem.
c) Determine acceleration of the man sliding down the pole.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)