The diagram below shows Bob's foot. Bob is standing on his toes as shown. His foot bears one-half his weight. If Bob's mass is 85 kg, calculate the upward force exerted by the achilles tendon. (Show all your steps.)

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)

The strong nuclear force acts over a small distance than the electrostatic force. true or false

Why does a collision with an airbag cause less damage than a collision with a steering wheel