An 80 kg person stands 0.75 m from the bottom of a ladder (i. e. d = 0.75 m). the ladder leans against a frictionless wall at a 60° angle. if the ladder is 50 kg and is 2.5 m long what is the friction due to the floor, in newtons, on the ladder?

the ladder in the previous problem had a person standing on it. assume this person climbs up so that he stands 2.0 m from the bottom of a ladder (i. e. d = 2.0 m). what is the force exerted by the wall, in newtons, on the ladder?

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.

Do you think you could give me the answers to #29?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force