A 295 kg piano slides 4.3 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic friction is 0.40. A.) What is the force exerted by the man? B.) What is the work done by the man on the piano? C.) What is the work done by the friction force? D.)What is the work done b the force of gravity? E.) What is the net work done on the piano?5 AnswersPhysics1 decade ago
Police lieutenants, examining the scene of an accident involving two cars, measure the skid marks of one of the cars, which nearly came to a stop before colliding,to be 83 m long. The coefficient of kinetic friction between rubber and the pavement is about 0.90. Estimate the intial speed of that car assuming a level road.
A 6510 kg helicopter accelerates upward at 0.61 m/s^2 while lifting a 1190 kg frame at a construction site. What is the lift force exerted by the air on the helicopter rotors? What is the tension in the cable (ignore mass) that connects the frame to the helicopter? and What force does the cable exert on the helicopter?
A particular race car can cover a quarter mile in 6.8 seconds, starting from a standstill. If acceleration is constant how many g's does the driver experience? If the combinded mass of the driver and race car is 455 kg what is the horizontal force exerted on the tires? in N