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A 400kg baby grand piano is raised to the roof of a 100m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics. I know the answer is 44.27 but I need to see it done step by step.
A generator driven by a diesel engine that develops 12 hp delivers 28 A at 240 V. What is the efficiency of the generator
An 84 kg skier is being pulled by a boat with a force of 240 N causing the skier to accelerate at 1.4 m/s^2. Find out the drag force on the skier.
a point charge of -3 c is located at x 2 m y -2 m. a second point charge of 12 c is located at x 1 m y 1 m.a find
A rock is thrown vertically upward from ground level at time t = 0. At time t = 1.8 s it passes the top of a tall tower, What is the height of the tower
A box of 25cm by 25cm by 25cm is placed in water, when a rat is placed on top of the box the box goes down by 2cm. what is the weight of the rat
Which of the following will create a magnetic field? An ion that is slowing down from 500 km/h to 400 km/h. neutron that is speeding up from 1000 m/s to 1200 m/s.
A person wearing a seat belt can withstand an acceleration of -3.0 x 10^2 m/s^2. Explain how thick should barriers be to safely stop a car that hits a barrier at 110 km/h?
A heat pump with a cop of 1.8 supplies energy to a house at a rate of 75000 kJ/h. Determine the electric power drawn by the heat pump and the rate of heat removal from the outside air
A pendulum is made with a 4.0 kg mass suspended at the end of a thin rod. What is the length of the thin rod
A 1120-kg car with an initial velocity of 21.0 m/s eastward crashes into the back of a 3180 kg cargo van, How much kinetic energy is lost from the car-van system
A baseball thrown at an angle of 55.0?^\circ above the horizontal strikes a building 16.0m, Find the direction of the velocity of the baseball just before it strikes the building
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.6 m/s in 2.91 s. determine the distance he runs
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