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A carpenter carries his 8kg toolbox at constant speed up 2 flights of stairs, each 3m high, in one minute.
a) How much work did the carpenter do in carrying the toolbox up 2 flights?
b) By how much did the potential energy of the toolbox change?
c) What was the carpenter's power output in watts when he carried the toolbox up the 2 flights?
d) If in leaning over the railing, the carpenter's glasses fall off, what will be the velocity of the glasses just before they hit the landing one flight down?
A bicyclist of mass 75 kg ( including the bicycle) can coast down a 4.0 degree hill at a constant speed of 10 km/h. Pumping hard,the cyclist can descend the hill at a speed of 30 km/h.
In the Bohr model, the electron in H has a circular orbit. For an isolated atom, the only force on the electron is the strictly radial electrical force. Does this violates the uncertainty principle
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The Sun emits electromagnetic waves (including light) equally in all directions. At what rate does the Sun emit electromagnetic waves
A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is horizontal
A lightweight electric car is powered by ten 12-V batteries. At a speed of 70 km/h, the average frictional force is 1050 N. What must be the power of the electric motor if the car is to travel at a speed of 70 km/h
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A siren at rest has a frequency f0. Standing at a crosswalk, a student hears a frequency f' from the siren in an approaching police car. find the speed of the car
A 39.0-kg child swings in a swing supported by two chains, each 3.10 m long, Find the force exerted by the seat on the child at the lowest point
A person with mass of 70kg is climbing a ladder with a length of 6 m and the ladder has a mass of 20kg that leans against a smooth, What is the magnitude of the frictional force of the floor
A simple gaussmeter for measuring horizontal magnetic fields consists of a stiff 42 cm wire that hangs from a conducting pivot, What is the equilibrium angular displacement of the wire from vertical if the horizontal magnetic field is 0.04 T and the..
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