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A 48 kg bear slides, from rest, 9.7 m down a lodgepole pine tree, moving with a speed of 5.8 m/s just before hitting the ground.
(a) What change occurs in the gravitational potential energy of the bear-Earth system during the slide?
(b) What is the kinetic energy of the bear just before hitting the ground?
(c) What is the average frictional force that acts on the sliding bear?
Suppose one gallon of gasoline produces 1.1 × 108 J of energy, and this energy is sufficient to operate a car for twenty miles. how many miles could the car go with that energy
A 59.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.714, What horizontal pushing force is required to just start the crate moving
A total of 2.99·106 electrons are placed on an initially uncharged wire of length 2.25 m. What is the magnitude of the acceleration of a proton placed at that point in space
Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that..
Compute the momentum of the bullet
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2πJ • s. Fuzzy has a mass of 2.00 kg and is at first known to be within a pond 1.00 m wide.
the velocity of an airplane is 50km/hr due north. the plane the plane flies into a cross wind of 50km/hr due east at a right angle
A long, straight wire carries a current of 48.9 A. The magnetic field produced by this current at a certain point is 7.80E-5 T. How far is the point from the wire
Suppose that a 1.00 cm3 box in the shape of a cube is perfectly evacuated, except for a single particle of mass 1.19 multiply.gif 10-3 g. Find the temperature inside the box
A motorboat is pointed due south, and its motor gives the boat a constant speed of 5.00 m/s through still water. Find the magnitude and direction of the boat's total velocity
The front 1.20 m of a 1600 kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision.
A merry-go-round is spinning and has a period of 7.25 s. A boy jumps off in a direction parallel to the radius, what is the new period of the merry-go-round
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