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A person walks into a room and switches on the ceiling fan. The fan accelerates with constant angular acceleration for 15 s until it reaches its operating angular speed of 1.0 rotations/s after that its speed remains constant as long as the switch is "on". The person stays in the room for a short time; then , 5.5 minutes after turning the fan on, she switches it off again and leaves the room. The fan now decelerates with constant angular acceleration, taking 2.4 minutes to come to rest. What is the total number of revolutions made by the fan from the time it was turned on until the time it stopped?
An elastic conducting material is stretched into a circular loop of 16.1 cm radius. What emf is induced in volts in the loop at that instant
Two protons in an atomic nucleus are typically separated by adistance of 2.0*10-15 m. The electric repulsion force between theprotons is huge, but the attractive nuclear force is even strongerand keeps the nucleus from bursting apart. What is the m..
A ball of mass 0.40 kg moving at 180 m/s east strikes a second ball, initially at rest of mass 0.500 kg. What is the final velocity of the second ball
A child moves with a speed of 5.40 m/s when positioned 14.0 m from the center of a merry-go-round. Calculate the net force (in newtons) exerted on the child, whose mass is 26.0 kg
Suppose one gallon of gasoline produces 1.1 x 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 car travels along a straight line at a constant speed of 41.5 mi/h for a distance d and then another distance d in the same direction at another constant speed. What is the average speed for this new trip
a plane flying horizontally in a straight line over the ocean drops a monitoring buoy for a science experiment. explain
A beam of light is incident from air onto a flat piece ofpolystyrene at an angle of 52^{\circ} relative to a normal to the surface. What angle does the refracted ray make withthe plane of the surface?
three forces are applied to a bracket as shown. the directions of the two 30 n forces may vary but the angle between
For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil, What is the width of the slit
Two concentric current loops lie in the same plane. The smaller loop has a radius of 3.0 and a current of 12. What is the radius of the bigger loop
What is ratio of the applied force
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