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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?
water at a pressure of 4.5 atm at street level flows into an office building at a speed of 0.7 ms through a pipe 5 cm
the speed of a bobsled is increasing because it has an acceleration of 2.3 ms2. at a given instant in time the forces
Forces of 11.9 N north, 19.7 N east, and 14.8 Nsouth are simultaneously applied to a 3.93 kg mass as it restson an air table. What is the magnitude of its acceleration?
q1. a 40 cm diameter vertical cylinder is sealed at the top by a frictionless 22 kg piston. the piston is 79 cm above
The drill bit of the variable-speed electric drill of radius 0.03 m has constant angular acceleration 2.5 rad/s^2. The initial angular speed of the bit is 4 rad/s. What is the angular speed after 4 seconds and angle has the bit turned through that ti..
A child's sled has rails that slide with little friction across the snow. Logan has an old wooden sled with heavy iron rails that has a mass of 8.0kg quite a bit for a 28kg child! Logan runs at 4.0m/s and leaps onto the stationary sled and holds o..
A distant galaxy is moving away from the earth with a speed that results in each wave- length received on the earth being shifted, Find the speed of the galaxy relative to the earth
a box full of books rests on a wooden floor. the normal force the floor exerts on the box is 235 n. a you push
a particle of mass 0.350 kg is attached to the 100 cm mark of a meter stick of mass 0.150 kg. the meter stick rotates
A train is traveling up a 3.3 incline at a speed of 3 when the last car breaks free and begins to coast without friction. How long does it take for the last car to come to rest momentarily? How far did the last car travel before momentarily coming..
A square coil, enclosing an area with sides 8.3 cm long, is wrapped with 2,545 turns of wire. What average voltage is induced in the coil
Phil is standing on a third floor balcony, 10m above the ground. Where does the ball hit the ground
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