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A cooling fan is turned off when it is running at 870rev/min . It turns 700 revolutions before it comes to a stop.
What was the fan's angular acceleration, assumed constant?
How long did it take the fan to come to a complete stop?
The tires of a car make 69 revolutions as the car reduces its speed uniformly from 92km/h to 40km/h . The tires have a diameter of 0.80m.
What was the angular acceleration of the tires?
If the car continues to decelerate at this rate, how much more time is required for it to stop?
Two cars of 2000 kg each collide head-on while traveling at 75.0 miles per hour. What is the temperature increase of the cars
A juniper wood plank measuring 7 ft by 0.6 ft by 0.3 ft is totally immersed in water. What is the net force acting on the plank
Boy is stands on a scale in an elevator that is accelerating upward. Scale reads 723.8 N. Find magnitude of the acceleration of the elevator
An X-ray photon scatters from a free electron at rest at an angle of 175 degree relative to incident direction. Find the kinetic energy of the recoil electron
The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. Find out the effective coefficient of kinetic friction between the wheel and the wet rag.
A bowling ball of mass 7.2 kg and a radius of 9.9 cm rolls without slipping down a lane at 2.8m/s. Calculate its total kinetic energy
A figure skater performs a triple twisting jump. She rotates around her vertical axis three times while she was in the air find the figure skaters average angular speed
A molecule of DNA (deoxyribonucleic acid) is 2.07 µm long. The ends of the molecule become singly ionized: negative on one end, Determine the effective spring constant of the molecule
A diverging lens (f = -10 cm) is located 20.0 cm to the left of a converging lens (f = 31.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, What is the height of the final image
A block of weight wt1 = 409 N sits on a frictionless table of mass 118 kg. The block is connected via frictionless pulley to a hanging block with weight wt2 = 172 N. FIND the tension in the rope connecting the two masses
Two ideal gases have the same mass density and the same absolute pressure. One of the gases is helium (He), and its temperature is 180 K. The other gas is neon (Ne). Illustrate what is the temperature of the neon?
A 246 kg wooden raft floats on a lake. When a 80kg man stands on the raft, it sinks 4cm deeper into the water. When he steps off, the raft vibrates for a while.
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