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To start a lawn mower, you must pull on a rope wound around the perimeter of a flywheel. After you pull the rope for 0.99 s, the flywheel is rotating at 3.6 revolutions per second, at which point the rope disengages. This attempt at starting the mower does not work, however, and the flywheel slows, coming to rest 0.24 s after the disengagement. Assume constant acceleration during both spin up and spin down.
(a) Determine the average angular acceleration during the 0.99-s spin-up and again during the 0.24-s spin-down.
(b) What is the maximum angular speed reached by the flywheel?
(c) Determine the ratio of the number of revolutions made during spin-up to the number made during spin-down.
The tension at which a fishing line snaps is commonly called the line's "strength." Find what minimum strength is needed for a line that is to stop a salmon of weight 85 Newton in 8.9 centimeter
Two moles of carbonmonoxide (CO) start at a pressureof 1.2 atm and a volume of 30 litres. The gas is then compressed adiabatically to this volume, What is the change in internal energy
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A skier starts from rest at the top of a hill that is inclined at 12.0° with the horizontal. The hillside is 180.0 m long, and the coefficient of friction between the snow and the skis is 0.0750. At the bottom of the hill, the snow is level and the c..
You are traveling on an airplane. The velocity of the plane with respect to the air is 130.0 m/s due east. What is the speed of the plane with respect to the ground
Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. How far away is the planet Venus if the echo time is 1500 s
it has been suggested that rotating cylinders about 12 mi long and 4.6 mi in diameter be placed in space and used as
A bullet with a mass of 65 g is shot horizontally and collides with a 1.25 kg wooden block initially at rest. evaluate what was the original speed of the bullet
A spaceship travels at constant velocity from Earth to a point 780 ly away as measured in Earth's rest frame, How old is the passenger when the ship reaches its destination, as measured by the ship's clock
the record distance in the sport of throwing cowpats is 81.1 m. assuming the initial launch angle was 45deg and
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