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A flywheel in a motor is spinning at 530 rpm when a power failure suddenly occurs. The flywheel has mass 40.0kg and diameter 75.0cm . The power is off for 39.0 s , and during this time the flywheel slows down uniformly due to friction in its axle bearings. During the time the power is off, the flywheel makes 250 complete revolutions. At what rate is the flywheel spinning when the power comes back on? How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on, and how many revolutions would the wheel have made during this time?
Suppose an electron starting from rest is accelerated in a uniform electric field directed horizontally and having a magnitude of 3000N/C . The electric field covers a region of space 12.5cm wide.
The maximum speed of a 2.5-kg mass attached to a spring is 0.55 m/s, and the maximum force exerted on the mass is 11 N. What is the amplitude of motion for this mass
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
The work function for cesium, 1.81 eV, is much lower than the work function for other metals. What is the photoelectric cut-off wavelength? What is the maximum electron kinetic energy when cesium is illuminated with light of 512-nm wavelength?
A person doing a chin-up weighs 655 N exclusive of the arms. During first 15 cm of the lift, each arm exerts an upward force of 355N on the torso. If the upward movement starts from rest, what is the person's velocity at this point.
A jet airplane is in level flight. The mass of the airplane is m = 8890 kg. At what angle is the airplane banked
A particle's acceleration is described by the function ax =(10-t)m/s^2, where t is in s. At what time is the velocity again zero
Two bicycle tires are set rolling with the same initial speed of 3.50 m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 psi and goes a distance ..
A projectile is fired with an initial speed of 68.8 at an angle of 37.8 above the horizontal on a long flat firing range. Find out the maximum height reached by the projectile.
What is the total force on the bottom of a swimming pool (20m by 10m), if the pool has an average depth of 1.50 m
A person is performing a knee extension exercise with a 100 N weight acting at the ankle. What is the torque at the knee necessary to maintain a knee joint angle of -60q relative to the right horizontal passing through the knee joint
A person desires to reach a point that is 3.40 km from her present location and in a direction that is 350 north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she mi..
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