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You are designing a lathe motor, part of which consists of a uniform cylinder whose mass is 90 kg and whose radius is 0.40m that is mounted so that it turns without friction on its axis, which is fixed. The cylinder is driven by a belt that wraps around its perimeter and exerts a constant torque. At t=0, the cylinder's angular velocity is zero. At t=25 s, its angular speed is 500rev/min. (a) What is the magnitude of the cylinder's angular momentum at t=25sec? (b) At what rate is the angular momentum increasing? (c) What is the magnitude of the torque acting on the cylinder? (d) What is the magnitude of the frictional force acting on the rim of the cylinder?
a physics student throws a bowling ball straight up into the air. the ball was in the air for a total of 8.44 seconeds
A 0.030 kg lead bullet hits a steel plate, both initially at 20?C. The bullet melts and splatters on impact. How much heat is required to increase the temperature of the lead bullet and melt it
A grinding wheel is in the form of a uniform solid disk of radius 6.90 cm and mass 1.90 kg, how many revolutions does it turn while accelerating
A tall tree is growing across a river from you. You would like to know the distance between yourself and the tree, as well as its height, but are unable to make the measurements directly. How tall is the tree
A rocket is launched from rest with an acceleration of 30m/s^2 for the duration of one second when it runs out of fuel. What is the max height of the rocket
A car crashes into a wall at 25 m/s and is brought to rest in 0.1s. Calculate the average force exerted on a 75-kg test dummy by the air bags
question a cubical box of widths lx ly lz l 4.82 nm contains eight electrons. what is the energy of the ground
Two boxes, A and B, are connected by a (mass-less) cord and are resting on a smooth (frictionless) table. Find the tension force in the cord connecting the two boxes
an electron is accelerated by a constant electric field of magnitude 300nc.a. find the acceleration of the electron.b.
An electric blanket is connected to a 120-V outlet and consumes 110 W of power. What is the resistance of the heater wire in the blanket
After hitting the wall, the ball is moving to the left at -28 i m/s. If the collision lasts .15s, what was the horizontal force exerted by the wall on the ball during impact
while walking between gates at an airport you notice a child running along a moving walkway. estimating that the child
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