CP A thin, light wire is wrapped around the rim of a wheel ( Fig. E9.45 ). The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius R = 0.280 m. An object of mass m = 4.20 kg is suspended from the free end of the wire. The system is released from rest and the suspended object descends with constant acceleration. If the suspended object moves downward a distance of 3.00 m in 2.00 s, what is the mass of the wheel? Figure E9.45
CP A thin, light wire is wrapped around the rim of a wheel ( Fig. E9.45 ). The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius R = 0.280 m. An object of mass m = 4.20 kg is suspended from the free end of the wire. The system is released from rest and the suspended object descends with constant acceleration. If the suspended object moves downward a distance of 3.00 m in 2.00 s, what is the mass of the wheel? Figure E9.45
CP A thin, light wire is wrapped around the rim of a wheel (Fig. E9.45). The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius R = 0.280 m. An object of mass m = 4.20 kg is suspended from the free end of the wire. The system is released from rest and the suspended object descends with constant acceleration. If the suspended object moves downward a distance of 3.00 m in 2.00 s, what is the mass of the wheel?
A thin, light wire is wrapped around the rim of a wheel. The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius 0.290 m. An object of mass 4.05 kg is suspended from the free end of the wire. The system is released from rest and the suspended object descends with constant acceleration.
If the suspended object moves downward a distance of 3.40 m in 2.15 s, what is the mass of the wheel?
A bicycle wheel is mounted on a fixed, frictionless axle, with a light string wound around its rim. The wheel has moment of inertia I=kmr2I=kmr2, where mm is its mass, rr is its radius, and kk is a dimensionless constant between zero and one. The wheel is rotating counterclockwise with angular speed ω0ω0 t=0t=0 someone starts pulling the string with a force of magnitude FF
A. Suppose that after a certain time tLtL LL ωfinalωfinal of the wheel?
Express your answer in terms of LL FF II ω0ω0
B. What is the instantaneous power PP delivered to the wheel via the force F⃗F→ at time t=0t=0?
Express the power in terms of some or all of the variables given in the problem introduction.
A customer service person in a department store is wrapping packages for customers. The ribbon spool she uses has 13.7 m of ribbon wound on it. The radius of the spool is 16.0 cm and its moment
of inertia is 0.35 kg · m2. As the spool turns, friction forces cause a torque of 0.19 N.m to act on it. The spool is initially at rest. The service person pulls on the spool with a constant tension of 9.5 N.
Determine the time it takes, in seconds, to unwind 6.5 m of the ribbon, assuming there is no slippage and the mass of the ribbon is negligible.
Chapter 9 Solutions
University Physics with Modern Physics (14th Edition)
Physics for Scientists and Engineers with Modern Physics
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