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Chapter 10: Q7Q (page 286)
Figure 10-25ais an overhead view of a horizontal bar that can pivot; two horizontal forces act on the bar, but it is stationary. If the angle between the bar and is now decreased from and the bar is still not to turn, should be made larger, made smaller, or left the same?
The force will increase.
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A wheel, essentially a thin hoop with radius, is rotating at. It must be brought to a stop in. (a) How much work must be done to stop it? (b) What is the required average power?
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of. Suppose that one such flywheel is a solid, uniform cylinder with a mass of 500kg and a radius of 1.0m. (a) What is the kinetic energy of the flywheel after charging? (b) If the truck uses an average power of 8.0kW, for how many minutes can it operate between chargings?
The wheel in Fig. Has eight equally spaced spokes and a radius of . It is mounted on a fixed axle and is spinning at . You want to shoot a long arrow parallel to this axle and through the wheel without hitting any of the spokes. Assume that the arrow and the spokes are very thin.
(a) What minimum speed must the arrow have?
(b) Does it matter where between the axle and rim of the wheel you aim? If so, what is the best location?
Starting from rest, a wheel has constant acceleration . During a certain role="math" localid="1660898447415" interval, it turns through. How much time did it take to reach that interval?
Our Sun is (light-years) from the center of our Milky Way galaxy and is moving in a circle around that center at a speed of . (a) How long does it take the Sun to make one revolution about the galactic center? (b) How many revolutions has the Sun completed since it was formed about years ago?
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