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Chapter 6: Q60P (page 138)
If a car generates 18 hp when traveling at a steady what must be the average force exerted on the car due to friction and air resistance?
The average force exerted on the car due to friction and air resistance is 508.64 N.
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You lift a heavy book from a table to a high shelf. List the forces on the book during this process, and state whether each is conservative or nonconservative.
Consider a force \(F{\bf{ = 80}}\;{\bf{N}}\) applied to a beam as shown in Fig. 8鈥�37. The length of the beam is \(l{\bf{ = 5}}{\bf{.0}}\;{\bf{m}}\) and \(\theta {\bf{ = 3}}{{\bf{7}}^{\bf{o}}}\), so that \(x{\bf{ = 3}}{\bf{.0}}\;{\bf{m}}\) and \(y{\bf{ = 4}}{\bf{.0}}\;{\bf{m}}\). Of the following expressions, which ones give the correct torque produced by the force around point P?
(a) 80 N.
(b) (80 N)(5.0 m).
(c) (80 N)(5.0 m)(sin 37掳).
(d) (80 N)(4.0 m).
(e) (80 N)(3.0 m).
(f) (48 N)(5.0 m).
(g) (48 N)(4.0 m)(sin 37掳).
FIGURE 8-37MisConceptual Question 5.
List some everyday forces that are not conservative, and explain why they aren鈥檛.
(e) None of the above.
Two blocks of mass\({m_{\rm{A}}}\)and\({m_{\rm{B}}}\), resting on a frictionless table, are connected by a stretched spring and then released (Fig. 7鈥�48). (a) Is there a net external force on the system before release? (b) Determine the ratio of their speeds,\({v_{\rm{A}}}/{v_{\rm{B}}}\)(c) What is the ratio of their kinetic energies? (d) Describe the motion of the CM of this system. Ignore mass of spring.
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