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Chapter 6: Q6-23Q (page 138)
Why is it easier to climb a mountain via a zigzag trail rather than to climb straight up?
It is easier to climb a mountain through a zigzag trail because less power is required in a zigzag path than a straight-up path.
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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.
A small rubber wheel is used to drive a large pottery wheel. The two wheels are mounted so that their circular edges touch. The small wheel has a radius of 2.0 cm and accelerates at the rate of\(7.2\;{\rm{rad/}}{{\rm{s}}^2}\), and it is in contact with the pottery wheel (radius 27.0 cm) without slipping. Calculate (a) the angular acceleration of the pottery wheel, and (b) the time it takes the pottery wheel to reach its required speed of 65 rpm.
In Fig. 6-31, water balloons are tossed from the roof of a building, all with the same speed but with different launch angles. Which one has the highest speed when it hits the ground? Ignore air resistance. Explain your answer.
Fig. 6-31 Problem 12
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