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Chapter 8: Q94P (page 210)
The luxury liner Queen Elizabeth 2 has a diesel-electric power plant with a maximum power of92 MWat a cruising speed of 32.5 knots. What forward force is exerted on the ship at this speed?(1 knot = 1.852 km / h).
The forward force exerted on the ship at speed.
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Tarzan, who weighs 688 N , swings from a cliff at the end of a vine 18 m long (Figure). From the top of the cliff to the bottom of the swing, he descends by 3.2 m . The vine will break if the force on it exceeds 950 N . (a) Does the vine break? (b) If no, what is the greatest force on it during the swing? If yes, at what angle with the vertical does it break?
A60.0 kgcircus performer slides4.00 mdown a pole to the circus floor, starting from rest.
What is the kinetic energy of the performer as she reaches the floor if the frictional force on her from the pole (a) is negligible (she will be hurt) and (b) has a magnitude of 500 N ?
In Fig 8-33, a small block of mass can slide along the frictionless loop-the-loop, with loop radius . The block is released from rest at point P, at height above the bottom of the loop. How much work does the gravitational force do on the block as the block travels from point Pto a) point Q(b) the top of the loop?If the gravitational potential energy of the block鈥揈arth system is taken to be zero at the bottom of the loop, what is that potential energy when the block is (c) at point P (d) at point Q (e) at the top of the loop? (f) If, instead of merely being released, the block is given some initial speed downward alongthe track, do the answers to (a) through (e) increase, decrease, or remain the same?
You push a 2.0 kg block against a horizontal spring, compressing the spring by 15 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 75 cm from where you released it. The spring constant is 200N/m. What is the block-table coefficient of kinetic friction?
In Fig. 8-51, a block is sent sliding down a frictionless ramp. Its speeds at points A and B areand, respectively. Next, it is again sent sliding down the ramp, but this time its speed at point A is. What then is its speed at point B?
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