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Chapter 7: Q66P (page 175)
If a car of mass 1200kg is moving along a highway at 120 km/h, what is the car鈥檚 kinetic energy as determined by someone standing alongside the highway?
The car鈥檚 kinetic energy (K.E) as determined by someone standing alongside the highway is
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In Fig. 7-20 , a greased pig has a choice of three frictionless slides along which to slide to the ground. Rank the slides according to how much work the gravitational force does on the pig during the descent, greatest first
A luge and its rider, with a total mass of 85 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 37 m/s. If a force slows them to a stop at a constant rate of 2.0 m/s2, (a) what magnitude F is required for the force, (b) what distance d do they travel while slowing, and (c) what work W is done on them by the force? What are (d) f , (e) d , and (f) W if they, instead, slow at 4.0 m/s2 ?
If a Saturn V rocket with an Apollo spacecraft attached had a combined mass of and reached a speed of , how much kinetic energy would it then have?
In Fig. , a block of mass lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (spring constant ) whose other end is fixed. The block is initially at rest at the position where the spring is unstretched when a constant horizontal force in the positive direction of the x axis is applied to it. A plot of the resulting kinetic energy of the block versus its position x is shown in Fig.. The scale of the figure鈥檚 vertical axis is set by . (a) What is the magnitude of ? (b) What is the value of k?
A bead with mass is moving along a wire in the positive direction of an x axis. Beginning at time t=0, when the bead passes through x=0 with speed 12 m/s, a constant force acts on the bead. Figure 7-24 indicates the bead鈥檚 position at these four times: t0=0, t1=1.0 s, t2=2.0 s, and t3=3.0 s. The bead momentarily stops at t=3.0 s. What is the kinetic energy of the bead at t=10 s ?
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