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Chapter 8: Q111P (page 211)
A 9.40 kgprojectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 68.0 kJduring the projectile’s ascent. How much higher would the projectile have gone were air drag negligible?
The height is h=738 m .
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A collie drags its bed box across a floor by applying a horizontal force of 8.0 N. The kinetic frictional force acting on the box has magnitude 5.0 N . As the box is dragged through 0.70 malong the way, what are (a) the work done by the collie’s applied force and (b) the increase in thermal energy of the bed and floor?
Conservative force acts on a particle that moves along an x axis. Figure 8-72 shows how the potential energy associated with force varies with the position of the particle, (a) Plot for the range . (b) The mechanical energy Eof the system is 4.0J. Plot the kinetic energy localid="1661232921223" of the particle directly on Fig. 8-72.
Figure shows a plot of potential energy Uversus position x.of a 0.200 kg particle that can travel only along an xaxis under the influence of a conservative force. The graph has these values: , , and . The particle is released at the point where Uforms a “potential hill” of “height” , with kinetic energy 4.00 J. What is the speed of the particle at: (a) x = 3.5 m (b) x= 6.5 m? What is the position of the turning point on (c) the right side (d) the left side?
The summit of Mount Everest is 8850 mabove sea level. (a) How much energy would a 90 kgclimber expand against the gravitational force on him in climbing to the summit from sea level? (b) How many candy bars, at 1.25 MJper bar, would supply an energy equivalent to this? Your answer should suggest that work done against the gravitational force is a very small part of the energy expended in climbing a mountain.
A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8 m. He begins to slide down the ice, with a negligible initial speed (Figure). Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?
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