Show that on a roller coaster with a circular vertical loop (Fig. 8-43), the difference in your apparent weight at the top c the loop and the bottom of the loop is 6 g's-that is, six time your weight. Ignore friction. Show also that as long as you speed is above the minimum needed, this answer doesn't depend on the size of the loop or how fast you go through it. FIGURE 8-43 Problem 87.
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- Second QuestionA 60 kg skier starts from rest at height H = 20 m above the end of a ski-jump ramp (Fig. 8-37) and leaves the ramp at angle 9=28°. Neglect the effects of air resistance and assume the ramp is frictionless. (a) What is the maximum heighth of his jump above the end of the ramp? (b) If he increased his weight by putting on a backpack, would h then be greater, less, or the same? H End of ramp Figure 8-37 Problem 22.Disregarding friction, a roller coaster with a vertical drop of 46 m will achieve a speed of about 30 m/s. If the height of the drop is doubled, how much the speed is going to be?
- A box m=78kg is being pulled by a constant force F=106N at an angle of 21degrees the initial speed of the box is zero. What is the speed of the box at d=3.1m if the surface is frictionless?54 The only force acting on a 2.0 kg body as the body moves along an x axis varies as shown in Fig. 7-43. The scale of the figure’s vertical axis is set by Fs = 4.0 N. The velocity of the body at x = 0 is 4.0 m/s. (a) What is the kinetic energy of the body at x = 3.0 m? (b) At what value of x will the body have a kinetic energy of 8.0 J? (c) What is the maximum kinetic energy of the body between x = 0 and x = 5.0 m?A skier starts from rest and moves down on each of the inclines shown. In which case will the skier have the lowest speed at the bottom of the incline (A) if there is negligible friction and (B) if there is significant friction.
- I need help with this question8 In Fig. 8-25, a block slides along a track that descends through distance h. The track is frictionless except for the lower section. There the block slides to a stop in a certain distance D because of friction. (a) If we decrease h, will the block now slide to a stop in a distance that is greater than, less than, or equal to D? (b) If, instead, we increase the mass of the block, will the stopping distance now be greater than, less than, or equal to D? Figure 8-25 Question 8.In the figure below, a block of ice slides down a frictionless ramp at angle 0 = 50° while an ice worker pulls on the block (via a rope) with a force Fr that has a magnitude of 45 N and is directed up the ramp. As the block slides through distance d = 0.31 m along the ramp, its kinetic energy increases by 60 J. How much greater would its kinetic energy have been if the rope had not been attached to the block? ---Select--- F. A