8. -12 points 4.P.022.Tutorial. My Notes Ask Your Teache A contestant in a winte

Question

8. -12 points 4.P.022.Tutorial. My Notes Ask Your Teache A contestant in a winter games event pushes a 31.0-kg rock across a frozen lake with a force of 25 N at 20° below the horizontal as shown in Figure (a) below, and it moves with an acceleration of 0.76 m/s2 to the right. (by (a) What is the normal force exerted by the lake surface on the rock? (b) Instead of pushing on the rock, the contestant now pulls on it witha rope over his shoulder at the same angle above the horizontal as in part (a). See Figure (b) above. Now what is the normal force exerted by the lake surface on the rock? Tutorial 9. /1 points Notes Ask Your Teache A chair of weight 130 N lies atop a horizontal floor. You push on the chair with a force of 40 N directed at an angle of 43 degrees below the horizontal and the chair slides along the floor. Find N, the magnitude of the normal force that the floor exerts on the chair. N=

Explanation / Answer

8. (a) Fnet _y = N - F sin20 - m g = 0

N = (25 sin20) + (31 x 9.8)

N =312.35 N  

(B) Fnet_y = N + F sin20 - m g = 0

N = (31 x9.8) - (25 sin20)

N = 295.25 N

9. N = (130) + (40 sin43) = 167.3 N

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