US Cutnel, Physics, 10e raci aesiremean INTRO TO PHYSICS (PHYS 207/208) PRINTER
ID: 1585811 • Letter: U
Question
US Cutnel, Physics, 10e raci aesiremean INTRO TO PHYSICS (PHYS 207/208) PRINTER VESONBACK NEXT Chapter 07, Problem 01 A 49.4-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.48 m/s. Her hands are in contact with the wall for 0.648 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the sign of your answer. Number Units the tolerance is +/-3% By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor SAVE FOR LATER Question Attempts: 0 of 15 used Points available only if you answer this question correctly in four attempts or less.Explanation / Answer
By Impulse-Momentum theorem:
impulse=momentum
F*t = m *dv
F * 0.648 = 49.4 * 2.48
F = (49.4 * 2.48)/0.648
= 189.06 N
She pushes against the wall, direction is normal to the wall
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