two of you have chosen different levels for y = 0 in this problem. Which of the
ID: 1621748 • Letter: T
Question
two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on? 1) skier's potential energy 2) skier's change in potential energy 3) skier's final kinetic energy Circle one option here: a) only 2 b) only 3 c) 1, 2, and 3 d) only 1 and 3 e) only 2 and 3 3. Susie raised a5 kg sack to a height of 2 m in 5 seconds. Amy raised a 4 kg cat to a height of 1 m in 2 seconds. Who produced more power? a. Susie b. Amy c. Both the same d. Not enough information to tell A 2 kg book lies on a horizontal table. You slide the book across the table through a displacement of 50 meters. How much work was done by normal force (F_N) during this process? a. Zero b. 1 Joule c. 9.8 Joules d. -9.8 Joules. A 2 kg crate rests on a horizontal surface with a kinetic friction coefficient mu k = 0.3 and a woman pulls on it with a 10 N force. Rank the situations shown below according to the magnitude of the normal force exerted by the surface on the crate, from greatest to smallest. a) 3, 2, 1 b) 1, 2, 3 c) 2, 1, 3 d) 3, 1, 2 e) 1, 3, 2 The work done by gravity during the descent of a projectile: A. is positive B. is negative C. is zero D. depends for its sign on the direction of the y axis E. depends for its sign on the direction of both the x and y axesExplanation / Answer
3)
power of Susie,
P1=m1*g*h1/t1=
P1=5*9.8*2/5
P1=19.6 W
and
power of Amy,
P2=m2*g*h2/t2
P2=4*9.8*1/2
P2=19.6 W
therefore correct optin is (C), both the same
4)
work done by the normal force is zero
correct option is (a)
because, there is no displacement along normal force direction
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