Question

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11 A man pulls 100-Norabe shown. 20" stope 5 m high M Assuming that the crate moves at constant speed, the work 100 N done by the man is 12, An escalator is used to move 20 people (60 kg each) per minute from the fest noor of a partment store to the second floor, 5 m 5 m power required approximatelyt above, The 13. A force on a particle is conservative ir: of the motion, not this the path between ts work depends on the endpoints b, it is not a in the kinetic energy of the particle its work equals change d it obeys Newton's second law it obeys Newton's third law 14. A proyectile of mass 0,so kg is fired with an intial speed of 10 ms at an angle of 60" above s the horizontal The potential energy of the projectle-Earth system hen the ProjectWe at wh highest point (relative to the potential energy when the projectle is at level) is: ground 10 J b, 18,75 J 20 15. A 25-g ball is released from rest 80 m above the of the Earth. During the fall the total thermal energy of the ball and air increases by15 J. ust before it hits the surface its speed is a, 19 b. 21 d, 25 J e, 27 U

Answer 1

here,

theta = 30 degree

force , F = 100 N

x = 5 m

the work done by the man , W = F * d

W = 100 * 5 = 500 J

the work done by the man is c. 500 J