A stone of mass 3 kg attached an one end of a 2m long string is whirled
in horizontal circle. The string makes an angle of 45° with the vertical
then the centripetal force acting on the string is
(g = 10 m/s, tan 45º = 1
(A) 20 N
(B) BON
(C) 10 N
(D) 40 N
Answers
Answer:
If a is acceleration, v is velocity, x is position, and t is time, then which equation is notdimensionally correct?a. v = a/tA vehicle designed to operate on a drag strip accelerates from zero to 29 m/s while undergoinga straight line path displacement of 47 m. What is the vehicle's acceleration if its value may beassumed to be constant?c. 9 m/s2Jeff throws a ball straight up. For which situation is the vertical velocity zero?a. at the topA ball is thrown vertically upwards at 14.7 m/s. For its complete trip (up and back down to thestarting position), its average speed is:b. 7.35 m/s.A truck moves 60 m east, then moves 110 m west, and finally moves east again a distance of80 m. If east is chosen as the positive direction, what is the truck's resultant displacement?d. 30 mI walk five miles in a straight line in a direction north of east, and I end up three miles east andseveral miles north. How many degrees north of east have I walked?d. 53
°
A fireman, 51.1 m away from a burning building, directs a stream of water from a fire hose at anangle of 33.2
°
above the horizontal. If the initial speed of the stream is 48.9 m/s, at what heightwill the stream of water strike the building?c. 25.8 mVectors , , and have magnitudes 8, 11, and 21. When these vectors are added, what is theleast possible magnitude of their resultant?d. 40e. 2Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall(the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.07 kmaway from the tower, and the elevator falls from a height of 210 m, how long does Superguyhave to save Lois, and what must be his average speed?a. 6.55 s, 163 m/sWiley Coyote has missed the elusive road runner once again. This time, he leaves the edge ofthe cliff at 52.1 m/s horizontal velocity. If the canyon is 150 m deep, how far from his startingpoint at the edge of the cliff does the coyote land?e. 288 m
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