number 4,5 and 6 PHYS 120 who jumps in the air, 4. What is the force of friction
ID: 1790378 • Letter: N
Question
number 4,5 and 6
PHYS 120 who jumps in the air, 4. What is the force of friction on block A arth with a force of 884N. magnitude of the result--(a) ,ng, to the left (b) ,mAg, to the right (c) ngg, to the left (d) mBg, to the right of the Earth? E-vn a 5. What is the force of friction between block B and the Earth? rough empty space in a (a) mg, to the left h constant speed. It is far tional effects of any star or (b)zmBg, to the right hese conditions, the force plied to the rocket in order (c) guk (mA + ms), to the left tion is (d) guk (mx + ms), to the right weight. 6. Halivah is an inter-stellar space ship which nass. is 80m long. If this ship is started rotating about its center, what should be its angu- lar velocity so that at the tips of the ship the crew fell an acceleration of 1g? how fast it is moving. (a) 3.2s-1 o Figure 3 moves with a horizontal surface. (b) 20.s-1 it are shown. A fric- y the surface is the (c) 0.49s1 force on the block.(d) 0.358-1 luc " -(e) None of the abov ftward wing twoExplanation / Answer
6.
r = radius of circle = length/2 = 80/2 = 40 m
a = acceleration = 9.8 m/s2
w = angular velocity
centripetal acceleration is given as
a = rw2
9.8 = (40) w2
w = 0.49 rad/s
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