Question
9 and 10
questions
space station. Which statement is i accurate? 9, Consider an astronaut in the l 7. A car on the highway drivws through a dip in the road. The dip can be approximat by the lower part of a cirele with a radius 100.m What will be the apparent weight of a person sitting in the car, at the bot tom of the dip, if the person has a mass of 00.kg, and the car is moving with a speed of e(b) The astronaut is apparently weight- (c) The astronaut's apparent weight is e astronaut is weightless. Of 30. less. (a) S.8 x 10N (b) 72N (c) 1.9×103N (d) The astronaut's apparent weight is just a fraction of her actual weight, greater than her actual weight zero. (d) 1.7×10-N (e) None of the above (e) The above s luted that none of them make sense. on- For the following two questions c the same frictionless ice. The man pulls on mass of the sled be twice the mass of the sider: A man is standing on friction ice pulling on a string with length of r = 1.50m is being rotated horizontally about a central axis. What is the Tension in the string, if it is rope attached to a sled on rotating with a constant angular velocity the sled causing it to accelerat to a veloc- ity of 8.0 of 3.60s? ina time (a) 38.9.N, away from the center (b) 38.9N, towards the center man who has a mass of mm 66kg 10. What force must the man apply to the sled (c) 17.3N, away from the center to keep it moving at a constant velocity of 8.0 ? (d) 17.3N, towards the center (e) None of the above (a) 0.0N (b) 130N (c) 66N (d) None of the abobe CONTINUED
Explanation / Answer
weightless ness is a sensation , it is not reality.This sensation depends on contact force. when there is no contact force, we feel that sensation. Hence the answer is E
10) the body is not accelarated since it is moving with uniform velocity i.e a = 0
Hence the required force F = m.a = m(0) = 0 N
Answer is A
