11 | A car has a linear velocity v on a circular track of radius r. If its speed is increasing at a rate of a m/s2, then its resultant acceleration will be (a) (b) (c) (d) | |
12. | A car is moving in a circular track of radius 10 metre with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of 1 metre long. The angle made by the rod with the track is (a) zero (b) 30° (c) 45° (d) 60° | |
13 | A car is moving in horizontal circular track of radius 10 m, with a constant speed of 36 km/hour. A simple pendulum is suspended from the roof of the car. If the length of the simple pendulum is 1 m, what is the angle made by the string with the track? (a) 30° (b) 45° (c) 60° (d) 90° | |
14 | A car is moving on a circular path and takes a turn. If R1 and R2 are the reactions on the inner and outer wheels respectively, then (a) R1 = R2 (b) R1 < R2 (c) R1 > R2 (d) R1 ³ R2 | |
15 | A car is moving with a speed of 30 m/s on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s2. The acceleration of the car is (a) 9.8 m/s2 (b) 1.8 m/2 (c) 2 m/s2 (d) 2.7 m/s2 | |
15 | A car moving on a horizontal road may be thrown out of the road is taking a turn (a) by the gravitational force (b) due to the lack of proper centripetal force (c) due to the lack of frictional force between the tire and the road (d) due to the reaction of the ground | |
17 | A car of mass 1000 kg moves on a circular road with a speed of 20 m/s. Its direction changes by 90° after traveling 628 m on the road. The centripetal force acting on the car is (a) 500 N (b) 1000 N (c) 1500 N (d) 2000 N | |
18 | A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is (a) 7 m/s (b) 14 m/s (c) 8 m/s (d) 12 m/s | |
19 | A car sometimes overturns while taking a turn. When it overturns, it is (a) the inner wheel which leaves the ground first (b) the outer wheel which leaves the ground first (c) both the wheel leave the ground simultaneously (d) either inner wheel or the outer wheel leaves the ground | |
20 | A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip? (a) 2 cm (b) 4 cm (c) 6 cm (d) 16 cm | |
Answer
11. Answer: A
12. Answer: C
13. Answer: B
14. Answer: B
15. Answer: D
16. Answer: C
17. Answer: B
18. Answer: B
19. Answer: A
20. Answer: A
