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- Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 4.0 cm/year. (a) What distance does it move in 1 s at this speed? (b) What is its speed in kilometers per million years?5. A ball is dropped from a building 100 m high. If the mass of the ball is 10 grams, after what time will the ball strikes the ground? A. 5.61 s B. 2.45 s C. 4.52 s D. 4.42 s19. A stone is dropped from a height of 45 m. Approximately how long does it take to hit the ground? A. 40 s B. need to know the mass of the stone C. 25 s D. 3 s E. 400 s
- 11. A Honda city car is traveling at 54 km/h. If brakes are applied so as to produce uniform retardation of 3m/s². Calculate the time taken by it to stop.? a. 5sec b. 10sec С. 1sec d. None of these3. One newton is equivalent to: a) 1 kg · m/ s d) 1 kg / m b) 1 kg m/s? e) 1 kg m c) 1 kg - m² I s?21. An experiment consist of throwing ball straight up with varying initial velocities. Which quantity will have the same value in all trials? a. initial momentum b. maximum hieght c. Time travel d. acceleration 22. Compared to the inertia of a 1-kilogram mass, the inertia of a 4 kilograms mass is a. One-fourth as great c. 16 times as great b. One-sixteenth as great d. 4 times as great 23. As the mass of an object decreases, it's inertia will . As a. decrease b. remain the same c. Increase d. None of these 24. If the mass of a moving object could be doubled, the inertia of the object would be a. halved b. doubled c. unchanged d. quadrupled 25. The fundamental units for a force of 1 Newton are a. meter per second? b. kilograms c. meter per second? per kilogram d. kilogram meters per second ?
- 17. Starting from rest, the distance a freely-falling object will fall in 10 seconds is about 10 m 50 m 100 m 500 m none of these. a. b. C. d. e.A boxer moves into the punch so as to decrease the duration of impact by half,by how much will the force of impact be increased? A. increased by 4 times B. increased by 2 times C. increased by 3 times D. increased by 2.5 timesA mass of 10 grams is dropped from a building 100 meters high. After what time will the object hit the ground. Select one: a. 2.45 seconds b. 4.52 seconds c. 5.64 seconds d. 6.32 seconds
- 4. A change in the state of motion is evidence of a. a force b. an unbalanced force c. a force that has been worn out after an earlier application 5. From the equation F = ma, m is equal to a. a/F b. Fa c. F/a d. F-a 6. A Newton of force has what combination of units? a. kg-m/sec b. kg/m2 c. kg/m2/sec2 d. kg-m/sec22. A 10-g ball is dropped from a height of 1.5 m above the ground. If the collision time is 0.25 s when the ball hits the ground and assuming the ball bounces back up to a height of 60 cm, A. find the acceleration during the collision. B. find the force of collision. C. compare the force of collision with the weight of the ball.14. What will the spring scale read for a 55kg student in an elevator that moves upward with a constant speed of 6m/s? A. 520N B. 530N C. 540N D. 550N
