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Physics quiz questions (Example)

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1. An elevator is moving upward with a speed of 5.8 m/s. 5.3 seconds later the elevator is still moving upward but its speed has increased to 19.4 m/s. What is the average acceleration in m/s2 of the elevator during the 5.3 s interval? Please round your answer to one decimal place. Change in velocity = final velocity - initial velocity = 19.4 - 5.8 m/s = 13. 6 m/s Average acceleration = 13.6/ 5.3 3 m/s2 = 2.6m/s2 2. At one particular moment a subway train is moving with a positive velocity and positive acceleration. Which of the following phrases best describes the motion of this train? Assume the front of the train is pointing in the positive x direction The train is moving faster as It makes a turn due south and continues to travel at 22 m/s. What is the change in velocity of the car? ΔV =√ ❑ ¿ 31.1127 31 m/s 45° south of west 11. A ball is thrown as a projectile at an angle of 300 with the horizontal. The initial velocity of the ball is 32 m/s. What are the maximum height (ymax) and the maximum horizontal distance (Range) of the ball respectively? 13 m;   90.5 m   T= v0(sin 30)/g = 32 (sin30)/9.8 1.4 Y (1.41)= 32 (sin 30) (1.41)- ½(9.8) (1.41)2 = 13m Range = x (t2) = V0 cos(?) t2 = 2 V0 cos(30) V0 sin(30 ) / g = V02 sin (30) / g = 1024 sin (2(30°)) / 9.8 = 90.49m [...]

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Subject Area: Physics

Document Type: Paraphrasing

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Words 275

Pages 1

Completed in 9 days

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02.11.2018

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