836-880Engineering Mechanics Dynamics.docx - Engineering...

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Engineering Mechanics Dynamics 836-880 Problem 836: What is the acceleration of a body that increases in velocity from 20m/s to 40 m/s in 3 seconds? A. 5.00 m/s 2 B. 6.67 m/s 2 * C. 7.00 m/s 2 D. 8.00 m/s 2 Problem 837: How far does an automobile move while its speed increase uniformly from 15kph to 45kph in 20 seconds? A. 185 m B. 167 m* C. 200 m D. 172 m Problem 838: A train passing point A at a speed of 72kph accelerates at 0.5 m/s 2 for one minute along a straight path then decelerates at 1.0m/s 2 . How far in km from point A will it be 2 minutes after passing point A? A. 3.60 km B. 4.65 km* C. 6.49 km D. 7.30 km Problem 839: From a speed of 75kph, a car decelerates at the rate of 500m/min 2 along a straight path. How far in meters will it travel in 45 seconds? A. 790.293 m B. 791.357 m C. 793.238 m D. 796.875 m* Problem 840: A train starting at initial velocity of 30kph travels a distance of 21 km in 18 minutes. Determine the acceleration of the train at this instant. A. 0.0043 m/s 2 B. 0.0206 m/s 2 * C. 0.0865 m/s 2
D. 0.3820 m/s 2 Problem 841: An auto mobile moving at a constant velocity of a 15m/sec passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 2 m/sec 2 . How soon the second automobile will overtakes the first? A. 15.3 sec B. 16.8 sec* C. 13.5 sec D. 18.6 sec Problem 842: If a particle position is given by the expression x (t) =3.4t 3 - 5.4t meters, what is the acceleration of the particle after t = 5 seconds? A. 1.02 m/s 2 B. 102 m/s 2 * C. 3.4 m/s 2 D. 18.1 m/s 2 Problem 843: The distance a body travels is a function of time and is given by x (t) = 18t + 9t 2 . Find its velocity at t=2. A. 36 B. 54* C. 24 D. 20 Problem 844: Determine the velocity of progress with the given equation: D = 20t + 5 t + 1 when t=4 seconds. A. 18.6 m/s B. 19.8 m/s* C. 21.2 m/s D. 22.4 m/s Problem 845: A ball is dropped from a building 100 m high. If the mass of the ball is 10 gm after what time will the ball strike the earth? A. 4.52s* B. 4.42s C. 5.61s
D. 2.45s Problem 846: A ball is dropped from the roof of a building 40 meters tall will hit ground with a velocity of: A. 50 m/sec B. 28 m/sec* C. 19.8 m/sec D. 30 m/sec Problem 847: Using a powerful air gun, a steel ball is shot vertically upwards with a velocity of 80 meter per second, followed by another shot after 5 seconds. Find the initial velocity of the second ball in order to meet the first ball 150 meters from the ground.

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