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In the first part of your trip, you drive 85 miles at an average speed of 56 miles/hour. In the second part of your trip, you drive 5 hours at an average speed of 55 miles/hour. What is average speed during your whole trip?
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Question 2 (2 points)
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You drop a stone into a 300 meter deep well. How long after you will hear the sound of hitting? Sound velocity is given 334 m/s.
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Question 3 (2 points)
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You throw a stone vertically upward from the roof of an 77 m tall building with a velocity of 42 m/s. How long after the stone will land the ground? [Assume g=10m/s2]
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Question 4 (2 points)
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3 forces 50 N, 64 N and 19 N are oriented with x axis with angles of 45 degree, 135 degree and 225 degree respectively. What is their resultant?
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Question 5 (2 points)
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A 18.0 kg box is being pulled on a frictional surface with 191 N force which is oriented at 68 Degree with the ground. The work done to move 15 meter is 483 J. Assuming g=10m/s2, calculate μk?
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Question 6 (2 points)
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At a constant velocity, you are pulling a 10 kg object with a force P. How much work is done by P to move 87 cm? Assume kinetic frictional coefficient = 0.15 .
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Question 7 (3 points)
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A mover is pushing a 20 kg safe along a 30 degree ramp with 160 N force. What is the acceleration?