Test 1A WITH KEY

A yesbutbecauseofyourinertiathisforcegraduallye

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Unformatted text preview: phill force does the conveyor belt exert on the sa nd? a. b. c. d. 3,300 N 59,000 N 9,800 N 610 N Question 6 – Which of the three balls is in the air for the long est time? Question 9 – As you jump across a small stream, does a horiz ontal force keep you moving forward? a. yes, but because of your inertia this force gradually e xpires b. yes, there is a horizontal force: your weight c. no, there is no horizontal force d. no, because your horizontal acceleration is constant Question 10 – Plumbers sometimes fit a length of PVC pipe o nto the end of a pipe wrench. cannon a. b. c. d. the one lauched at 20 the one lauched at 45 the one lauched at 60 this time is the same for all three balls Why? a. to increase the torque they can apply b. to increase the friction between their hand and the w rench handle c. to reach high and out of the way plumbing d. to reduce the torque on fragile fittings Question 7 – Which of the three balls hits the ground with th e greatest speed? a. b. c. d. the one lauched at 20 the one lauched at 45 the one lauched at 60 this speed is the same for all three balls u Question 11 – A projectile is thrown directly upward and cau ght again. At the top of its path … a. b. c. d. … its horizontal velocity changes … its vertical velocity is zero … its acceleration changes … it stops accelerating PHYS115 ‐ Spring 2013 5 Test 1 ‐ 4 March 2013 Question 12 – A gymnast jumps upward with an initial speed of 20 m/s. For this question, use g = 10 m/s2. She is in the air for a total time of … a. b. c. d. … 20 s … 10 s … 4 s … 2 s Question 13 – A wine glass gets tipped over to the right, as sh own. What is the direction of the gravitational torque that acts on it while it’s falling over? a. b. c. d. Question 14 – On the planet Mars, the acc...
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