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Unformatted text preview: were the magnitude and direction of the initial angular velocity? a. 96 rad/s, direction P b. 24 rad/s, direction P c. 48 rad/s, direction Q d. 48 rad/s, direction P Q PHYS115 ‐ Spring 2013 7 Test 1 ‐ 4 March 2013 Question 17 – Which of a car’s devices can be used to cause a car to accelerate? ( = yes, = no) steering brake gas pedal wheel pedal a. b. PHYS115 ‐ Spring 2013 c. d. Question 18 – Why does an archer aim somewhat above her target? Why can’t she simply aim directly at the bull’s‐eye to hit it? a. otherwise she cannot see her target b. to increase the acceleration of the arrow because leaning back gives a (small) ramp force c. the arrow will fall in flight, so she must compensate for its loss of height d. to make the arrow hit the target with more speed Question 19 – One type of home coffee grinder has a small blade that rotates very rapidly and cuts the coffee beans into powder. Nothing prevents the coffee beans from moving. Why don’t the beans get out of the way when the blade begins to push on them? a. the blades are...
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This document was uploaded on 03/13/2014 for the course PHYSICS 115 at UNL.

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