You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up and the windows closed. You observe that the roof
A) bows inward.
B) is no different from when the car was at rest.
C) bows outward.
D) bows inward only when you are driving uphill.
E) bows inward only when you are driving downhill.
C
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Young's Modulus: A 7.0-kg pipe is hung from a steel wire that is 2.5 m long and has a diameter of 0.75 mm. Young's modulus for steel is 2.0 × 1011 N/m2.(a) By what distance does the wire stretch?(b) If the wire diameter were doubled, what would be the stretch?
What will be an ideal response?
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Answer the following statement true (T) or false (F)
Suppose you want to set up a simple pendulum with a period of 0.250 s
(a) What length is required if g = 9.80 m/s2 on Earth? (b) What length would be required on the moon assuming g is 6 (assume exact) times LESS than on Earth?
When a force acts on an object from an angle other than either 0° or 180° to the direction of motion:
a. the force is not in the direction of motion, so no work gets done. b. the force is perpendicular to the direction of motion, so no work gets done. c. the parallel and perpendicular component of the force both do work. d. the parallel vector component of the force does work but the perpendicular one does not. e. the perpendicular vector component of the force does work but the parallel one does not.