# Chapt_09 - University Physics (Prof. David Flory) Chapt_09...

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University Physics (Prof. David Flory) Chapt_09 Wednesday, October 24, 2007 Page 1 Name: __________________________ Date: _____________ 1. Vectors a G and b G each have magnitude L . When drawn with their tails at the same point, the angle between them is 30º. The value of ab G G is: A) zero B) L 2 C) 2 32 L / D) 2 L 2 E) none of these 2. A watt · second is a unit of: A) force B) power C) displacement D) speed E) energy 3. A 0.50-kg object moves on a horizontal frictionless circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. If it starts from rest, then at the end of one revolution the radial component of the force of the track on it is: A) 19 N B) 38 N C) 47 N D) 75 N E) 96 N 4. A 0.50-kg object moves in a horizontal circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. The work done by the external force as the mass makes one revolution is: A) 24 J B) 47 J C) 59 J D) 94 J E) 120 J Write the letter for the correct answer on the answer sheet. Write clearly.

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University Physics (Prof. David Flory) Chapt_09 Wednesday, October 24, 2007 Page 2 5. Three identical ideal springs (X,Y,Z) are arranged as shown. When a 4.0-kg block is hung on X, the block remains at rest when it is released with the spring elongated by 3.0 cm. When a 6.0-kg block is hung on Y, the block remains at rest when it is released with the spring elongated by: A) 2.0 cm B) 4.0 cm C) 4.5 cm D) 6.0 cm E) 9.0 cm 6.
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## This note was uploaded on 09/01/2011 for the course PHY 303 taught by Professor Erskine/tsoi during the Spring '08 term at University of Texas at Austin.

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Chapt_09 - University Physics (Prof. David Flory) Chapt_09...

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