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exam1key - Name: _ PERM #: _ PHYSICS 6A-EXAM I V ERSION A...

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Seat: ___________________ PERM #: _____________________________ PHYSICS 6A-EXAM I – VERSION A 1. (5 points) The following conversion equivalents are given: 1 gal = 231 in 3 1 ft = 12 in 1 min = 60 s A pipe delivers water at the rate of 71 gal/min. The rate in ft 3 /s, is closest to: A) 0.12 B) 0.10 C) 0.16 D) 0.14 E) 0.13 Answer: C 2. (7 points) The components of vectors and are given as follows: A x = +9 B x = -4.4 A y = -6.5 B y = -4.3 The magnitude of the vector difference - , is closest to: A) 180 B) 5.1 C) 12 D) 14 E) 4.9 Answer: D 3. (7 points) A ball is projected upward at time t = 0.0 s, from a point on a roof 60 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 23.4 m/s. Consider all quantities as positive in the upward direction. At time t = 2.39 s, the velocity of the ball is closest to: A) 0 m/s B) +28 m/s C) +12 m/s D) -28 m/s E) -12 m/s Answer: A 4. (5 points) An object is dropped from rest into a pit, and accelerates due to gravity at roughly 10 m/s 2 . It hits the ground in 5 seconds. A rock is then dropped from rest into a second pit, and hits the ground in 10 seconds. How much deeper is the second pit, compared to the first pit? Neglect air resistance. A) three times deeper
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exam1key - Name: _ PERM #: _ PHYSICS 6A-EXAM I V ERSION A...

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