PHYS 1A Fall -2007 quiz 1

# PHYS 1A Fall -2007 quiz 1 - Physics 1A-a Quiz 1 Oct 12 2007...

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Physics 1A-a Quiz # 1 Oct. 12, 2007 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s 2 .) A) 28 m B) 49 m C) 55 m D) 64 m E) 72 m 2) A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 150 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 55 o . How high is the fountain? A) 17 m B) 20 m C) 23 m D) 29 m E) 34 m 3) A cheetah can run approximately 100 km/hr and a gazelle at 80 km/hr. If both animals are running at full speed, with the gazelle 70 m ahead, how long before the cheetah hits its prey? A) 25.2 s B) 12.6 s C) 6.3 s D) 10.7 s

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