Physics 101 Exam 1 Zane 2008

# Physics 101 Exam 1 Zane 2008 - Multiple Choice choose the...

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Multiple Choice – choose the BEST answer to problems 1-15. 1. How many significant figures should be written in the product of 0.0078406 m with 9.45020 m? A) 3 B) 4 C) 5 D) 6 2. An equation for potential energy states U=mgH. If U is in kg m 2 s -2 , where m is mass, and g is the acceleration due to gravity, what are the units of H? 3. Density is the ratio of mass to volume. Mercury has a density of 1.36 x 10 4 kg/m 3 . What is the density of mercury in units of g/cm 3 . 4. The figure below shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the graph. ( )( ) ( )( ) ( )( ) ( )( ) ( )( ) ( )( ) 1 1 1 2 2 2 1 2 The displacement is the area under the curve: x 2s 4m / s 2s 2m / s 2s 2m / s 4s 2m / s 1s 2m / s 1s 2m / s 4m 4m 2m 8m 1m 1m 18m Δ = + + + + + - = + + + + - = 5. Car 1 starts moving from rest just as Car 2 crosses it. If Car 2 maintains a constant velocity of 20.0 m/s, and Car 1 a constant acceleration of 0.63m/s 2 , how long does it take Car 1 to catch up with Car 2? A) 32 s B) 63 s C) 79 s D) 96 s E) 106 s.

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( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 2 2 2 2 2 2 1 1 1 1 01 01 1 2 2 2 2 1 2 02 02 2 2 2 2 1 2 2 2 1 2 2 2 To "catch up" means x =x : x x v t a t 0 0 0.63m / s t 0.63m / s t x x v t a t 0 20m / s t 0 20m / s t 0.63m / s t 20m / s t 0.63m / s t 20m / s t 0 t 0.63m / s t 40m / s 0 40m / s t 0, t 63s 0.63m / s = + + = + + = = + + = + + = = - = - = = = =
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