review exam 1

# review exam 1 - Physics 105 Jones Answers are now at the...

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Physics 105 Review 1 Jones Spring, 2008 Answers are now at the end 1. I throw a ball directly up with an initial speed of 20 m/s. How high is the ball when its speed is 10 m/s? (a) 10m (b) 15m (c) 20m (d) 40m (e) 5m 2. I throw a ball off a vertical cliff with an initial speed of 25.0 m/s, horizontally. If the ball hits the ground 40.0 m from the base of the cliff, how high is the cliff? (a) 15.7 m (b) 12.5 m (c) 40.0 m (d) 71.4 m (e) 119 m 3. A baseball player hits a long fly ball. At some point while the ball is still in the air, the forces acting on the ball are (a) gravity, air resistance, and inertia (b) gravity, air resistance and the force of the hit (c) gravity and air resistance only (d) gravity, air resistance, inertia and the force of the hit (e) air resistance only 4. A block is at rest on a rough, inclined plane (see figure below). The coefficient of static friction is 0.6. If the plane is raised, at what angle θ (in degrees) will the block begin to slip? (a) 20 (b) 31 (c) 40 (d) 45 (e) 60 5. An Atwood’s machine consists of masses m 1 = 6 kg and m 2 = 8 kg, connected by a rope which passes over a frictionless, massless pulley. If mass m 2 starts at a height of 0.5 θ

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m above the floor, and m 1 starts out on the floor, what will be the speed of m 2 just before it hits the floor? The system starts out at rest. 0.5m (a) 1.2 m/s (b) 3.1 m/s (c) 1.8 m/s (d) 3.6 m/s (e) 0.7 m/s 6. A student stands on a bathroom scale in a stationary elevator. The scale reads 500N. As the elevator starts to move, the scale changes to 600N.
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## This test prep was uploaded on 04/07/2008 for the course PH 105 taught by Professor Stanjones during the Spring '08 term at Alabama.

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review exam 1 - Physics 105 Jones Answers are now at the...

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