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111exam2Solutions 1999

# 111exam2Solutions 1999 - Old Dominion University Fall 1999...

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Unformatted text preview: Old Dominion University Fall 1999 Physics 111N Introductory General Physics Professor C. Sukenik EXAM 2 Oct21, 1999 11:00 am — 12:15 pm Name: SSN: I will uphold the Honor Code. Signature: Instructions: 0 Read each question carefully. 0 Clearly mark your answers. 0 Show units for all answers. 0 Problems are weighted as indicated by the points in parentheses. - Use the back of pages for extra space if needed. 0 You may use a calculator. DO NOT share calculators. - You may use both sides of 1 sheet of 8 1/2” x 11” paper which contains your formulas and notes. Your formula sheet may NOT contain worked problems. 0 You will have 75 minutes to work on the exam. SHO W ALL WORK for partial credit. Score : Part 1—1 Part 2-1 Part 1—2 Part 2-2 Part 1-3 Part 2~3 Total Score Bold face type indicates a vector quantity. Part 1 (30 points total) (10 points) 1. Consider the vector shown in the ﬁgure. Calculate the x and y components of this vector. (10 points) 2. Calculate the force of friction, f, for a 5.0 kg box moving on a horizontal table with velocity +8 m/s. Take the kinetic coefﬁcient of friction to be uk = 0.23. v=8m/s Cl (10 points) 3. Calculate the work, W, done by gravity in the preceding problem, if the box moves 1.6 m along the table. Part 2 Problem 1 (30 points total) A stone is thrown upward from the top of a building at an angle of 300° to the horizontal and with an initial speed of 20.0 m/s. The height of the building is 45 m. (10 points) a) How long is the stone “in ﬂight”? (10 points) b) What is the speed of the stone just before it hits the ground? (10 points) 0) How far from the building does the stone hit the ground? Part 2 Problem 2 (20 points total) A car of mass m = 2000 kg is on an icy driveway. The driveway is inclined at an angle of 0 = 20° with respect to the horizontal. Neglect friction. (10 points) a) Determine the acceleration of the car down the driveway. (10 points) b) What is the normal force acting on the car? WWW Part 2 Problem 3 (20 points total) Use energy considerations to solve the following problem. A 3.00 kg crate slides down a ramp on a loading dock. The ramp is l m long, and inclined at an angle of 30°. The crate starts from rest at the top and slides down to the bottom. Assume that the frictional force between the crate and the ramp is a constant 5.00 N. (5 points) a) How much work has been done by the frictional force after the crate slides l m? (15 points) What is the speed of the crate when it reaches the bottom of the ramp? ...
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111exam2Solutions 1999 - Old Dominion University Fall 1999...

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