Midterm1A - PHYS 201 Print Name ID Number 950 Midterm Exam...

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Unformatted text preview: PHYS 201 Print Name ID Number 950 Midterm Exam I Signature Tutorial Section (day, time) 18 October 2006 Part I [30] 1. A projectile is shot from the edge of a vertical cliff with an initial speed of 38.0 m/s at an angle of 29.0 above the horizontal. The projectile hits the ground at a horizontal distance of 178 m from the base of the cliff. (a) Draw a sketch illustrating the problem and showing the path of the projectile and the directions you pick to be positive. [4] (b) Find the horizontal and vertical components of the shot's initial velocity. [6] (c) What is the projectile's velocity at its highest point above the ground? [4] (d) Find the time the projectile is in the air. [6] (e) Find the height of the cliff. [6] (f) What is the projectile's acceleration just before it hits the ground? [4] A-1 PHYS 201 Part II Midterm Exam I 18 October 2006 [70] 2. A 1250 kg car traveling to the right accelerates from 36 .0 km/h to 90.0 km/h in 4.50 s. Assuming constant acceleration, find (a) the acceleration of the car in SI units (m/s2 ), and (b) the net force on the car during the acceleration. Let right be the positive direction. [14] 3. A car travels 9.5 km due north and then 8.5 km due east over level ground. Find (a) the distance the car travels and (b) the magnitude of the car's displacement. [10] A-2 PHYS 201 Midterm Exam I 18 October 2006 4. The figure shows a velocity vs. time graph for a cart. (a) Is the initial velocity positive, negative, or zero? (b) Is the final velocity positive, negative, or zero? (c) Is the average acceleration positive, negative, or zero? (d) Label the point A on the graph where the acceleration is zero for an instant. (e) Label the point B on the graph where the cart stops for an instant and changes direction. [10] v 0 t 5. A baseball is thrown straight up with an initial speed of 22 m/s. It is caught at the same height it is thrown. (a) What are the velocity and acceleration of the ball at its highest point? [4] (b) What is the speed of the ball just before it is caught? [2] (c) Determine how high the ball goes. [8] A-3 PHYS 201 Midterm Exam I 18 October 2006 6. A 2.00 kg physics text is at rest on a level desk. The physics professor pushes down on the book with a force of 6.0 N. (a) Draw a free body diagram for the book. [3] (b) Find the weight of the book. [3] (c) Find the force with which the book pushes on the table. [5] (d) Describe the "reaction" force (Newton's third law) to the force of the table on the book by stating its magnitude, its direction, on what object it is exerted, and by what object it is exerted. [3] 7. For each of the following situations what can you conclude about the motion of the object? Explanations are not necessary. (a) The net force on a car is zero. (b) There is a net force on a bicycle in the direction opposite its velocity. (c) A book is initially at rest on a level table. A person then pushes horizontally on the book so that there is a net force to the left. (d) The magnitude of the force of air resistance on a falling ball equals the magnitude of its weight. [8] A-4 ...
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This test prep was uploaded on 04/18/2008 for the course PHYS 201 taught by Professor Jenkins during the Fall '08 term at University of Oregon.

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