Physics 205 Sample Exam 1 - Winter 2002 - Prof. Philip E. Kaldon, Exams of Physics

Download Physics 205 Sample Exam 1 - Winter 2002 - Prof. Philip E. Kaldon and more Exams Physics in PDF only on Docsity! X1.1 205 PHYS-205(11) (Kaldon-27003) Name ______________________________________________ WMU-Fall 2002 Exam 0 - 100,000 points + 20,000
points Book Title ________This is for Topic 1, not your textbook!___ Sample – Not a Real Exam State Any Assumptions You Need To Make – Show All Work – Circle Any Final Answers Use Your Time Wisely – Work on What You Can – Be Sure to Write Down Equations Feel Free to Ask Any Questions
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2e Now This Car Really Moves! (25,000 points) 1.) In 1997-98, the land speed record is now set past Mach 1, the speed of sound (v = cs = 343 m/s) , using a jet powered car. (a) If the jet car starts at rest and accelerates at a = +2g, then how long (time) will it take for the car to reach v = 400. m/s ? (b) How far (distance) does the jet car travel from rest to the point where it reaches v = 400 m/s ? This can be done with or without the answer to (a) . Once the jet car reaches v = 400. m/s , you have to be very careful when trying to bring it to a stop – hit the brakes too hard and the car will flip out of control, not good at speeds above Mach 1! (c) If the jet car coasts at a constant speed for 10.0 seconds, how much distance will it travel during that time? (d) If the jet car is slowed down to stop over a distance of 15,000 meters, about 9.3 miles, what is the value of the acceleration of the jet car? (e) How much time does it take for the jet car to decelerate to a stop? This can be done with or without the answer to (d). Physics 205 / Sample Exam 1 Winter 2002 Page 2 Travel Into The Astounding Fifth Dimension (25,000 points) 2.) The motion of an object is determined the following equation. All of the other constants of integration, such as x0, are zero.
(a) Find the equation for the acceleration, a, of this object.
(b) Find the equation for the speed, v, of this object.
(c) Find the equation for the position, x, of this object. (d) A second object can be described by the following equation. Find the position of the second object at the time t = 5.00 sec. x t m m s m s m s m s m s( ) . . / . / . / . / . /
    500 500 500 500 500 5 002 2 3 3 4 4 5 5t t t t t
(e) Find the equation for the acceleration, a, of this second object, at the time t = 5.00 sec. d x dt m s 5 5 5500
. / Physics 205 / Sample Exam 1 Winter 2002 Page 3 The Bridges to Babylon Rock Concert (25,000 points) 3.) Three boys are standing on a bridge, 3.20 m above a river. They each hold a large rock. At the same time, they each do something with their rocks. Abe will toss his rock straight up at v0 = +6.70 m/s . Buck will simply release his rock with v0 = 0. Carl will throw his rock straight down at v0 = -6.70 m/s . In order to find out whose rock would hit the water first, and which rock is traveling the fastest, we would need the following information: (a) Find the time it takes for each rock to reach the water. (b) How high does Abe’s rock reach before it reaches its turning point? (c) With what velocity will Abe’s rock be moving at when it next passes by Abe’s hand? (d) Find the total distance each rock travels from the time they are released to the time they hit the water. (e) What is the acceleration of each rock from the time they are released to the time they hit the water? Physics 205 / Sample Exam 1 Winter 2002 Page 4 The Spoils Go To The Vectors! (25,000 points) 4.) One vector is described in standard form as
A = 3.21 m @ 167°. Another vector is described as
B = +4.32 m
i - 6.62 m
j . (a) Find the x- and y-components of the vector A. Find (b) the magnitude and (c) direction in form of the standard angle, of the vector B. (d) Find

A + B in standard form. (e) Find

A - B in standard form.