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Unformatted text preview: NAME: Exam 1, Physics 141 $10 You may bring 1 4x6 index card with whatever you want written on it. I need your name on
each page of the exam SHOW YOUR
WORK! ! ! Useful Constants: Acceleration due to gravity (g) = 9.8 m/s2 cos(45)=sin(45)=0.7, cos(30)=sin(60)=0.866, cos(60)=sin(30)=0.5, cos(53)=sin(37)=0.6,
cos(3 7)=sin(53)=0.8 1 mile = 1600 m Write and sign the honor pledge here: I pledge on my honor that I have not given or
received any unauthorized assistance on this assignment/examination. Exam 1: PHYSl41 SlO NAME: Question 1 A driver is driving at a constant speed of 10 miles per hour. He steps
on the gas and 10 seconds later his speed is 60 miles per hour.
What was the magnitude of his average acceleration, in meters per second squared (m/sz), averaged over the 10 s he was stepping on
the gas)? lAGEIz—(oOIC925CDMPW
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“0 arxlrhmdc error> lp+> Exam 1: PHYSl41 SlO NAME: Question 2 Two people are standing back to back to each other and both are at rest.
They both simultaneously start walking at constant speed, in opposite
directions. One walks at a speed of 1 m/s. The other walks at 2 m/s. If you
deﬁne t=0 to be the instant they start walking, at what time are they 10 m
apart? $7; ?\
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RHQMP’F‘ 1 Exam 1: PHYSl4l SlO NAME: Question 3 A person is standing on top of a building that is 10 m high. They reach
their arm over the edge of the building and throw a ball upward with a speed of 3 m/s. What is the speed of the ball when it hits the ground? gjm/S \r": €61+1Qo~a
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SC'im Exam 1:PHYSl41 SlO NAME: Question 4 A person is standing on a field. They see a dog at a distance of 3 m
from themselves at an angle of 45 degrees with respect to an axis
pointing to their right (counter clockwise, as usual). They see a cat
at a distance of 4 m at an angle of 180 degrees with respect to the
same axis. What is the magnitude of the distance between the dog
and the cat? ‘9
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(“\‘o CUM?bt\Qt\+> ? 03¢ ('0 Nut.)— ‘f'ﬂ M«’°\ coir—ed cums W 1 Exam 1: PHYSl41 SlO NAME: Question 5 A person standing on the top of a building that is 10 m high throws a
ball so that its initial velocity is 10 m/s with a direction parallel to the
ground and perpendicular to the face of the building. If the person
defines a coordinate system with their location as the origin (0,0)
position, the positive x axis in the direction of the throw and positive y
axis upward, what is the position of the ball when it hits the ground? quN L
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6kg)? corlLv‘\‘¥ (00“‘1 Li Exam 1: PHYSl41 SlO NAME: Question 6 A penny sits on a record, 6 cm from the record’s axis of rotation. The record spins at 2 revolutions per second. What is the acceleration of the penny?
Please remember that acceleration is a vector. Iv, 3 CWCUIL’C 1:. chcme at izier—eh’”)
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This note was uploaded on 09/08/2011 for the course PHYS 141 taught by Professor All during the Spring '08 term at Maryland.
 Spring '08
 ALL

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