15. For the same rookdescribed above In question 14, calculate the magnitude and angle of
the rock 5 velocity vector after 3 seconds of free fall. Again, neglect air resistance.
its >< vwb H3
A) 100 m/s, 10 below the horizontal UW Pram OMS Md 04 l
Questions 1 - 5 will refer to this diagram and description. At a carnival, a stunt-woman is seated
at a height h meters above a pool, as seen in the diagram. When she presses a button, her seat
drops and she begins falling toward the pool. At exactly the
Efufon In HMl' wtllk M=V;l: Jo; 4%
4. Assume that t is the tmejttakes for the ball to travel a horizontal distance of 10 m. Because
the ball machine is aimed properly, this also will be the time at which stunt woman catches it.
Which of the following is t
Consider the diagram below in answering the next few questions. A man wishes to row across a
river from New Jersey (NJ) to New York (NY). He can row 2 m/s in still water and the river is
owing at 1 m/s as shown. The distance straight across the river is 1
NAME 33 ll/Clb OH 3
Exam 1 Physics P201
Sept. 18, 2014
This is a closed book exam. You may use a handheld calculator.
You should use a #2 pencil.
You will need to show your picture ID when you turn in the
1) Do not open the e
11. Look at the diagrams below. Which gure shows 20 P?
following is TRUE? 1
A) The objects acceleration is _
positive at point 1. [\l o \ 3 all?
8 Th 't d fth b ct C
) emagniueo eOJe 5 7+ L1 V0 ch QUJV
acceleration is greatest
Exam 1 Formula Sheet:
Displacement: A x =x/7 x1
Average speed: ave speed = distance/time
Average velocity: V =1=xfx,
At rf- t,
Instantaneous velocity: v 2 lim it
A t -'0 A r
Average acceleration: a =_A_V= I V:
A t 1":
A) From when it is at point C to when it is at point D. Ma $+ OJCQ. U) 8 r
C)10toZOsec 4, [1 (905403 CUer Ts 10 -30 S00
D)15toZSsec A, 2-2 bok$
@20t0305ec a, 3A boXGS
7. In the graph above, it which point is acceleration most positive?
13. A bowling ball Is thrown Straight up in the air 7 meters. What is the acceleration of the
ball when it is 3.5 meters high on the upward part of its trajectory?
Om/sz A+ oJ 00 \/&( dwa
C) 19.6m/sz +5236 (+0 (8/ H41 ValdCda,
D) -29.4 m/s2
2. Which of the following the correct expression for the y-component of the tennis balls
initial velocity, V. ?
.1703]: 15* sin 30m %
B) voy - 15* c0530 0 45A
+[5m 3mg) 37
C) 170),: 15* tan 30 V 30
Dlvoy_ 9.8* 15*tan30
E)voy = -9.8* 15?*tan30
17. Look at the gure below. A car is moving toward the right at constant velocity, which we
take to be in the positive x direction. The driver puts on the brakes, reducing the speed to
another constant velocity. Which of the following velocity versus time
At what altitude above the Earth's surface would your weight be 1/4 of what it is at the
Earth's surface? (The radius of the Earth is 6371 km.)
Two masses are being pulled up a 30 degrees incline by a force F parallel to the incline.
A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30
degrees above the horizontal. What is the location of the projectile 3.0 seconds later?
(Take X to be horizontal and Y to be vertical.)
Y = 37.0
Two blocks of masses 20.0 kg and 8.00 kg are connected together by a light string and
rest on a frictionless level surface. Attached to the 8.00 kg mass is another light string
that a person uses to pull both blocks horizontally. If the two-block syst
Consider the situation below in answering questions 21 and 22. A boy wishes to row
across a river from New Jersey to New York. He can row at 2 m/s in still water and the
river is flowing at 1 m/s.
At what angle 4 with respect to the shore should h
10. An airplane is traveling at 600 km/hr at a heading that is 45 North of East. A tailwind of
150 km/hr blows from behind the plane, from a direction that is 30 North of West (see
figure above). Under these conditions, what is the velocity of
Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N,
are applied to an object. For which orientation of the forces is the magnitude of
the acceleration of the object the least?
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P201 Exam September 13, 2012
This is a closed book exam. You may use a handheld calculator and one sheet
of notes and formulas.
A ski jumper leaves the jump horizontally, as shown in the Figure. If his take-off
speed is 40.0 m/sec, how long does she travel before striking the 45 slope? (Hint:
How are x and y related when the skier hits the snow?)
The earth i
An object starts from rest and moves in a straight line with an acceleration of +2.0 m/s2
that lasts for 3.0 seconds. It then reduces its acceleration to +1.0 m/s2 that lasts for 5.0
additional seconds. The velocity 8.0 seconds after the start of the
The object in the diagram below has three forces applied to it. F1 is 20 N up, F2 is 30 N
down, and F3 is 25 N at an angle of 45o above the horizontal. The net force on the object
is, (horizontal to right = + X axis, vertical up= + Y axis)
a. net Fx =
The drag force of an object moving in air is given by F = bv 2 , where F is force in
Newtons and v is velocity in meters/second. The dimensions of the constant b are,
A car accelerates from rest to 67.0 m/s over a distance of 400.0 m
A 16 lb fish is weighed with two spring scales, each of negligible weight, as
shown here. Which statement is true?
An object is thrown vertically up into the air. Which of the following five graphs
represents y component of the velocity (v) of the obj
A stone is thrown at an angle of 30.0 above the horizontal from the top edge of a
cliff with an initial speed of 12.0 m/s. A stop watch measures the stones
trajectory time from top of cliff to bottom to be 5.60 s. What is the height of the
cliff? (g =
In this class we generally neglect air resistance but one can compute the size of
the force on an object due to such resistance under some circumstances. One
formula for such a force (called the drag force) is:
Fdrag = C v 2 A
where A is an area, is a
Find the tension in an elevator cable if the 1000 kg elevator it supports is
descending with an acceleration of 1.8 m/s2, downward.
A European sports car dealer claims that his product will accelerate at a constant
rate from rest to a s
A box with a weight of 50 N rests on a horizontal surface. A person pulls
horizontally on it with a force of 10 N and it does not move. To start it moving, a
second person pulls vertically upward on the box. If the coefficient of static
friction is 0.4
1. A small ball collides with a large ball. Which set of arrows best describes the contact force
that each exerts on the other?
(The left arrow refers to the force on the left, smaller ball.)
Two masses are connected by a string which pa
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1) Starting from city A, a car drives 300 miles east to city B, then 300 miles north to
city C, and finally 700 miles west to city D. What is the distance
A baseball is thrown by the centerfielder (from shoulder level) to home plate
where it is caught (on the fly at shoulder level) by the catcher. At what point
during the flight is the balls speed at a minimum? (Resistance is negligible.)