Name:
Section:
Physics 2130
Final Exam
May 2, 2012
Turn o your cell phone NOW, if you have one, and put it away. Please place your bags
and other unnecessary items on the ground. Be sure you are not sitting next to anyone else,
and are not sitting in one
Physics 2130 Final Exam Solutions
3
1.
B
The gure shows a car moving to the left, and slowing down.
Given the coordinate axes shown, the cars acceleration a could be
A) 2 m/s2 (x) B) 2 m/s2 (+) C) 2 m/s2 (y ) D) 2 m/s2 (+)
x
y
2. An elevator is moving upw
Quiz #10
1. Which pendulum has the larger frequency?
A) 1kg
B) 9kg
C) Both the same
y
2. This graph is the displacement of a(n) _ oscillator.
A) underdamped
B) overdamped C) forced
3. Given two sound waves in air, the one with higher frequency has
A) a lo
1. The change in momentum p of a ball is equal to the _ on it. Quiz #7
A) impulse acting
B) work done
C) weight placed
Two balls with the same mass and speed hit a wall. Ball A
sticks to the wall; ball B bounces off of it with the same speed.
2. Which one
Quiz #11
1. The gure shows a standing wave.
The arrow points to a
A) node B) antinode
2. Which shows the lowest-frequency standing wave in a
pipe which is open on the left and closed on the right?
A)
B)
C)
D)
3. If you move towards a speaker that is emitt
The gure shows two masses attached by a rigid rod, which is
spinning around the axis marked by the black dot.
1. Which ball has the larger speed v?
A
A) A
B) B
C) both the same
Quiz #9
2. Which ball has the larger angular speed ?
A) A
B) B
C) both the sam
Equilibrium
A 2kg solid, uniform ball of radius 0.1 m is released from rest at point A in the
figure below. Its center of gravity is 1.5 m above the ground. The ball rolls
without slipping to the bottom of an incline and back up to point B where it is
lau
Fluids
Fluids at Rest
l
l
The density, , is defined as:
In theory the density at a point is the limit for an
infinitesimal volume, but we assume a fluid sample is
large relative to atomic dimensions and has uniform
density. Then
l
Density is a scalar quan
Rolling
Consider an object with a circular cross section that rolls without
slipping along a surface.
This motion can be simplified if we treat it as a combination of
translational motion of the center of mass and rotation of the object
about the ce
Fluids
Fluids at Rest
What volume of helium (density = 0.179 kg/m3) has the same mass
as 5.0 m3 of nitrogen (density = 1.25 kg/m3)?
a) 35 m3
b) 27 m3
c) 7.0 m3
d) 3.5 m3
e) 0.72 m3
A yacht floats in a large
pool. Compare the water
pressure directly below
Chapter 10
Rotational Kinetic Energy and
Rotational Inertia
A ball rolls across the floor, and then starts up a
ramp as shown below. In what direction does the
angular velocity vector point when the ball is
rolling up the ramp?
A) Into the page
B) Out of
Fluids
Fluids in motion
Equation of continuity
l
l
Motion of real fluids is complicated and poorly
understood (e.g., turbulence)
We discuss motion of an ideal fluid
1. Steady flow: Laminar flow, the velocity of the
moving fluid at any fixed point does not
1. The gure shows a 2kg block and a
1kg block. Where is the center of mass?
A
B
C
D
2kg
E Quiz #8
1kg
2. A 10kg block moves at 10m/s to the right, and a 1kg block 10kg 10m/s
moves 1kg to the left. The center of mass of both blocks is
1m/s
A) moving to the
1. The gure shows a 2kg block and a
1kg block. Where is the center of mass?
A
B
C
D
E Quiz #8
BCAABC
2kg
1kg
2. A 10kg block moves at 10m/s to the right, and a 1kg block 10kg 10m/s
moves 1kg to the left. The center of mass of both blocks is
1m/s
A) moving
The gure shows two masses attached by a rigid rod, which is
spinning around the axis marked by the black dot.
1. Which ball has the larger speed v?
A
A) A
B) B
C) both the same
Quiz #9
BCABBA
2. Which ball has the larger angular speed ?
A) A
B) B
C) both
1. The change in momentum p of a ball is equal to the _ on it. Quiz #7
A) impulse acting
B) work done
C) weight placed
ABBCCA
Two balls with the same mass and speed hit a wall. Ball A
sticks to the wall; ball B bounces off of it with the same speed.
2. Wh
Quiz #11
BDABBC
1. The gure shows a standing wave.
The arrow points to a
A) node B) antinode
2. Which shows the lowest-frequency standing wave in a
pipe which is open on the left and closed on the right?
A)
B)
C)
D)
3. If you move towards a speaker that i
Quiz #10
CABBBC
1. Which pendulum has the larger frequency?
A) 1kg
B) 9kg
C) Both the same
y
2. This graph is the displacement of a(n) _ oscillator.
A) underdamped
B) overdamped C) forced
3. Given two sound waves in air, the one with higher frequency has
F1
1. In this gure, if I apply a force F1 to the left
side of the uid, the right side feels force F2.
A) a greater
B) the same
C) a smaller
2. The density of water is 1000 kg/m3.
The oating object in the picture has a density of
A) 100 kg/m3
B) 500 kg/m3
Name:
Section:
Physics 2130
Exam 3
April 3, 2012
Turn o your cell phone NOW, if you have one, and put it away. Please place your bags
and other unnecessary items on the ground. Be sure you are not sitting next to anyone else,
and are not sitting in one o
Physics 2130 Exam 3 Solutions
3
1.
A
If I apply a 2 N force to stretch a spring with
spring constant k = 20 N/m, by how much does the spring
stretch?
A) 0.1 m B) 10 m C) 40 m
k=20N/m
2N
If I am holding the block steady with my hand using a force of 2 N, t
F1
1. In this gure, if I apply a force F1 to the left
side of the uid, the right side feels force F2.
A) a greater
B) the same
C) a smaller
2. The density of water is 1000 kg/m3.
The oating object in the picture has a density of
A) 100 kg/m3
B) 500 kg/m3