Name: _____________________________ Class: ___________________
Phys 103 Final - Fall 2012 (95 points total)
Multiple Choice (2 points each)
Identify the choice that best completes the statement or answers the question.
____
____
1. For a block resting on a flat surface, the Normal force is equal to:
a. the frictional force
c. the work
b. the weight of the block
d. none of the above
2. Which of these forces provides the centripetal force for a ball being twirled in a circle?
a. the tension force
c. the normal force
b. the speed of the object
d. the gravitational force
3. What is the net torque acting on this board?
____
a. 4 Nm CCW
b. 0 Nm
4. Consider this graph. What is the x-intercept?
____
a.
b.
0
5
c.
d.
8 Nm CW
2 Nm CW
c.
d.
10
-2
1
Name: ________________________
____
5. A material with a higher specific heat...
a. is more dense than an object with lower
specific heat.
b.
has a bigger mass than materials with a
lower specific heat.
ID: A
c.
d.
requires more energy to raise its
temperature than for a material, of the
same mass, with a lower specific heat.
is warmer to the touch.
Short Answer
6. Practical Questions
(5 pts) Measure the length and diameter of the provided cylinder with the vernier caliper.
Length = _____________ cm
Diameter=______________ cm
7. (10 pts) Determine the mass of the aluminum cylinder with the provided materials. Assume all the clips
have equal mass. Draw a figure and/or show any data or calculations for full credit.
Mass of cylinder =______________g
.
8. (5 pts) What is the density of the cylinder?
Density = ___________ g/cm 3
.
2
Name: ________________________
ID: A
9. (5 pts) As we set up in lab, a cart of mass, m, is on an inclined plane of angle, θ . The cart is attached to a
sting, pulley and weight that apply a force, F, up the plane. Draw a force diagram or figure showing all the
forces on the cart if it is traveling UP the plane at a constant velocity. Label all forces.
.
10. (5 pts) For a cart on an inclined plane as above, the mass required to move the cart at a constant velocity up
the plane for a distance of 0.30 m is m u = 0.200 kg. What is the Work (W) done by the mass hanging on the
pulley on the cart?
.
3
Name: ________________________
ID: A
11. (10 pts) Draw the vector diagram (with resolved x and y vectors) and label the appropriate angle, θ, for a
ball traveling in a circular path.
Write the equations showing the sum of the forces in the x and y directions, ΣFx and ΣFy.
.
(5 pts) What are the period and radius of motion for this object traveling in a circular path? The
displacement versus time is graphed in this figure:
Simple Harmonic Motion (x vs. t)
4
Displacement (meters)
12.
3
2
1
0
-1
-2
-3
-4
0
1
2
3
4
5
6
7
8
9
time (seconds)
.
4
10
11
12
13
14
Name: ________________________
ID: A
13. (10 pts) Determine the spring constant, k, from the graph. The equation of the line is:
T2 = (4π2/k) (ml + mh +fms)
where ml is the mass of the load, m h is the mass of the hanger, and m s is the mass of the spring.
Period Squared, T 2 (s2)
1.2
1
0.8
0.6
0.4
0.2
0
0
0.05
0.1
0.15
0.2
0.25
Mass, m l + m h (kg)
.
14. (10 pts) You combine 50 g of copper shot initially at 100 °C with 100 g of water at 20°C. The final
equilibrium temperature is 30°C. The specific heat of water is 1 cal/(g °C). What is the specific heat, c, of
copper? Show your calculations.
.
5
Name: ________________________
ID: A
15. (20 pts) The following data were taken for the surface area of a sphere, which is represented by this
equation:
A = 4πr2
Plot the data (so that it is linear) on the graph paper and interpret it appropriately to determine the value
for π.
The actual value for π is 3.14. Compute the percent difference between your experimental value (from the
graph) and the actual value.
Show your calculations for full credit.
Area
(m2)
3
10
30
55
radius
(m)
0.5
1
1.5
2
.
Other
16. Equations:
Volume of a cylinder: (π/4) d2 l
Work: W = F s
Heat: Q = mc∆T
Hooke’s Law: F = -kx
6
ID: A
Phys 103 Final - Fall 2012 (95 points total)
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
ANS:
ANS:
ANS:
ANS:
ANS:
B
A
B
D
C
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
SHORT ANSWER
6. ANS:
.
PTS: 1
7. ANS:
.
PTS: 1
8. ANS:
.
PTS: 1
9. ANS:
.
PTS: 1
10. ANS:
W = F s,= mg s = 0.588N
PTS: 1
11. ANS:
.
PTS: 1
12. ANS:
T = 5, r = 3
PTS: 1
13. ANS:
Slope = 3.8, k=10.4
PTS: 1
1
ID: A
14. ANS:
c = 0.286
PTS: 1
15. ANS:
slope = 13.5, pi = 3.38, per diff = 7.6%
PTS: 1
OTHER
16. ANS:
.
PTS: 1
2