What would you like Dr. Hoffman to call
you?
Which of the following are good places to find
help with your physics homework?
(List all that apply.)
a)
b)
c)
d)
e)
f)
g)
h)
i)
Dr. Hoffman
Online physics forums
Oscar the Grouch
Houghton College students
Professional online tutor
Cramster.com
Purchase Textbook supplements
Dr. Rowley
CASA
After completing a particular physics
problem, you notice that your friend has a
different answer than you. Is it okay to
check an online forum to see who is
correct?
Is it possible for two objects to be in
thermal equilibrium if they are not in
contact with each other?
Ice cubes are emptied into a bowl of water and the
system comes to equilibrium. The temperature of
the liquid water:
1. is higher that that of the remaining ice.
2. is equal to that of the remaining ice.
3. is less than that of the remaining ice.
4. depends on the amount of ice remaining.
Two objects have been in a freezer for a long
time: one is made of metal and the other is
made of cardboard. Removing them, which feels
colder?
1. Both feel the same
2. The metal feels colder
3. The cardboard feels colder
From the previous question, which has the
lower temperature?
1. Both have the same temperature
2. The metal is at a lower temperature
3. The cardboard is at a lower temperature
Two objects, with different sizes, masses, and
temperatures, are placed in thermal contact. In
which direction does the energy travel?
1. Energy travels from the larger object to the
smaller object.
2. Energy travels from the object with more
mass to the one with less mass.
3. Energy travels from the object at higher
temperature to the object at lower
temperature.
To convert a temperature in degrees Celsius to a
temperature in Kelvin, the final temperature is
equal to:
1. T − 273.15
2. They are the same, numerically.
3. T + 273.15
When solving problems, it is best practice to use
the Fahrenheit scale since it is what we
(Americans) are most familiar with.
Consider the following pairs of materials. Which
pair represents two materials, one of which is
twice as hot as the other?
1. Boiling water at 100∘ 𝐶, a glass of water at
50∘ 𝐶
2. boiling water at 100∘ 𝐶 , frozen methane
at −50∘ 𝐶.
3. an ice cube at −20∘ 𝐶, flames from a circus
fire-eater at 233∘ 𝐶
4. none of those pairs
It used to be that thermometers were made of
mercury inside of a glass tube. Based on the
operation of these thermometers, which has the
larger coefficient of linear expansion?
1. Glass
2. Mercury
Plunge a sensitive mercury-in-glass thermometer
into hot water. The temperature reading will
1.rise slowly to its final value.
2.first drop for a moment, then rise to its final
value.
3.instantly change to match the temperature of
the water.
4.rise rapidly, overshooting the temperature of
the water, then slowly fall until the correct
value is obtained.
5.none of the above.
Consider the metal disc with a hole drilled in it
shown below. When heated,
1. the disc will expand and so will the hole.
2. the disc will expand, but the hole will remain
unchanged.
3. the disc will expand, but the hole will shrink.
4. the disc will remain unchanged, but the hole
will become enlarged.
5. none of the above.
A metal ball is barely able to pass through a
metal ring. When the temperature of the ball is
increased, however, it will not pass through the
ring. What would happen if the temperature of
the ring is increased instead of the ball? The size
of the hole:
1. Increases
2. Decreases
3. Stays the same
When an air-filled balloon is put in a
freezer and cooled, the balloon has
1. a pressure increase.
2. a pressure reduction.
3. a volume decrease.
4. a volume increase.
Two balloons that have the same weight and
volume contain equal amounts of helium.
One is rigid, and the other is free to expand
and contract as the outside pressure changes.
When released
1.the rigid balloon will rise higher.
2.the balloon that is free to expand and
contract will rise higher.
3.both balloons will rise to the same height.
Who would gain by having the natural gas
warmed before it passed through the meter?
1.You.
2.The gas company.
3.No one, since it doesn’t make any
difference.
A circular ring of iron has a tight-fitting iron bar
across its diameter. If the arrangement is put into
an oven and heated, will the ring be distorted?
A small gap is cut from a metal ring. If you were
to heat the ring, what happens to the size of the
gap?
1. Increases
2. Decreases
3. Stays the same
You are designing a thermostat switch using two
pieces of metal connected together as shown. As
the temperature increases, the metals should
come in contact with a button to turn off the
heat.
Fixed
Button
1
2
How should the metals’ coefficient of linear
expansion compare?
1) The design is fatally flawed…
2) 1 larger than that of 2
3) 2 larger than that of 1
In the ideal gas law, the temperature 𝑇 is in:
1. Degrees Fahrenheit
2. Degrees Celsius
3. Kelvin
Some picnickers stop at a convenience store to
buy some food, including bags of potato chips.
They then drive into the mountains to their
picnic site. When they unload their food, what
will have happened to size of the bags of chips:
1. Increase
2. Decrease
3. Stay the same
A common material for cushioning objects in
packages is made by trapping bubbles of air
between sheets of plastic. Is this material more
effective at keeping the contents of the package
from moving around inside the package on
1. a hot day
2. a cold day
3. either hot or cold days
Quantitative (19.37):
A bicycle tire is inflated to a gauge pressure of
2.50 atm when the temperature is 15∘ 𝐶. While
a man rides the bicycle, the temperature of the
tire rises to 45∘ 𝐶. Assuming the volume of the
tire does not change, find the gauge pressure in
the tire at the higher temperature.