PHY102 Week 3 | Computational Physics in Physics - Grand canyon university
Week 3
assignment
Fluid and Thermal Physics Exercises PHY-102: Fluid and Thermal Physics Exercises Complete the following exercises.
1. Rank the
following in terms of increasing density:
A. A100 g
object with a volume of 25 cubic centimeters
B. A 200 g
object with a volume of 100 cubic centimeters
C. A 100 g
object with a volume of 100 cubic centimeters
D. A 400 g
object with a volume of 50 cubic centimeters
2. Rank the
following in terms of increasing pressure:
A. A 10 kg
object distributed on a square surface with dimensions 10 cm by 10 cm
B. A 20 kg
object distributed on a square surface with dimensions 10 cm by 10 cm
C. A 30 kg
object distributed on a square surface with dimensions 20 cm by 20 cm
D. A 40 kg
object distributed on a square surface with dimensions 30 cm by 30 cm
3. Consider
four blocks with identical volumes placed in water as shown below. Which block has the smallest buoyant force on the water and why?
4. Consider
four blocks with identical volumes placed in water as shown below. Rank the blocks in terms of increasing
density:
5. Consider
a tall container filled with water. There are three holes of equal size in the side of the container as shown on the diagram below. The red arrows indicate the velocity of the water as it flows out of the holes. Why is the velocity larger for the bottom stream of water?
6. On a
quiet day, the atmospheric pressure results in a force of about 10,0000 N on a window pane with an area of 1 square meter. a. Why does this large force not shatter the window? b. How will this change if a strong wind is blowing across the window pane?
7. Explain
why locations near a large body of water generally have higher average temperatures in the winter and lower average temperatures in the summer.
8. A mirror
cleaned with an alcohol solution is slightly colder right after it is cleaned. Why?
9. To keep
the canned food from freezing in a storage cellar, a farmer places a tub of water in the cellar. Explain.
10. Why is it
safe to stick your tongue on a wooden pole on a cold winter day, but not on a metal pole?
11. You are in
the frozen food section of the grocery store and you notice that your hand gets cold when you place it on the glass windows of the display cases. Your friend says this is because coolness is transferred from the display case to your hand. What do you think?
12. Why are
good conductors of electricity usually also good conductors of heat?
13. Why is it
cooler to wear a white shirt than a black shirt on a hot, sunny day?
14. On a hot
day in your hot kitchen, you decide to work with the refrigerator door open in an attempt to have the refrigerator cool the room. Which of the following best describes the result of this decision? Explain your answer.
A. It will
cool the room very effectively
B. It will
cool the room, but inefficiently
C. It will
not change anything
D. It will
actually warm the room
The remaining questions are multiple-choice questions:
15. Consider
standing on a bathroom scale. How will the reading of the scale compare if you stand on one leg instead of two?
A. It will
show less
B. It will
show more
C. It will
show the same
16. Consider
standing on a bathroom scale. What does a bathroom scale show?
A. Mass
B. Density
C. Force
D. Pressure
17. Which has
the greater density, a lake full of water or a cup full of lake water?
A. The water
in the cup
B. The water
in the lake
C. Both have
the same density
18. The
largest extremes in temperature are usually experienced _____.
A. On
islands
B. In japan
C. In
coastal cities such as boston
D. In the
middle of the continents
E. Near the
oceans
19. The fact
that desert sand is very hot in the day and very cold at night is evidence that sand has a _____.
A. High
specific heat
B. High
density
C. Low
specific heat
D. Low
density
20. Which of
the following has the highest specific heat?
A. Water
B. Wood
C. Rock
D. Concrete
21. What
happens to the volume of a 1 kg of water when it is heated from 0oC to 2oC?
A. Increases
B. Decreases
C. Stays the
same
22. What
happens to the volume of a 1 kg of water when it is heated from 4oC to 6oC?
A. Increases
B. Decreases
C. Stays the
same
23. Heat
transfer by conduction in metals occurs when:
A. Atoms
give off energy in the form of radiation
B. A large
number of atoms move from one place to another
C. Electrons
collide with other electrons and with atoms.
D. Electromagnetic
waves travel though space to heat up an object.
24. Heat
transfer by convection occurs when:
A. Atoms
give off energy in the form of radiation
B. A large
number of atoms move from one place to another
C. Electrons
collide with other electrons and with atoms.
D. Electromagnetic
waves travel though space to heat up an object.
25. What
produces the cooling effect inside a refrigerator?
A. A
compression making the refrigeration gas condense to a liquid.
B. An
electric motor turning electrical energy into thermal energy.
C. Excellent
insulation.
D. The
evaporation of the refrigeration liquid.