Physics – 2nd Semester Final Exam Review
Day 1
1. Convert the following Celsius temperatures to Kelvin temperatures: 27 C
2. Convert the following Kelvin temperatures to Celsius temperatures: 110 K
3. A 2.0 kg sample of iron at an initial temperature of 500 K is dropped into a bucket containing 2.0 kg of water at an initial
temperature of 293 K. The two reach thermal equilibrium at 313 K. What is the specific heat capacity of the Iron?
4. A 0.20 kg sample of water at 60.0C is heated to steam at 140.0C. How much heat is absorbed?
(Cp for steam = 2.02 kJ/kg.K, Hvap = 2260 kJ/kg
5. 225J of work is done on a system while its internal energy is made to increase by 100J.
How much heat was transferred to/from the system?
6. What is the efficiency of a heat engine that operates between 1000°C and 2000°C?
7. An iron cylinder has a volume of 0.005 m3. It is submerged in water.
a. What buoyant force acts on it?
b. If the iron has a weight in dry air of 120N, what is its apparent weight?
8. A submarine has a viewing window that is a square 30 cm per side. If there is a force of 36,000 N acting on it,
what is the pressure at that depth?
9. The pressure of a gas inside a closed, rigid container will increase when the gas temperature increases.
The pressure of the gas increases because the
a. density of the gas decreases
b. rate of collisions of gas molecules with the surface increases
c. container expands in size when heated
d. gas molecules bond together to form more massive molecules
10. When I was 5 years old, my favorite movie was Star Wars. I loved the scenes where the X-Wing fighters were fighting
the evil TIE fighters, flying through outer space. The sounds of the fighters and the guns were amazing!
But you guys aren’t so easily amused. What was wrong with these scenes?
11. What are the similarities and differences between radio waves, visible light rays, and X-Rays, in terms of speed,
type of wave (transverse or compressional), wavelength, frequency and destructive energy.
12. Explain the types of waves used when you are talking to your BFF over your cell phone.
13. The frequency of piano note is 512 Hz. If the speed of sound in air is 343 m/s, what is the wavelength of the sound wave?
14. How are frequency and period related?
15. A couple years ago I went to the California Speedway to watch the Indy cars race.
From my seat, the cars somehow sounded different as they approached compared to after they passed.
My wife asked me why the engines always changed sound as they passed by. What would you have told her?
(Hopefully your answer includes the ________ Effect, and something about the wavelength, frequency, and pitch
of the car as it approaches and passes)
16. A bass guitar has a string length of 95 cm. If v = 343 m/s,
what is the fundamental frequency?
17. A 440-Hz tuning fork is held above a 0.39m pipe as shown.
What is the speed of sound here?
18. Objects appear different in size and shape in a container of water due to
a. refraction of the light waves b. interference of the water and light waves
c. polarization of the light waves d. diffraction of the light waves
19. What color is produced when blue light and green light are added together?
What is instead blue and green filters overlap?
20. A light ray is incident on water at a 30 angle as pictured.
If the index of refraction for air is 1.0, and for water is 1.33,
find the angle of refraction.
21. A 2cm object is placed 7cm in front of a concave mirror with a focal length of 3cm. Find the image.
Repeat with a convex lens. Repeat with a concave lens that has a focal length of -3cm.
Day 2
1. Draw the electric field surrounding a positive charge. Draw the electric field surrounding a negative charge.
2. How does the electric force change between 2 positive charges, if one of them is doubled in charge and the distance
between them is also doubled?
3. A +10 C charge and a –10 C charge are placed 1 m apart. What is the force between the two? Attractive or repulsive?
4. A +4 C test charge experiences a force of 0.10 N to the left in an electric field, as shown.
What is the magnitude of the E-field? Label the charge creating the E-field as + or –.
F=.1N
?
5. A charged PVC pipe creates an E-field of roughly 1 x 103 N/C at a distance of 0.05 m from it. q=+4μC
What is the electrical potential (V)?
6. A 27 F capacitor has an electric potential difference of 25 V across it. What is the charge on the capacitor?
7. I have a 12 V battery, some wires, and two 6 Ω resistors. (Think about series and parallel)
a. Could you please wire me a circuit where the current would be as small as possible?
b. Could you wire me a circuit where the current is as large as possible?
c. How much power does the 12 V battery produce in each circuit?
d. If a 12 V battery typically contains a chemical reaction with 24,000 J of energy available,
how long will the battery theoretically last?
8. A wire 0.50 m long carrying a current of 8.0 A along the (+) x axis is in a 0.40-T magnetic field oriented
toward the (+) y axis. What is the magnitude and direction of the force on the wire?
9. A step-down transformer has 7500 turns on its primary coil and 125 turns on its secondary coil.
The voltage across the primary circuit is 7.2 kV. What voltage is across the secondary circuit?
10. How much energy is associated with blue light that has a frequency of 6.3 x 1014 Hz?
11. An electron of mass 9.11 x 10-31 kg is accelerated by a potential difference up to a speed of 4.3 x 106 m/s.
What is the de Broglie wavelength of this electron?
12. A sample of 1.0 g of tritium , 31H, is present. (Half Life of 12.3 years.)
What will be the mass of the tritium remaining after 36.9 years?
4
13. 210
(Your test question is MUCH harder!)
84 Po  ___ + 2 α