Expert Answer :physics 2 questions

  

Solved by verified expert:Eval 1:20. Compared to a large bucket of cool water, one cup of boiling water a. must contain more heat. b. must have a higher average kinetic energy. c. must have the same total internal energy. d. we can’t know any of the above for certain. 21. Compared to one cup of boiling water, two cups of boiling water a. must contain more internal energy.
b. must have a higher average kinetic energy.
c. must have the same total internal energy. d. we can’t know any of the above for certain. 27. Under what conditions will ice form?
a. when energy is added to water at 0 degrees C
b. when energy is added to water at 100 degrees C
c. when energy is removed from water at 0 degrees C
d. when energy is removed from water at 100 degrees C 34. Which of the following can be used to change the air temperature? a. solar radiation b. evaporation
c. changing air pressure d. all of the above Eval 2:12. According to the following table, determine the source of sound that is 100 times as intense as the normal sound in a library. Source of Sound Level in dB jet engine at 30m. 140 old subway train 100 average factory 90 normal speech 60 library 40 a. jet engine at 30m b. old subway train c. average factory d. normal speech 23. What is a complementary color?
a. the color that is produced when one color is subtracted from white light b. one of two colors that go well together
c. the color that is produced when two primary colors are added PT 1:2. According to the following table, determine the source of sound that is 10 times as intense as the average factory. Source of Sound Level in dB jet engine at 30m 140 old subway train 100 average factory 90 normal speech 60 library 40 A. old subway train
B. normal speech
C. jet engine at 30m
16. When 10 grams of a substance loses 20 calories in cooling 5°C, its specific heat capacity is A. 10
B. 0.4
C. 2.5
28. If you add a –10°C piece of ice to a 15°C glass of water, you might get water at A. -10°C
B. 5°C
C. 15°C
29. Your friend claims that mixing colored paints gives the same results as mixing different colors of light. Do you agree or disagree? A. agree
B. disagree
34. Same answer as eval 2 #2336. When a gas undergoes an adiabatic compression A. it gains internal energy and its temperature increases.
B. it is compressed into a liquid by adiabatic liquefaction.
C. its volume decreases but its temperature remains constant.
47. A certain ocean wave has a period of 100 seconds and a wavelength of 1 km. What is the wave’s speed? A. 0.01 m/s
B. 100 m/s
C. 10 m/s
Eval 3:11. Which of the following statements is true?
a. If a laser beam enters a container of water at the left and exits at the right, the path would be the same as if the light entered from the right and exited at the left. b. Light paths are reversible for reflection but not refraction. c. A full glass mug appears to hold more colored liquid than it actually does because of re- flection. 12. What is the significance of the “critical angle” between water and air? a. It is the angle at which light is half reflected and half refracted when passing from air into water. b. It is the angle at which light is completely reflected when passing from air into water. c. It is the angle at which light is completely refracted when passing water into air.
d. It is the angle at which light is completely reflected when passing from water into air. 20. Where should you place an object in front of a diverging lens in order to form a virtual image? a. less than f b. at f
c. beyond f d. anywhere 35. Refraction can be caused by a change in temperature of the medium. a. true b. false Eval 4:6. Charged particles are usually formed by adding or removing a. electrons in the electron cloud.
b. protons from the nucleus.
c. electrons from the nucleus. d. protons from the proton cloud. 13. A lightning rod placed above a building repels electrons in the air to prevent leaking of charge onto the ground. a. True b. False 15. Coulomb’s law says that the electric force F =k (q1q2/d2) . If the charge of each particle tripled d2
and the distance also tripled, how would the electrostatic force between the particles change? a. 3X greater b. 3X less
c. 9X greater d. no change 19. Which of the following statements is NOT true about electric shielding? a. When an electric field is applied, free electrons in the conductor rearrange themselves to create an equal and opposite electric field. b. The charges arrange themselves to ensure a zero field within the material.c. If the conductor is spherical, then the charge distribution will not be uniform. 21. What is the difference between a capacitor and a battery? a. A battery stores energy while a capacitor uses the energy to do work. b. They are two names for the same thing and they work in the same way. c. They both store energy but a battery releases it slowly while a capacitor releases it all at once. d. A capacitor stores energy while a battery is used to do work (like lighting a bulb). 28. Typical household wiring provides a. direct current. b. alternating current.
c. a combination of direct and alternating current depending on what appliance is being used. 30. Is it incorrect to say that electric current flows out of and into a battery? a. No, that must happen for the circuit to be complete. b. Yes, electrons flow continuously around the circuit and the “current” is the result of moving electrons. c. No, batteries store current and release it as needed. d. Yes, current only flows “out of”, not “into” a battery. PT 2:6. When a negatively charged rod is placed in contact with a neutral object :A. all of the charge will transfer making the rod neutral and the object negative.
B. some of the charge will transfer making the rod positive and the object negative.
C. some of the charge will transfer making both the rod and object negative.
19. Where should you place an object in front of a diverging lens in order to form a virtual image? A. less than f
B. beyond f
C. anywhere
25. What kinds of lenses are used in the objective and eyepiece of a simple telescope? A. converging, then diverging, respectively
B. both diverging
C. both converging
31. What voltage must be applied to a circuit with 10 ohms of resistance to produce 0.2 A of current? (Apply Ohm’s Law.) a. 2V b. 50V c. .02V 32. You are working for a telescope manufacturing company, and your job is to test precision lenses for flaws. You place a lens on a perfectly flat piece of glass, illuminate it from above with monochromatic light, and then observe irregularly spaced fringes. What could this result tell you about the lens? A. The lens has been polished too much and is therefore too smooth.
B. The lens has not been polished enough and is therefore irregular.
C. The lens has been polished too much and is therefore too concentric.
50. If you stand 1 m in front of a plane mirror your image appears A. less than 1 m behind the mirror.
B. 1 m behind the mirror.
C. more than 1 m behind the mirror.
Eval 5:4. What happens when a compass needle is brought close to a current carrying wire? a. The compass needle does not respond. b. The compass needle is deflected one way or another depending on the direction of the current. c. The compass needle is always deflected to the right (right hand rule). d. The compass needle is always deflected to the left. 6. What is the direction of the magnetic field inside a magnet? a. from the north pole to the south pole
b. from the south pole to the north pole
c. from the north pole outward in all directions d. from the south pole outward in all directions 20. Electricity is a source of energy. a. true b. false 28. Why is power transferred long distances at very high voltage?
a. Using high voltage means we get more power to our homes.
b. High voltages are required to get the currents we need for a typical home.
c. High voltage wires are less dangerous than low voltage wires.
d. High voltage wires allow us to reduce the current, which means less resistance and heat. 31. What is the source of all electromagnetic waves? a. electric wires spun in magnetic fields.
b. accelerating electric charges.
c. an electric field. Eval 6:11. What is quantum physics?
a. study of motion at very small (atomic level) distances b. study of motion at very high speeds
c. study of motion near very large masses 17. A nucleus needs a certain ratio of _________ to __________ to make it stable. a. protons, electrons b. protons, neutrons c. neutrons, electrons PT 3:22. You are actually looking into the future when you look at A. both galaxies and a newspaper.
B. neither galaxies or a newspaper.
C. far away galaxies.
D. today’s newspaper.
24. If the linear dimensions of a wooden bridge are scaled up 100 times, its strength will increase by ___________, and its weight will increase by _______________. A. 100, 1000.
B. 1000, 100.
C. 100, 100.
D. 10,000; 1,000,000.
29. Which has more density, 5 boxes of pineapples or 10 boxes of pineapples? A. They both have the same density.
B. 10 boxes of pineapples have more density.
C. 5 boxes of pineapples have more density.
37. You are communicating with aliens on Jupiter and Saturn. When you send a light beam message to your friend on Jupiter and receive a message from your friend on Saturn, you realize that the light messages became curved when they passed by the sun. The sum of the angles in the triangle formed by the paths your messages take is larger than 180 degrees due to the A. flat plane of the solar system.
B. Euclidean geometry of the solar system.
C. 4 dimensional geometry of the solar system.
D. mass of the sun has no affect on the light messages.

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