There is no need to give an explanation, please only give correct answers. Also, please answer all questions as this is very important.

1. An airplane is flying at a constant velocity at an altitude of 400 m.Which of the following are pairs of equal and opposite forces that act on the airplane? There may be more than one correct answers.

a. Gravity and lift

b. Thrust and gravity

c. Thrust and lift

d. Gravity and drag

e. Thrust and drag

f. Drag and lift

2. Which of the following temperatures are about equal?

a. - 40 K and - 40^o F

b. 574 K and 574^o F

c. 273 K and 273^o F

d. 0 K and 0^o F

3. The SI unit for temperature is:

a. ^oK

b. ^oC

c. either^oC or K

d. K

4. You are in the kitchen with 3 mixing bowls in front of you. One bowl is metal, the 2nd is glass, and the 3rd is plastic. All 3 are at the same temperature as the room (68 F). If you make the three bowls touch each other,

a. no net heat will flow between the bowls.

b. will flow from the metal to the glass bowl and from the glass to the plastic bowl.

c. the net heat will flow from the plastic to the glass bowl and from the glass to the metal bowl.

d. will flow from the glass bowl to both the plastic and the metal bowls.

5. Match the following events with chief thermal processes that make them possible.

Frying an egg in a pan Getting the bottom of your feet scorched by walking on hot sand Getting warm while sitting next to a campfire

Using a ceiling fan to spread the heat from a fireplace to the rest of a room

conduction radiation convection

conduction radiation convection

conduction radiation convection conduction radiation convection

6. Which temperature scale has 273 as the freezing point of water?

a. Celsius

b. Kelvin

c. Centigrade

d. Fahrenheit

7. Consider a 2-liter jug of waterat 10C and a 40-milliliter cup of water at 10C. Which hassmaller thermal energy?

a. The cup, since it contains fewer moleculesand thermal energy measures the total energy of all the particles in an object.

b. The cup, since it contains fewer molecules, and thermal energy measures the average energy of the particles in the cup.

c. The cup and the jug have equal amounts of thermal energy, since thermal energy measures the temperature and the temperature in both cases is 10C.

d. The cup, since it contains fewer molecules and each molecule must carry more thermal energy in order to achieve the same temperature as the jug.

8. Metal spheres A and B each contain 4500 J of thermal energy. Which of the following is possible?

a. Sphere A is at a higher temperature than sphere B and has more mass than sphere B.

b. Sphere A is at a lower temperature than sphere B and has less mass than sphere B.

c. Sphere A is at a lower temperature than sphere B and has the same mass as sphere B.

d. Sphere A is at a higher temperature than sphere B and has less mass than sphere B.

9. A spring makes 16 oscillations in 8 seconds. Its period and frequency are, respectively, about:

a. 0.5 s; 2 Hz

b. 0.5 s; 0.5 Hz

c. 2 s; 0.5 Hz

d. 8 s; 16 Hz

10. A 10-kg package rests on one of its sides on a horizontal surface. The area of the side is 0.12-m². What is the total pressure exerted by the package on the table?

a. 817 Pa

b. 12 Pa

c. 83 Pa

d. 1.2 Pa

11. A positively charged insulating rod is brought close to an object that is suspended by a string. If an object is repelled away from the rod we can conclude:

a. the object is a conductor

b. the object is negatively charged

c. the object is an insulator

d. the object is positively charged

12. Particle A and particle B interact with each other. Particle A has twice the charge of particle B. Compared to the force on particle A, the force on particle B is

a. half as much

b. the same

c. two times as much

d. four times as much

13. A balloon will stick to an uncharged wooden wall if the balloon is charged

a. only positively

b. only negatively

c. neither positively nor negatively

d. either positively or negatively

14. Two charges separated by 6meters exert 5-N forces on each other. If the charges are pushed to 1.5-meter separation, the force on each charge will be

a. 80 N

b. 2.5 N

c. 20 N

d. 1.25 N

e. 40 N

15. A 3-volt battery supplies a light bulb with 1.8 J of energy each second. Find the current that flows through the light bulb.

a. 0.6 A

b. 1.7 A

c. 5.4 A

d. 0.9 A

16. You need 27 J of work to push a 3-C charge from point A to point B in an electric field. What is the voltagebetween these two points?

a. 9 V

b. 81 V

c. 1.610^-19 V

d. 0.11 V