Question

1. Object X weighs 75 N on Earth & object Y weighs 30 N on the moon. Which object has more mass? (Acceleration due to gravity on the moon is 1.67m/s^2)
Object X
Object Y
They have the same amount of mass.
2. An object on Saturn has a mass of 20 kg. What is its weight? (acceleration due to gravity on Saturn is 10.44 m/s/s)
0.522 N
1.916 N
30.44 N
208.8 N
3. A force of 30 N acts upon a 7 kg block. Calculate its acceleration
0.23 m/s^2
4.28 m/s^2
37 m/s^2
210 m/s^2
4. Four women push a stalled car. Each woman pushes with a 375 N force. What is the mass of the car if the car accelerates at 1.5 m/s^2?
250 kg
562.5 kg
1000 kg
2250 kg
5. When an F-14 airplane takes off an aircraft carrier, it is literally catapulted off the flight deck. The plane’s final speed at take-off is 100 m/s. The F-14 starts from rest. The plane accelerates in 5 seconds & has a mass of 35,000 kg. What is the total force that gets the F-14 in the air?
350 N
1750 N
700,000 N
3,500,000 N
6. A car has a mass of 1700 kg & is traveling at a speed of 45 m/s. What is its momentum?
0.026 kg*m/s
37.8 kg*m/s
1,745 kg*m/s
76,500 kg*m/s
7. Karen needs to hang a picture in her bedroom. She uses a hammer to drive the nail into the wall. Find the force exerted by the hammer on the nail if the hammer stays in contact with the nail for 0.3 s & has an impulse of 30 Ns
0.01 N
9 N
30.3 N
100 N
8. Two train cars collide. The smaller car is 1500 kg & the larger car is 3500 kg. Before the collision, the smaller car was at rest, while the larger car was traveling at 15 m/s. After the collision, the smaller car had a velocity of 20 m/s. What was the final velocity of the larger car?
-0.16 m/s
0.16 m/s
6.4 m/s
-6.4 m/s
9. A 120 kg football player has the ball & is running toward the goal at 7 m/s when he is met head on by a 170 kg linebacker running at 5 m/s. Assume the linebacker tackles & holds onto the other player. Will there be a touchdown?
No, because the final velocity is -0.034 m/s.
Yes, because the final velocity is -0.034 m/s.
No, because the final velocity is 5.83 m/s.
Yes, because the final velocity is 5.83 m/s,
10. You are at the bowling alley trying to get a single pin spare. The roll is a little to the side, so the bowling ball hits the pin off center, causing the pin to shoot off toward the left side of the lane. What direction does the ball go?
Straight
Backward
To the right
To the left
11. Imagine a 1200 kg car traveling in the positive x-direction at 30 m/s & an identical car traveling in the opposite direction at -30 m/s. Do the two cars have the same kinetic energy?
Yes, because one is positive & the other is negative.
Yes, because you have to square velocity to find KE.
No, because one is positive & the other is negative.
No, because you have to square velocity to find KE.
12. Imagine a glass cup sitting on a table. The glass has a mass of 0.6 kg & its position is 2.4 m off the ground. What is its gravitational potential energy?
14.1 J
4 J
1.44 J
0.25 J
13. A spring attached to the ceiling has an original length of 0.2 m & a spring constant of 50 N/m. It is stretched downward 0.2 m by a force. How much potential energy does it have?
1 J
2.5 J
5 J
250 J
14. A 4000 kg elevator is lifted 50 m by a cable in 10 s. How much work does the cable do?
80 J
784 J
200,000 J
1,960,000 J
15. Going off the previous problem, how much power was generated?
8 W
78.4 W
20,000 W
196,000 W
16. 42 degrees Celsius is equal to what temperature in Kelvin?
-231 K
231 K
315 K
331 K
17. How many Joules of heat are needed to raise the temperature of 35 g of aluminum from 15℃ to 50℃ if the specific heat of aluminum is 0.9 J/g℃?
0.00073 J
1102.5 J
1361.1 J
1575 J
18. A system gains 53 kJ of heat & performs 46 kJ of work on the surroundings. What is the value of ∆U?
-99 kJ
-7 kJ
7 kJ
99 kJ
19. If I contain 2 moles of gas in a container with a volume of 32 L & at a temperature of 350 K, what is the pressure inside the container?
89.47 atm
1.79 atm
0.56 atm
-89.47 atm
20. Let’s say the average temperature of our gas is 500 K & the cold gas has an average temperature of 200 K. When mixed, they exchange 2000 J of heat & end up at a final equilibrium temperature of 350 K. What is the change in entropy of the system?
-0.175 J/K
0.175 J/K
-5.71 J/K
5.71 J/K