Name: ________________________ Class: ___________________ Date: __________ ID: A
Phy104F15-Sample Questions for Exam-3- goderya
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Two masses
1.01 × 10 5
1 000 kg/m 3 ) m
Pa)
1
and m
2
, with kinetic energies compare?
m d. More information is needed.
1
<
× 10 3 kg/m 3 d. 1.58 × 10 3 kg/m 3 m
2
, have momenta with equal magnitudes. How do their a. KE
1
< KE
2 b. KE
1
= KE
2 c. KE
1
> KE
2
2. How deep under the surface of a lake would the pressure be double that at the surface? (1 atm = a. 1.00 m b. 9.80 m c. 10.3 m d. 32.2 m
3. A solid rock, suspended in air by a spring scale, has a measured mass of 9.00 kg. When the rock is submerged in water, the scale reads 3.30 kg. What is the density of the rock? (water density = a. 4.55 × 10 3 kg/m 3 b. 3.50 × 10 3 kg/m 3 c. 1.20
4. Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force. What work does she do?
a. 10.0 J b. 25.0 J c. 125 J d. 550 J
5. Which of the following is an example of a nonconservative force?
a. gravity b. magnetism c. friction d. Both choices A and B are valid.
6. A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 b. 3/8 c. 7/16 d. 9/16
7. Samantha pushes a 50-N crate up a ramp 25.0 m in length and inclined at 10 ° with the horizontal.
What potential energy change does the crate experience?
a. 13 J b. 55 J c. 120 J d. 220 J
8. An amount of work equal to 1.5 J is required to compress the spring in a spring-gun. What is the
"launch speed" of a 15-g marble?
a. 14 m/s b. 15 m/s c. 18 m/s d. 21 m/s
9. A helicopter is traveling at 40 m/s at a constant altitude of 100 m over a level field. If a wheel falls off the helicopter, with what speed will it hit the ground? ( g = 9.8 m/s 2 and air resistance negligible) a. 40 m/s b. 50 m/s c. 60 m/s d. 70 m/s
10. Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30 ° and for the second 60 ° . Which of the following statements is false?
a. Both projectiles have the same acceleration while in flight. b. The second projectile has the lower speed at maximum altitude. c. Both projectiles have the same range. d. All of the above statements are false.
1
Phy104F15-Sample Questions for Exam-3- goderya
Answer Section
MULTIPLE CHOICE
1. C
2. C
3. D
4. C
5. C
6. C
7. D
8. A
9. C
10. D
ID: A
1
0
