### How JustAnswer Works:

• Ask an Expert
• Get a Professional Answer
• 100% Satisfaction Guarantee

Matrix, Tutor
Category: Homework
Satisfied Customers: 419
Experience:  Masters
21626334
Type Your Homework Question Here...
Matrix is online now

# 2. What is the kinetic energy of an object that has a mass

### Resolved Question:

2. What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?

A. 12,000 J
B. 2,940 J
C. 6,000 J
D. 5,880 J

3. The main difference between speed and velocity involves

A. direction.
B. gravity.
C. weight.
D. distance.

4. A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge?

A. 1,254.4 meters
B. 313.6 meters
C. 78.4 meters
D. 39.2 meters

5. If a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground, what is the final velocity of the stone?

A. 39.2 m/s
B. 78.4 m/s
C. 156.8 m/s
D. 42.6 m/s

6. If an object has a mass of 20 kg, what is the force of gravity acting on it on earth?

A. 196 N
B. 1.96 kg
C. 2.04 kg
D. 32.67 N

7. A car with a mass of 1,200 kilograms is moving around a circular curve at a uniform velocity of 20 meters per second. The centripetal force on the car is 6,000 newtons. What is the radius of the curve?

A. 160 meters
B. 16 meters
C. 32 meters
D. 80 meters

8. An object with a mass of 78 kilograms is lifted through a height of 6 meters. How much work is done?

A. 764.4 J
B. 47.75 J
C. 4,586.4 J
D. 468 J

9. Oil flows upward in the wick of a lantern because of the liquid property called

A. capillarity.
B. viscosity.
C. density.
D. meniscusity.

10. The orbits of planets being elliptical was one the planetary laws developed by

A. Kepler.
B. Ptolemy.
C. Brahe.
D. Copernicus.

11. When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of about

A. 2.5.
B. 1.3.
C. 1.0.
D. 0.15.

12. A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?

A. 97 percent
B. 94 percent
C. 92 percent
D. 96 percent

13. A man standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down the man continues moving forward at the original speed. This is an example of the effect of

A. weight.
B. velocity.
C. inertia.
D. gravity.

14. What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?

A. 1.875 kg
B. 23 kg
C. 23 N
D. 120 N

15. In a practical machine, the power output is _______ the power input.

A. smaller than
B. equal to
C. multiplied by
D. larger than

16. An object has a mass of 120 kg on the moon. What is the force of gravity acting on the object on the moon?

A. 196 N
B. 1,176 N
C. 20 N
D. 12.24 N

17. The metric unit of force is the

A. nanometer.
B. kilogram.
C. gram.
D. newton.

18. The ability of a material to transfer heat or electric current is called

A. insulation.
B. convection.
C. porosity.
D. conductivity.

19. In which of the following units is acceleration expressed?

A. Meters per second squared
B. Newtons
C. Kilograms
D. Foot-pounds

20. A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?

A. 6,700.56 N
B. 7,600.18 N
C. 6,150.64 N
D. 5,362.56 N
Submitted: 3 years ago.
Category: Homework
Expert:  Matrix replied 3 years ago.
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying \$3.
Matrix, Tutor
Category: Homework
Satisfied Customers: 419
Experience: Masters
Matrix and 6 other Homework Specialists are ready to help you

### JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

### What Customers are Saying:

• Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
• Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
• This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
• Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
• I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
• Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
• Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
• He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX

• ### Manal Elkhoshkhany

#### Satisfied Customers:

4524
More than 5000 online tutoring sessions.
< Last | Next >

### Manal Elkhoshkhany

#### Satisfied Customers:

4524
More than 5000 online tutoring sessions.

### LogicPro

#### Satisfied Customers:

3748
Expert in Java C++ C C# VB Javascript Design SQL HTML

### Linda_us

#### Satisfied Customers:

3125
Post Graduate Diploma in Management (MBA)

### Chris M.

#### Satisfied Customers:

2414
Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)

### F. Naz

#### Satisfied Customers:

1998
Experience with chartered accountancy

### Bizhelp

#### Satisfied Customers:

1878
Bachelors Degree and CPA with Accounting work experience

### Seanna

#### Satisfied Customers:

1781
3,000+ satisfied customers, all topics, A+ work

## Related Homework Questions

Chat Now With A Tutor
Matrix
307 Satisfied Customers
Masters