• 100% Satisfaction Guarantee

Dr WLS, PhD
Category: General
Satisfied Customers: 483
Experience:  PhD degree in engineering/physics , online tutor since 1994 in general subjects
77828
Dr WLS is online now

# why does the force of gravity change the speed of a

### Resolved Question:

Why does the force of gravity change the speed of a satellite in an elliptical orbit?

Dr WLS Requested

Submitted: 8 years ago.
Category: General
Expert:  Dr WLS replied 8 years ago.

If the orbit is elliptical, then by definition it is not circular.

If it is not circular, the distance of the satellite from the center of the Earth (R) must change during each orbit.

Since g is proportional to 1/R^2, the acceleration of gravity must also change between maximum and minimum values during each orbit.

Your question is why the speed changes. The speed changes in an elliptical orbit for the following reason: As the distance from the center of the earth changes, the potential energy in the Earth's gravitaional field changes. Like any falling object, the closer it is to the center of the Earth, the faster it moves. Potential energy is exchanged for kinetic energy.

Dr WLS, PhD
Category: General
Satisfied Customers: 483
Experience: PhD degree in engineering/physics , online tutor since 1994 in general subjects

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.
...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

• ### Ron

#### Satisfied Customers:

21776
23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >

### Ron

#### Satisfied Customers:

21776
23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

### Dr. Y.

#### Satisfied Customers:

18778
I am fellowship trained specializing in general urology and reconstructive urology.

### John

#### Satisfied Customers:

13453
Appliance repair business owner for over 43 years.

### Tina

#### Satisfied Customers:

8681
JD, BBA Over 25 years legal and business experience.

### dermdoc19

#### Satisfied Customers:

3945
30 years practice in general and cosmetic dermatology

### Dr. Pat

#### Satisfied Customers:

3463
25+ years working primarily or exclusively with birds

### Dr. Gary

#### Satisfied Customers:

3421
DVM, Emergency Veterinarian, BS (Physiology)

## Related General Questions

Chat Now With An Expert
Dr WLS
86 Satisfied Customers
PhD degree in engineering/physics , online tutor since 1994 in general subjects