• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Help me Please

  • Thread starter Dragoon
  • Start date
17
0
The earth has an orbit of radius 148 million km around the sun. What is the speed of the earth on this orbit?

dont know how to do it i have used a couple of different formulas and havent gotten it right can anyone help?
 
551
1
Can you not use v = rω and the fact that ω = 2π/T?
 

NateTG

Science Advisor
Homework Helper
2,449
5
Dragoon said:
The earth has an orbit of radius 148 million km around the sun. What is the speed of the earth on this orbit?

dont know how to do it i have used a couple of different formulas and havent gotten it right can anyone help?
How long does the earth take to make an orbit around the sun?
What distance does the earth travel in an orbit?
(Since the problem tells you that the orbit has a radius you can probably safely approximate the orbit with a circle of the appropriate radius.)
Then you can find speed using [tex]s=\frac{d}{t}[/tex] although you might want to do some unit conversion.
 
6
0
NateTG said:
How long does the earth take to make an orbit around the sun?
What distance does the earth travel in an orbit?
(Since the problem tells you that the orbit has a radius you can probably safely approximate the orbit with a circle of the appropriate radius.)
Then you can find speed using [tex]s=\frac{d}{t}[/tex] although you might want to do some unit conversion.
Period T = 365 days = ... seconds.
Then using formulae which Nylex gave.
 
1,197
1
What is the speed of the earth on this orbit? 30km/s
 

Related Threads for: Help me Please

  • Posted
Replies
5
Views
1K
  • Posted
Replies
6
Views
979
  • Posted
Replies
4
Views
1K
  • Posted
Replies
1
Views
887
  • Posted
Replies
1
Views
976
  • Posted
Replies
2
Views
1K
  • Posted
Replies
2
Views
873
  • Posted
Replies
2
Views
834

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top