wanaaaaaaaa
Badges: 3
Rep:
?
#1
Report Thread starter 2 years ago
#1
The mass of earth is 81 times the mass of the moon.The radius of earth is 4 times the radius of moon.What is the gravitational field strength on the Earth's surface?
0
reply
Eimmanuel
Badges: 13
Rep:
?
#2
Report 2 years ago
#2
(Original post by wanaaaaaaaa)
The mass of earth is 81 times the mass of the moon.The radius of earth is 4 times the radius of moon.What is the gravitational field strength on the Earth's surface?
It seems that the question need to give the gravitational field strength of the surface of the moon.

Express the gravitational field strength on the Earth's surface in terms of the mass of the moon and radius of the moon. You should get
gE = k gm
0
reply
wanaaaaaaaa
Badges: 3
Rep:
?
#3
Report Thread starter 2 years ago
#3
How can i get the value of k?
0
reply
Ajmaster
Badges: 6
Rep:
?
#4
Report 2 years ago
#4
g is proportional to M/R^2 therefore If you let g be constant and equal to the gravitational strength of the moon, calculate how g gets affected when you alter M and R. If the mass is 81 times the moon's then you can tell that g of the Earth is now 81G. Now if R on Earth is 4 times of that of the Moon, then you need to take into account the inverse square relationship. Therefore 1/(4R)^2 = 1/16R^2, Therefore you need to divide the current value of Earth's g by 16. So g on Earth is 81g/16. This is the answer I woud hope.
0
reply
wanaaaaaaaa
Badges: 3
Rep:
?
#5
Report Thread starter 2 years ago
#5
Yeah true. Thank you. I got it now.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

If you don't put your camera on in online lessons, why is that?

My teacher doesn't want us to (45)
17.51%
No one else does (81)
31.52%
I'm embarrassed about my background (28)
10.89%
I feel self-conscious showing my face (87)
33.85%
We don't use a video platform (4)
1.56%
I don't have a camera (6)
2.33%
Something else (tell us in the thread) (6)
2.33%

Watched Threads

View All
Latest
My Feed