Banner 0
Banner 1
Banner 2
Banner 3
Banner 4
Banner 5

Q.

The distance of a point from the earth’s centre where the resultant gravitational force due to earth and the moon is zero is___. (Mass of the earth= 6×1024kg, Mass of the moon= 7.4×1022  kg, The distance between the earth and moon= 4×105km )

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

a

3.6×105km

b

3.6×105km

c

3.6×1010km

d

3.6×105m

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Given:
Mass of earth =6×1024kg=M 

Mass of moon =7.4×1022kg=m

Distance between the earth & the moon, r=4×105km

To find:  
A point A along line joining earth & moon where resultant force= 0

Let the distance of A from earth = x                             

At A force due to earth = force due to moon

GMemx2=G.Mmm(rx)2

Question Image

Mex2=Mm(rx)2

Mm=(xrx)2

6×10247.4×1022=xrx

9=xrx                                      

9r9x=x                                        r=4×105km

x=9r10=9×4×10510=3.6×105km

We get x=3.6×105km

Watch 3-min video & get full concept clarity

Best Courses for You

JEE

JEE

NEET

NEET

Foundation JEE

Foundation JEE

Foundation NEET

Foundation NEET

CBSE

CBSE

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon