Question

The angular velocity of the earth about its polar axis so that the weight of the body at the equator will be zero is

(A) 1.25 x 10 -³rad/s

(B) 2 rad/s

(C) 1 rad/s

(D) Zero

in option a the - is near 3​

Answer 1

Answer:

g

′

=g−ω

2

Rcos

2

ϕ

At equator, g

′

=g−ω

2

R

For weight to be zero, g

′

=0

⇒ω

2

R=g

=ω

2

=

R

g

=

6400×10

5

9.8

=

6.4

9.8

×10

−6

⇒ω=1.25×10

−3

rads

−1

Answer 2

Answer:

above answer is good and nice