B:An object of mass 5 kg weighs 49 N at the surface of Earth. At an...

Question

Question

B:An object of mass 5 kg weighs 49 N at the surface of Earth. At an altitude equal to twice the Earth's radius its weight is

a)49 N

b)24.5 N

c) 5.44 N

science physics

Answer 1

Answer #1

B )

given

m = 5 kg

the weight at twice radius ,

R_e_arth should be 2 R_earth

using equation

W = G m M_earth / ( 2 R_earth )²

= 6.67 x 10^-11 x 5 x 5.98 x 10²⁴ / ( 2 x 6.371 x 10⁶ )²

= 19.9433 x 10¹⁴ / 4 x 6.371² x 10¹²

W = 12.271 N

W = 12.3 N

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Answer 2

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