Question

Two masses m1= 2x105 kg and m2= 5x105 kg are separated by 10 m. Find the net gravitational force between them in ( N )

(G=6.67x10 -11N.m2/kg2 )Phys 211 Midterm exam


A 400-kg load is hung on a wire of length 4.00 m, cross sectional area 0.2x10-4 m2, and Young’s modulus

8 x1010 N/m2. What is its increase in length in mm?​

Answer 1

Q1. Gravitational force is given by the following equation.

F= GMm/r²

from the given data we have

F=

$6.67 \times 10 { - }^{11} \times 2 \times {10}^{5} \times 5 \times 10 {}^{5} = 6.67 newton$