Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on...
PHYSICS
WAEC 2018
Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q. \([G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]\)
- A. \(1.11\times 10^{-7} N\) towards P
- B. \(1.11\times 10^{-7} N\) towards Q
- C. \(9.26\times 10^{-8} N\) towards P
- D. \(9.26\times 10^{-8} N\) towards Q
Correct Answer: D. \(9.26\times 10^{-8} N\) towards Q
Explanation
\(F= \frac{Gm_{1}m_{2}}{r^{2}}\)
\(m_{1} = 100kg\)
\(m_{2} = 20kg; r =1.2m\)
\(G= 6.67\times 10^{-11}\)
\(F = \frac{6.67\times 10^{-11}\times 100\times 20}{(1.2)^{2}} = 9.26\times 10^{-8}\)
The acceleration of each object is inversely proportional to the mass, the lighter object will move a bit faster, hence. the force will act in the direction of Q.
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *