A simple pendulum with a bob of mass $m$ is suspended from the roof of a car moving with a horizontal acceleration $a.$ Then A. The string makes an angle of ${\tan ^ – }\left( {\frac{a}{g}} \right)$ with the vertical.B. The string makes an angle of ${\tan ^ – }\left( {1 Read more…
Two blocks $A$ and $B$ of mass $m_{A}$ and $m_{B}$ respectively are kept in contact on a frictionless table. The experimenter pushes the block $A$ from behind so that the blocks accelerate. If the block $A$ exerts a force $F$ on the block $B$, what is the force exerted by Read more…
The force of buoyancy exerted by the atmosphere on a balloon is $B$ in the upward direction and remains constant. The force of air resistance on the balloon acts opposite to the direction of velocity and is proportional to it. The balloon carries a mass $M$ and is found to Read more…
Question: A mother is twice as old as her son. If 20 years ago, the age of the mother was 10 times the age of the son, what is the present age of the mother? A. 38 yearsB. 40 yearsC. 43 yearsD. 45 years Answer: 45 years Solution: Let the Read more…