Embibe Experts Solutions for Chapter: Laws of Motion, Exercise 1: AMU-AT (B.Tech.) 2018

A plumb line is suspended from a ceiling of a car moving with horizontal acceleration $a$. What will be the angle of inclination with vertical?

A particle is moving in a circle with uniform speed $v$. In moving from a point to another diametrically opposite point

Consider the following statements about the four fundamental forces in nature.
(i) The strong nuclear force binds protons and neutrons in a nucleus.
(ii) The strong nuclear force is about ${10}^3$ times the electromagnetic force in strength.
(iii) The weak nuclear force is the weakest of all the four fundamental forces.
(iv) The range of the weak nuclear is about ${10}^{-16} \mathrm{m}$
The correct statement(s) is (are)

A man throws a ball of mass $3.0 \mathrm{kg}$ with speed of $5.0 \mathrm{m} {\mathrm{s}}^{-1}$. His hand is in contact with the ball for $0.2 \mathrm{s}$. If he throws $4$ balls in $2$ seconds, the average force exerted by him in $1$ second is