NEET Physics — Laws of Motion

A stone of mass $0.3 \, \text{kg}$ is whirled in a horizontal circle of radius $2 \, \text{m}$ at $20 \, \text{rev/min}$. What is the tension in the string?

A $5 \, \text{kg}$ block on a horizontal surface ($\mu_k = 0.3$) is connected to a $3 \, \text{kg}$ mass over a pulley. A force of $20 \, \text{N}$ at $60^\circ$ to the horizontal pulls the $5 \, \text{kg}$ block. What is the acceleration? (Take $g = 10 \, \text{m/s}^2$, $\sin 60^\circ = 0.866$, $\cos 60^\circ = 0.5$)

A $55 \, \text{kg}$ man in a lift accelerating upward at $1 \, \text{m/s}^2$ stands on a scale. What is the reading? (Take $g = 10 \, \text{m/s}^2$)

A $1500 \, \text{kg}$ car on a banked road ($\theta = 20^\circ$, $\mu_s = 0.25$) turns at radius $60 \, \text{m}$ with a tangential force of $3000 \, \text{N}$ reducing speed. What is the maximum initial speed? (Take $g = 10 \, \text{m/s}^2$, $\tan 20^\circ \approx 0.364$)

A $0.36 \, \text{kg}$ stone is whirled in a horizontal circle of radius $1.7 \, \text{m}$ with a tension of $14 \, \text{N}$. What is the speed? (Take $g = 10 \, \text{m/s}^2$)