Question 83: Work, Energy and Power & Circular Motion

Question

A car is moving with a constant speed of 20 m/s in a circular horizontal track of radius 40 m. A bob is suspended from the roof of the car by a massless string. The angle made by the string with the vertical will be : (Take g = 10 m/s$$^2$$)

Accepted Answer

In carÃ¢ÂÂs frame, FBD of bob
where $a_{P}=$ Pseudoforce or centrifugal force
$	heta=	an ^{-1}\left(\frac{a_{P}}{g}ight)=	an ^{-1}\left(\frac{v^{2}}{R g}ight)=	an ^{-1}\left(\frac{400}{40 	imes 10}ight)$ $=45^{\circ}$

Answer

$$\frac{\pi}{2}$$

Answer

$$\frac{\pi}{6}$$

Answer

$$\frac{\pi}{4}$$

Answer

$$\frac{\pi}{3}$$

Work, Energy and Power & Circular Motion

A car is moving with a constant speed of 20 m/s in a circular horizontal track of radius 40 m. A bob is suspended from the roof of the car by a massless string. The angle made by the string with the vertical will be : (Take g = 10 m/s$^2$)

Choose the correct answer: