Water in a bucket is whirled in a vertical circle with a string attached to it,

It would make it more difficult for us to walk on a soapy floor because layer of soap makes floor smooth. The coating of soapy water reduces the friction and...

(i) Washing 10 clothes (ii) Irrigating a crop field

(i) Brushing your teeth (ii) Washing a handkerchief

(i) Bubbles of air came out from the bottle.  (ii) Some water entered the bottle. 

(c) mg is not greater than mv2/r Explanation : At the top position the weight of the water mg acts downward to bring it down while due to inertia water tries to escape upward...

 (c) along a tangent  Explanation: When a particle moves in a circle with a speed v, its instantaneous velocity has a magnitude v and direction along the tangent at that point. The...

(c) √(3gl). Explanation:-  Let speed at the top = v, it is balanced by weight mg, so, mv²/l=mg  →v²= gl  Now let the speed when string is horizontal = v'  Here total energy = ½mv'²=½mv²+mgl  v'²=v²+2gl =...

(a) The string becomes slack when the particle reaches its highest point.  (d) The particle again passes through the initial position Explanation:  Since the particle is just able to complete the circle, at...

(a) periodic EXPLANATION:   Since a uniform circular motion repeats itself at a regular time interval.         (b) not true because it is not a to and fro motion.       ...

 (c) along a tangent  Explanation: When a particle moves in a circle with a speed v, its instantaneous velocity has a magnitude v and direction along the tangent at that point. The direction of...