Advertisements
Advertisements
प्रश्न
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
Advertisements
उत्तर
We know that , K.E = `1/2` mv2
375 = `1/2` x 30 x v2
or v2 = `(375 xx 2)/30` = 25 m/s
or v = 5 m/s
APPEARS IN
संबंधित प्रश्न
Name a common device where a gear train is used
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
What is the ratio of SI units to CGS units of 'work'?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
A is a push or a pull ______.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
