speed = distance / time
= 2πr*No. of rotations / t
= 2π(0.5) *100/ 50
1. That is due to the mechanical rotational energy stored in it
2.Fricton and lose of energy in addition to no more energy supplied..
• In the given question information given about an electric fan rotating at 5 rev/sec is switched off. It comes to rest in 10 sec.
• We have to find uniform deceleration.
• According to given question :
Revolution/sec = 5 rev/sec
time taken to stop = 10 sec
A body in motion posseses a property called inertia (inertia is a property due to which an object continues it's state of motion after application of a force) also it stops after some time cause theres loss of energy (due to friction and air resistance) and theres no external force acting on it (after switch is off)
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Hope this was helpful
decc. = 3/18 2pi per sec. sq.
angle made = 3× 2 pi × 18 - 1/2 (3/18) 2pi 18×18
rev made= 3×18 - 27 = 54-27 = 27 rev
1/7x (7x^2-8y^2)-1/8y (7x^2-8y^2)
in 6 years,
288 × 6 = 1728