Unit-5
ROTATIONAL AND CIRCULAR
NUMERICAL QUESTIONS
If the plate microwave oven has a radius of 0.15 m and rotates at 6.0
rev/min, calculate the total distance traveled by the fly during a 2.0
min cooking period.
(11m)
A circular drum of radius 40 cm is initially rotating at 400
revolution/min. It is brought to stop after making 50 revolutions. What
is the angular acceleration and the stopping time? (2.79 rad /s', 15.0s)
A string 1m long is used to whirl a 100g stone in a horizontal circle at a
speed of 2ms'. Find the tension in the string.
(T=0.4N)
The moon revolves around the earth in almost a circle of radius 382400km
in 27.3 days. What is the centripetal acceleration? (a = 0.00271 ms)
A modern F1 car can accelerate from 0 to 62 mile/h (100km/h) in 2.50 s.
What is the angular acceleration of its 170 mm-radius wheels?
(65.17 rads)
An electric motor is running at 1800 rev min'. It
to rest in 205
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