Question

for a stone whirled in a horizontal circle with constant speed the acceleration is due to
(a) change in speed
(b) change in direction of velocity
(c) change in magnitude of velocity
(d) both B and D​

Answer 1

c is the correct answer of this question.

Answer 2

Answer:

PHYSICS

A stone tied at the end of a string 80 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 14 revolutions in 14s, what is the magnitude of acceleration of the stone?

ANSWER

Frequency, f=

14

14

=1 Hz

Angular velocity, ω=2πf=2π rad/s

Acceleration of stone, a=ω

2

r=4π

2

×0.8=31.6m/s

2

Hence, the correct option is (B)