Question

(4) 21
A particle is moving along a circular path of radi
5 m and with uniform speed 5 ms. What will
the average acceleration when the parti
completes half revolution?
(1) Zero
(2) 10 ms 2
3) 10 ms?
(4) 10/rt ms 2
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Answer 1

HELLO...!!!

The change in velocity when the particle completes half revolution is given by

Dv = 5 m/s – (-5 m/s) = 10 m/s.

Time taken to complete half revolutiont = π r/v = π×5/5 = π

Average acceleration = Δv/Δt

=10/π m/s2.

THANKS....

Answer 2

As the average acceleration is change in velocity over the time taken,

In this case when the half revoultion is over the direction in the speed changes by 180 degrees,

so the change in velocity = 5- (-5) = 10m/s

The time taken to cover this distance = π∗r/5=5π/5=π(as the distance travelled is semicircle)

So, average acceleration = 10/πms-1

Hope it helps!!