Question

A particle of mass m moves with constant speed v
on a circular path of radius r as shown in figure. The
average force on it during its motion from A to B ls
A
-3.0€
B
13mv2
21tr
mv2
(2)
r
213mv2
(3)
tr
313mv2
(4)
4tr​

Answer 1

Answer:

Themagnitudeofavgforce

F

av

isgivenby

F

av

=

Δt

Δp

v

f

=vcosθ

i

+vsinθ(−

j

)

v

i

=v

j

Δp

=

p

f

−

p

i

=m

v

f

−m

v

i

=mvcosθ

i

+(−mvsinθ−mv)

j

=

2

mv

3

i

−

2

3mv

j

Δp

=mv

4

3

+

4

9

=mv

3

Δt=(

v

2πr

)

3

2

F

av

=

(

v

2πr

)

3

2

mv

3

=

4π

3

3

r

mv

2