Which of the following types of motion cannot describe the motion of a clock’s hands?
a) Rectilinear
b) Circular
c) Periodic
d) Harmonic

Answer

A, B

Explanation

`W=100N, theta=37^0, s=2m`
Force, `F=mgsin37^0`
`=100xx3/5=60N`
So, work done when the force is parallel to incline,
`w=Fscostheta`
`=60xx2xxcos0^0=120'J`

`In /_\ABC, AB=2m`
AC=h`
`s sin 37^0`
`=1.2m`
`:.` Work done when the force in horizontal direction
`w=mgh`
`=100xx1.2=120J`