Work, Power and EnergyHard
Question
The kinetic energy of a particle continuously increase with time. Then
Options
A.the magnitude of its linear momentum is increasing continuously.
B.its height above the ground must continuously decrease.
C.the work done by all forces acting on the particle must be positive .
D.the result ant force on the particle must be parallel to the velocity at all times.
Solution
For (A) p = 
if K ↑ then p ↑
For (B) Its height may ↑ or ↓
For (C) W = ᐃK if ᐃK = positive then W = positive
For (D) The resultant force on the particle must be at angle less than 90o at all times.
if K ↑ then p ↑For (B) Its height may ↑ or ↓
For (C) W = ᐃK if ᐃK = positive then W = positive
For (D) The resultant force on the particle must be at angle less than 90o at all times.
Create a free account to view solution
View Solution FreeMore Work, Power and Energy Questions
The graph between kinetic energy EK and velocity V is -...The bob (mass m) of a simple pendulum of length L is held horizontal and then released. It collides elastically with a b...A uniform chain of length L and mass M is lying on a smooth table and of its length is hanging down over the edge of the...A man can see only between 75 cm and 200 cm. The power of the lens to correct the near point will be :-...Light of wavelength 0.6 μm from a sodium lamp falls on a photocell and causes the emission of photoelectrons for wh...