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
As shown in the diagram a particle is to be carried from point A to C via paths (I), (II) and (III) in gravitational fie...A ball loses 15.0% of its kinetic energy when it bounces back from a concreate wall. With what speed you must throe it v...A uniform cylinder of length L and mass M having cross- sectional area A is suspended, with its length vertical, from a ...A 150 g ball, moving horizontally at 20 m/s was hit straight back to bowler at 12 m/s. If contact with bat lasted for 0....A rod of mass m, uniform cross sectional area A and length L is accelerated by applying force F as shown in figure on a ...