Advertisements
Advertisements
Question
Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity
Advertisements
Solution
We know that kinetic energy K.E. = `1/2 mv^2`
`∴ (2K)/v^2 = 2 (1/2 mv^2)"/"v^2 = m(mass)`
Hence, the physical quantity obtained is mass and its unit is kilogram (kg)/g/any unit of mass.
APPEARS IN
RELATED QUESTIONS
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
By how much will the kinetic energy of a body increase if its speed is doubled?
What is the kinetic energy of a body of mass 1 kg moving with a speed of 2 m/s?
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
When stored water falls down, potential energy of water is converted into ______.
The kinetic energy of a given body depends on the ______.
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
