Q. 75.0( 2 Votes )
An iron sphere of mass 30 kg has the same diameter as an aluminum sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same:
C. potential energy
D. kinetic energy
Mass of iron m = 30 kg
Mass of aluminium M = 10.5 kg
Height of iron h = 10m
Height of aluminum H = 10m
Kinetic energy = m v2
Potential energy = m × g × h
Momentum = mass × velocity
So kinetic energy, potential energy, kinetic energy and momentum depends of the mass of the body, they can’t be same for both spheres.
But acceleration due to gravity g = 10 ms-2 is same for all the objects at some height, irrespective of their mass and height.
Rate this question :
An object of mass 5 kg falls from a height of 5 m above the ground. The loss of potential energy of the mass is :Evergreen - Science
Water stored in a dam possesses:
A. No energy
B. Electrical energy
C. Kinetic energy
D. Potential energyLakhmir Singh & Manjit Kaur - Physics
A car is accelerated on a leveled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car:
A. Does not change
B. Becomes twice that of initial potential energy
C. Becomes 4 times that of initial potential energy
D. Becomes 16 times that of initial potential energy.Lakhmir Singh & Manjit Kaur - Physics
Fill in the following blanks with suitable words:
(a) Work is measured as a product of ……… and ……………..
(b) The work done on a body moving in a circular path is ………………
(c) 1 joule is the work done when a force of one ……………..moves an object through a distance of one …………… in the direction of ……………….
(d) The ability of a body to do work is called ………. . The ability of a body to do work because of its motion is called ………..
(e) The sum of the potential and kinetic energies of a body is called ………… energy.Lakhmir Singh & Manjit Kaur - Physics
Write true or false for the following statements :
When an arrow is released from a bow, potential energy changes into kinetic energy.Evergreen - Science
Find the energy possessed by an object of mass 10 kg when it is at a height of 6m above the ground. [g = 9.8 ms-1]Together with Science
An object of mass 1 kg has a potential energy of 1 joule relative to the ground when it is at a height of :Evergreen - Science
To what height should a body of mass 5 kg be raised so that its potential energy is 490 J? [g = 9.8 m/s2]Together with Science