Q8 of 55 Page 362

An object of mass 1 kg has a potential energy of 1 joule relative to the ground when it is at a height of :

Given,

Mass m= 1 kg


Potential energy = 1 J


Height h=?


Let g = 9.8 ms-2


We know


Potential energy = m × g × h


Substituting the values in this formula


1 J = 1 kg× 9.8 ms-2 × h


h =


h = 0.102 m

More from this chapter

All 55 →
6

A 1 kg mass has a kinetic energy of 1 joule when its speed is:

 7

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:

 9

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 :

 10

A weightlifter lifts 240 kg from the ground to a height of 2.5 in 3 second. The average power is :