Express joule in terms of erg.

Numerical

Relation between joule and erg :
1 joule = 1N × 1m
But 1N = 10⁵ dyne and 1m =100 cm = 10² cm
Hence, 1 joule = 10⁵ dyne × 10² cm
= 10⁷ dyne × cm

= 10⁷ erg

Thus, 1 Joule = 10⁷ erg.

shaalaa.com

Is there an error in this question or solution?

Chapter 2: Work, Energy and Power - EXERCISE - 2(A) [Page 28]

Chapter 2 Work, Energy and Power
EXERCISE - 2(A) | Q 15. | Page 28

Define 1 joule of energy.

A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.

Explain degradation of energy by taking two examples of your daily life.

Its moment of a force scalar or a vector quantity?

A uniform circular motion is an accelerated motion. Justify it.

Define 'joule'.

State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.

Mention whether work is done or not in the following activity.

A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.