Would it be more efficient to warm your bed on a cold night with a hot water bottle that contains 1 kg of water at 50 degrees C? Or with a 1-kg gold bar at 50 degrees C? Why?

Explanation:

Heat necessary to raise the temperature of a substance by unit mass of a given substance by a given amount is known as specific heat.

It is known that relation between heat energy, specific heat, and mass is as follows.

           q =

As the specific heat of water is 4.18 and the specific heat of gold is 0.129 . Since, the specific heat of water is greater than the specific heat of gold.

Therefore, we can conclude that water is more efficient to warm your bed on a cold night with a hot water bottle that contains 1 kg of water at 50 degrees C.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.