Question

calculate and compare the chemical energy of coal to its gravitational potential energy. Burning 1 kg of coal releases about 3 million joules of energy. if you could use all of the chemical energy to lift another kilogram of coal, how could you lift it?

Answer 1

Step-by-step explanation:

1 kg of coal releases 3 million joules of energy

energy released = 3 x 10⁶ Joules

This energy will be in the form of chemical energy .

This energy is being used ti lift 1 kg of coal . Let height attained be h .

Gravitational potential energy of coal at height h = mgh where m is mass of the coal , g is gravitational acceleration .

chemical energy = gravitational energy

mgh = 3 x 10⁶

1 x 10 x h = 3 x 10⁶

h = 3 x 10⁵ m

= 300 x 10³ m

= 300 km .

so , 1 kg coal can be lifted by 300 km .