Acopper ball and an aluminum ball of mass 150 g each are heated to 100°c and then cooled to a temperature of 20°c. the heat lost by the copper ball is 4.6 kj. the heat lost by the aluminum ball is 10.8 kj. what is the specific heat of copper, if the specific heat of aluminum is 0.90 j/g°c?

0.383 J/g°C

Explanation:

The heat emitted by the copper ball while cooling down is given by:

where:

m = 150 g is the mass of the ball

Cs = ? is the specific heat of copper

is the change in temperature

We know that the heat lost by the copper ball is

So we can re-arrange the formula to find the specific heat capacity:

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

the higher the current the higher the mag field around it the higher the influence on the compass