Answer:
84%
Explanation:
2100 j out / 2500 j in = .84 = 84%
Core, radiative zone, convection zone, photosphere, chromosphere, corona.
It is a presumptive test for cocaine.
A calorimeter contains 500 g of water at 25°C.....
the temperature of the water inside the calorimeter is 39.4°C.....
The specific heat of water is 4.18 J/g-°C.
energy needed to heat the water = specific heat * mass * temp difference
= 4.18 J/g-°C * 500 g * (39.4°C - 25°C)
= 4.18*500*14.4
= 30096J
or approx. 30kJ
53.6 hectometer
536 meters
536,00 centimeters