How much energy must be removed from a 500 g block of ice to cool it from 0∘c to -25 ∘c? the specific heat of ice is 2090 jkg⋅k?

The energy that must be removed from a substance in order to decrease its temperature by  is given by

where
m is the mass of the substance
is its specific heat capacity
is the variation of temperature

In our problem, m=500 g=0.5 kg,  and the variation of temperature is

which corresponds to 25 K, since the differences in temperature are equals in Kelvin and Celsius. Therefore, the amount of energy that must be removed from the block of ice is

where the negative sign means the energy is removed from the system.

Amethod of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force