How much heat energy is required to raise the temperature of 5 kilograms of coal from 20â°c to 220â°c? a) 314 j b) 4,187,000 j c) 1,314,718 j d) 6,573 j

1000 kJ of heat energy is required.

Explanation:

Heat energy required, H = mcΔT, where m is the mass, C is specific heat and ΔT is change in temperature.

Mass of coal, m = 5 kg

Change in temperature, ΔT = 220-20 = 200°C

Specific heat of coal = 1 kJ kg⁻¹°C⁻¹

Substituting

           H = mcΔT = 5 x 1 x 200 = 1000 kJ

1000 kJ of heat energy is required.    

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards