Question

2.
A 10 kg mass falls through 25 m on to ground and bounces to a height of 0.50 m. Assume that all
potential energy lost is used in heating up the mass. The temperature rise will be (specific heat of the
material is 252 J kg' K')
[ ]
a) 0.95 K
b) 0.092 K
c) 0.0095 K
d) 9.5 K​

Answer 1

c)

The quantitative relationship between heat transfer and temperature change contains all three factors: Q = mcΔT, where Q is the symbol for heat transfer, m is the mass of the substance, and ΔT is the change in temperature. The symbol c stands for specific heat and depends on the material and phase. The specific heat is the amount of heat necessary to change the temperature of 1.00 kg of mass by 1.00ºC. The specific heat c is a property of the substance; its SI unit is J/(kg ⋅ K) or J/(kg ⋅ ºC). Recall that the temperature change (ΔT) is the same in units of kelvin and degrees Celsius. If heat transfer is measured in kilocalories, then the unit of specific heat is kcal/(kg ⋅ ºC).