A sample of material of mass M M\,M is heated by an electric heater of constant power HHH. The graph of temperature T T\,T against time t t\,t for this sample is shown below.
The gradient of this straight-line graph is SSS. Assuming no heat loss to the surroundings, which of the following is the correct expression for the specific heat capacity c c\,c of the material?
c=HSMc = \frac{H S}{M}c=MHS
c=HMSc = \frac{H}{M S}c=MSH
c=MSHc = \frac{M S}{H}c=HMS
c=MHSc = \frac{M H}{S}c=SMH