Some amount of heat energy is removed from a 9cm X 26cm X 46cm block of ice to cool from 0ºC to -26ºC. (Hint: to find mass, use the relation between, density, mass and volume) Calculate the following: a) The mas of ice cube in grams (density of ice = 920 kg/m3). b) The temperature difference in kelvin b) The energy removed from ice in calories . (specific heat of ice = 2093 J/kgºC)

QUESTION 25 The temperature at state A is 20°C, that is 293 K. What is the heat (Q) for process A to D, in MJ (MegaJoules)? (Hint: What is the change in thermal energy and work done by the gas for this process?) Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. p (atm) 5 4 3 2 1 O A D 1 1 2 3 4 B I 5 → V (m³)

A 0.03 kg lead bullet traveling 99 m/s strikes an armor plate and comes to stop. If all of the bullet’senergy is converted to heat that it alone absorbs, what is its temperature change?  Specific Heat Capacity  of the lead is   g = 9.8 m/s2  Calculate to one decimal.

#4. The rate of costing. of as dT dt where T = Q body fig. below, can be expressed = -k (T- Ta) : temperature of the body (ĉ). Te = temperature of the surrounding medium (2) and k = 4 proportiona- 2ty constant (per minste). Thus, this equation (Called Newton's law of Cooling) specifies that the vate of cooling is proportional to the difference in the temperature of the body and of the surrounding medium. a metal ball heated to 80 °C is dropped into water that is held constant at Ta = 20°C, the temperature of the ball changes. as in Time, min 0 5 10 15 20 25 T₁ °C 80 44.5 30.0 2411 21.7 2017 wtilize numerical differentiation to determine dI at each Value of time. plot dI Versus T-Ta and dt employ linear regression to ellalvate k. dt