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A jar of tea is placed in sunlight until it reaches an equilibrium temperature of 30.7 ◦C . In an attempt to cool the liquid, which has a mass of 187 g , 130 g of ice at 0.0 ◦C is added. At the time at which the temperature of the tea is 24.6 ◦C , find the mass of the remaining ice in the jar. The specific heat of water is 4186 J/kg · ◦ C . Assume the specific heat capacity of the tea to be that of pure liquid water. Answer in units of g.
A 31 g block of ice is cooled to −63 ◦C. It is added to 524 g of water in an 66 g copper calorimeter at a temperature of 26◦C. Find the final temperature. The specific heat of copper is 387 J/kg · ◦C and of ice is 2090 J/kg · ◦C . The latent heat of fusion of water is 3.33 × 105 J/kg and its specific heat is 4186 J/kg · ◦C . Answer in units of ◦C.
- A jet of water moving at a velocity of 30m/s impinges on a series of vanes moving at 15 m/s. The jet makes an angle 30o to the direction of motion of vanes at entry and leaves the vanes at 60o. Draw the inlet and outlet velocity diagrams and find i) vane angles at inlet and outlet ii) work done per second per Newton of water, and iii) hydraulic efficiency
A solar energy collector has dimension of 1.2m by 2.4m and collects solar energy with about 70% efficiency. The average solar flux is -min 800wm-2 .water enters the collector at 30°C and flows at 2 litre min -1. what is the waters outlets temperature.
gA closed vessel made of brass 4mm thick has a surface area of 0.2m² and contains 5*10-3m2 of hot water. Calculate the temperature diffrence which exists between the inside and outside of the surfaces of the brass vessel if the water is cooling at 1k per second
A 20 gm piece of metal is heated to 150 c and then dropped into an aluminum calorimeter of mass 500gm containing 500gm of water initially at 25 c find the final equilibrium temperature of the system if the specific heat of the metal is 128.100j/kg-k while the specific heat of water is4200j/kg-k
Suppose you are given a one mole of ideal gas, in an initial state p=6 atm, v=3L, and in a clock wise direction, you maneuvered the system reverisbly in a path given by (v-6)2
+(p-6)2 =16 in the pv plane
Deduce the amount of work done by the gas as a result of this process
Find out the change if the internal energy of the gas
Calculate the minimum and maximum temperature attained by the gas during the cycle
The hot water tap of a bath delivers water at 80°c at a rate of 10kg min-1.The cold water tap of the bath delivers water at 20°c at the rate of 20kg min-1. Assuming that both taps are left for 5minutes, calculate the final temperature of the bath water
Up to how many degrees we can heat 5litres of water, the temperature of which is + 20C, using 21 g of pretrol? Q=46 000 000 J/kg c=4200J/kg water. m= 0,021kg petrol m=5kg water. T2=? T1= +20C. Q= q*m= 46 000 000 * 0,021= 966 000 J/kg? And what next
Up to how many degrees we can heat 5litres of water, the temperature of which is + 20C, using 21 g of pretrol? Answer 44C.how? Q=46 000 000 J/kg c=4200J/kg water. m= 0,021kg petrol m=5kg water. T2=? T1= +20C. Q= q*m= 46 000 000 * 0,021= 966 000 J/kg?
