You fill an insulated mug with 360 g of coffee at 99 °C. How many grams of ice at -10 °C should you put into the mug if you want your coffee to reach a temperature of 94 °C at equilibrium? Estimate coffee as water, and assume the coffee exchanges negligible energy with its environment during this process. (12
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- You wish to chill 12 cans of soda at 25.0 °C down to 5.0 °C beforeserving them to guests. Each can has a mass of 0.354 kg, and thespecific heat of soda is the same as that of water. (a) How muchthermal energy must be removed in order to chill all 12 cans?(b) If the chilling process requires 4.0 h, what is the average rate(in W) at which thermal energy is removed from the soda?An automobile has a mass of 1 500 kg, and its aluminum brakes have an overall mass of 6.00 kg. (a) Assuming all the internal energy transformed by friction when the car stops is deposited in the brakes and neglecting energy transfer, how many times could the car be braked to rest starting from 25.0 m/s before the brakes would begin to melt? (Assume an initial temperature of 20.0°C.) (b) Identify some effects that are neglected in part (a), but are likely to be important in a more realistic assessment of the temperature increase of the brakes.Q:33)
- (g) A thin, 1.44-kg slab of copper at 18.0°C is set sliding at 2.90 m/s over an identical stationary slab at the same temperature. Friction quickly stops the motion. Assuming no energy is transferred to the environment by heat, find the change in temperature of both objects. (Assume the specific heat of copper is 387 J/kg · °C.) ΔΤ. sliding slab The correct answer is not zero.°C ΔΤ. stationary slab The correct answer is not zero.°C (h) Evaluate Q and AE, int for the sliding slab and AE, 'mech for the two-slab system. ΔΕ , int ΔΕ. mech (i) Evaluate Q and AE, int for the stationary slab. ΔΕ. intWhat mass of water ice at −12° C must be added to 0.830 kg of liquid water that is initially at a temperature of 77.0° C, to produce all liquid water at a final temperature of 20.0° C ? The entire system is sealed inside an ideal calorimeter.(a) What is the rate of energy loss in watts per square meter through a glass window 2.4 mm thick if the outside temperature is -5.1°F and the inside temperature is +70°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 5.9 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m.K.) (a) Number i (b) Number Units Units
- (a) What is the rate of energy loss in watts per square meter through a glass window 2.4 mm thick if the outside temperature is -7.8°F and the inside temperature is +81°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.0 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m-K.) (a) Number i (b) Number i Units Units(a) How much heat transfer (in kcal) is required to raise the temperature of a 0.650 kg aluminum pot containing 3.00 kg of water from 10.0°C to the boiling point and then boil away 0.600 kg of water? X kcal Enter a number. (b) How long (in s) does this take if the rate of heat transfer is 600 W (1 watt = 1 joule/second (1 W = 1 J/s))?How much liquid water, initially at temperature 19.0°C, can a freezer rated at 350.0 Watts and with a COP of 5.30 cool and freeze into ice at 0.00°C in 30.0 minutes? Assume that all energy as heat removed from the appliance's cold compartment is removed from the water. Please enter the answer in units of kilograms [kg].