Tuesday
November 25, 2014

Homework Help: Physics

Posted by Steve on Sunday, December 5, 2010 at 7:04pm.

Assume the optimal coffee drinking temperature is 75C, and further assume coffee has the same heat capacity and density as water.

a. How much energy is required to raise the temperature of 1 cup (0.237 liters) of coffee initially at 25C to the optimal temperature?

b. How much energy is required to heat the coffee to 95C?

c. The coffee is cooled back down so that the mixture of coffee and melted ice has the optimal temperature. If the ice started at ‐3C, what mass (m=?) of ice is required?

d. If the water used to make the ice started at 25C, how much energy was required to freeze it and cool the ice to ‐3C in the first place?

e. How much energy was wasted by overheating the coffee? This will be the overheating energy, plus the energy to make the ice, less the energy to heat it to the optimal temperature. What is the ratio of wasted energy to useful energy?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chem211 - A chemistry professor has a cup of coffee containing 50.0mL of room ...
Chemistry - At a local convenience store, you purchase a cup of coffee, but, at ...
Chemistry - Suppose that the microwave radiation has a wavelength of 12.4 cm. ...
chemistry - Suppose that the microwave radiation has a wavelength of 10.8 cm. ...
CHEM - Suppose that the microwave radiation has a wavelength of 10.8 cm. How ...
chem - Suppose that the microwave radiation has a wavelength of 10.8cm . How ...
Chemistry please help - Suppose that the microwave radiation has a wavelength of...
chemistry - Suppose that the microwave radiation has a wavelength of 10.8 cm. ...
Chemistry/Calorimetry - You buy coffee (200.0 ml) served in a styrofoam cup. You...
Chemistry - A professor orders 250 mL of house coffee at precisely 95C. She ...

Search
Members