Suppose that you have left a 200-ml cup of coffee sitting until it has cooled to 30∘c , which you find totally unacceptable. your microwave oven draws 1100 w of electrical power when it is running. if it takes 45 s for this microwave oven to raise the temperature of the coffee to 60∘c , what is the efficiency of heating with this oven?
Answers: 2
specific heat 
mass of coffee, 
initial temperature of coffee, 
final temperature of coffee, 
power rating of oven, 
time taken to reach the final temperature, 
\ J" alt="\eta=\frac{25116}{49500}" />\ J" />
Another question on Physics
Physics, 21.06.2019 15:30
Which of the following statements are true of solids? a.the particles do not vibrate. b.the particles are in a fixed location. c.they have strong intermolecular forces between the atoms or molecules. d.the particles have less kinetic energy than those of liquids or gases.
Answers: 1
Physics, 21.06.2019 23:00
The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m
Answers: 1
Physics, 22.06.2019 08:30
Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2
Answers: 3
Physics, 22.06.2019 10:30
An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.
Answers: 2
You know the right answer?
Suppose that you have left a 200-ml cup of coffee sitting until it has cooled to 30∘c , which you fi...
Questions
Mathematics, 24.05.2021 14:00
Computers and Technology, 24.05.2021 14:00
Chemistry, 24.05.2021 14:00
Mathematics, 24.05.2021 14:00
Business, 24.05.2021 14:00
Computers and Technology, 24.05.2021 14:00
Biology, 24.05.2021 14:00
