What is the temperature difference across a window if the conductive heat flow rate across it is 20 J/s? The window is 4.5 m2 in area that has an R-value of 2.5 m2 °C/W
What will be an ideal response?
We find the rate of heat transfer from
rate of heat transfer = A DT/R = 4.5 m2 x DT/(2.5 m2 °C/W).
This allows us to find DT. We have
DT = R x (rate of heat transfer)/A = (2.5 m2 °C/W) x (20 J/s)/(4.5 m2) = 11.1 °C.
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What will be an ideal response?
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would be the result to be?
a. It would be that of copper since copper is on the outside. b. It would be that of zinc since zinc is in the center. c. It would be the sum of the copper and zinc specific heats. d. It would be between that of copper and that of zinc, depending on coating thickness.
A damped oscillator is released from rest with an initial displacement of 10.00 cm. At the end of the first complete oscillation the displacement reaches 9.05 cm. When 4 more oscillations are completed, what is the displacement reached?
a. 7.41 cm b. 6.71 cm c. 6.07 cm d. 5.49 cm e. 5.25 cm
A __________ is a three dimensional image made using a laser
Fill in the blank(s) with correct word