A certain Carnot heat pump transfers energy from the outside of a house, where the temperature is -15°C, to the inside of a room where the temperature is 21°C
If this heat pump runs off of electricity, what is the minimum rate at which it uses electrical energy to deliver 150 W to the inside room?
18 W
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In the BCC metal iron, the (110)-type planes are the most closely packed planes.
(a) Calculate the interplanar spacing between the (110)-type planes. (b) Draw a BCC unit cell and show the (110)-type planes and a [110] direction that is perpendicular to the (110) planes. (c) Calculate the segment lengths where the (110) planes cut the [110] direction.
When Earth was young, its atmosphere had no free ____
a. nitrogen b. oxygen c. helium d. carbon dioxide e. water vapor
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
The study of minerals is called ______________
Fill in the blank(s) with correct word