An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it use to remove 2000 J of heat from the interior of the house?
A) 105 J
B) 130 J
C) 780 J
D) 520 J
E) 340 J
B
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The asteroid belt is found between which two planets' orbits?
a. Earth and Mars b. Mars and Jupiter c. Jupiter and Saturn d. Venus and Earth
Sunspots are cooler than the surrounding gas in the photosphere because
A) they are regions where convection carries cooler material downward. B) there is less fusion occurring there. C) magnetic fields trap ionized gases that absorb light. D) strong magnetic fields slow convection and prevent hot plasma from entering the region. E) magnetic fields lift material from the sunspot and quickly cool the material.
Compared to other systems for generating electrical energy, nuclear energy is relatively unsafe
What will be an ideal response?
When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), an alpha particle is emitted
Indicate whether the statement is true or false