Neutrinos are created in reactions in the _______ of the Sun
a. corona
b. chromosphere
c. photosphere
d. core
d
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You are somewhere in the solar system. You can see Jupiter high in the sky, and it looks enormous. You can also see numerous nearby volcanoes, some that are currently erupting. Where are you?
A) Mars B) Venus C) Europa D) Io
Thermodynamic Devices: Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?
A. 10% B. 20% C. 25% D. 45% E. 80%
What is the gravitational force between two 20-kg iron balls separated by a distance of 0.5 m? The gravitational constant is G = 6.67 ´ 10-11 N-m2/kg2.
A. 2.67 ´ 10-9 N B. 5.34 ´ 10-9 N C. 5.34 ´ 10-8 N D. 1.07 ´ 10-7 N
A horizontal force of 200 N is applied to a 55-kg cart across a 10 m level surface. If the cart accelerates at 3.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. -900 J c. -350 J b. -175 J d. -700 J