What maximum velocity does the star attain?
What will be an ideal response?
about 50 m/s
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______________ is the only moon in the solar system to have retrograde motion
a. Ganymede b. Europa c. Callisto d. Titan e. Triton
Process of Science: How do we know what is going on in the center of the Sun so well if we cannot see it or send spacecraft to it?
What will be an ideal response?
Why couldn't Newton determine the value of the gravitational constant?
a. The constant was too large to measure with existing instruments. b. The constant was too small to measure with existing instruments. c. If the gravitational constant were known, the mass of Earth could be calculated. d. Although Newton believed there was a constant, no one has ever discovered one. e. Although the right equipment and techniques for this measurement existed, Newton did not have access to them.
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) 20% B) 10% C) 45% D) 80% E) 25%