If 50 kJ of heat flows into a system and 35 kJ of work is done by the system, then what is the change in internal energy?

A. 85 kJ
B. 70 kJ
C. 65 kJ
D. 15 kJ
E. 10 kJ


D. 15 kJ

Physics & Space Science

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The Moon keeps one side facing the Earth because it doesn't rotate on its axis

Indicate whether the statement is true or false

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In what way(s) has Pluto long been known to be different from the planets?

A) Its orbit is more inclined to the ecliptic plane. B) It is composed primarily of ices. C) It is far smaller than the terrestrial planets. D) It has a highly eccentric orbit. E) All of the above

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Two pairs of sunspots appear similar, but if one was observed in 1990, and the next in 2002, we would note what difference?

What will be an ideal response?

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An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)

A) 2.2 × 107 m/s B) 1.9 × 107 m/s C) 1.9 × 106 m/s D) 3.0 × 107 m/s E) 0.80 × 107 m/s

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