The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 0.80 m/s2
B) 9.8 m/s2
C) 4.9 m/s2
D) 1.6 m/s2
E) 2.8 × 106 m/s2
D
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A single force is acting on an object. Which type of motion is not physically allowed?
A. the object speeds up B. the object is at rest C. the object slows down D. the object's motion changes direction
When humans get hot, they sweat in order to reduce their body temperature. Which of the key properties of life is this an example of?
A) growth and development B) reproduction C) response to environment D) order
A flashlight bulb typically has a small metallic button at one end, and this button is surrounded by ceramic material. The chief purpose of the ceramic material is to
A. provide a conducting path to the filament. B. insulate the metal button from the other contact point. C. shut the filament off if the current gets too high. D. provide extra mass at the bottom of the bulb.
A camera records what type of image?
A. Virtual only B. Real or virtual C. Real only D. Electronic