A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the force that the string exerts on the cylinder? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3
A) 2.5 N
B) 20 N
C) 24 N
D) 34 N
E) 40 N
D
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The upper right corner of the Hertzsprung-Russell diagram has:
A. all the white dwarfs B. the coolest and least luminous stars C. the hottest and most luminous stars D. the coolest and most luminous stars E. the hottest and least luminous stars
Where would you most likely find a large radio telescope?
a. in a busy, populated area b. at the peak of a mountain c. on top of a tall building d. in a mountain valley e. near multiple radio towers
A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A) -6.0 cm B) -7.5 cm C) -13 cm D) +18 cm E) +6.0 cm
The energy that warms Earth's surface comes primarily in the form of __________.
a. ultraviolet light from the Sun b. visible light from the Sun c. heat from the Sun d. heat from Earth's interior e. infrared light from the Sun