Astigmatism is due to too flat a cornea
a. True
b. False
Indicate whether the statement is true or false
False
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At the North Pole, the vernal equinox Sun ________.
A. circles the pole along the horizon B. is directly overhead for the entire day C. circles the pole 23.5 degrees below the horizon D. circles the pole 23.5 degrees above the horizon E. rises north of east and sets north of west
Mercury and the Moon are probably the least-habitable bodies in the solar system because they
A) are unlikely to have liquids anywhere B) have never had carbon compounds on their surfaces C) do not have atmospheres containing oxygen D) do not receive any sunlight
A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the y axis?
a. 275 kg•m2 c. 176 kg•m2 b. 90 kg•m2 d. 99 kg•m2
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
a. 2.0 A b. 1.0 A c. 3.0 A d. 9.0 A e. 1.5 A