How did Galileo know that the planets go around the sun rather than around Earth?
A) From telescopic observations of the phases of Venus as it moves around the sun.
B) From telescopic measurements of the positions of the stars as Earth moved around the sun during the course of one year.
C) From the writings of Aristarchus, the ancient Greek astronomer.
D) By noting that Venus always lies near the sun, as seen from Earth, from which he concluded that Venus must be orbiting the sun.
E) From measurements of the tides raised by the moon as compared with the tides raised by the sun.
A
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What would be the weight of a 59.1-kg astronaut on a planet with the same density as Earth and having twice Earth's radius?
A) 290 N B) 580 N C) 2320 N D) 1160 N E) 1200 N
The region of our solar system between Mercury and Mars has very few asteroids, while the region between Mars and Jupiter has many asteroids
Based on what you have learned, what is the most likely explanation for the lack of asteroids between Mercury and Mars? A) There were very few planetary leftovers in this region, because most of the solid material was accreted by the terrestrial planets as the planets formed. B) It was too hot for asteroids to form in this part of the solar system. C) Gravity was too weak to allow asteroids to form in this part of the solar system. D) All the asteroids that formed between Mercury and Mars later migrated to the asteroid belt between Mars and Jupiter.
A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place? A) 13° B) 0.38° C) 17° D) 68° E) 22°
A certain camera uses a double-convex lens made of glass with an index of refraction of 1.60. This lens has a radius of curvature of magnitude 12 cm for the first surface and one of magnitude 24 cm for the second surface
What is the focal length of this lens?