Why are many of the newly detected extrasolar planets called "hot Jupiters"?
A) Their masses and composition are similar to what we would expect if Jupiter were hotter.
B) The planets tend to be detected around more massive, hotter stars than our Sun.
C) Their masses are similar to Jupiter but they are very close to the central star and therefore hot.
D) Their masses are similar to Jupiter but their composition is similar to Mercury.
E) The discovery of other planets is very exciting.
C
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An astronaut at Earth's surface has a mass of 50 kg and a weight of 500 N. If she were floating freely inside a space habitat in remote space, she would have
A) no weight and less mass. B) no weight and the same mass. C) more weight and no mass. D) none of the above
When a formal definition of a planet in the solar system was adopted, Pluto was reclassified as a dwarf planet. What characteristic of planets does NOT describe Pluto?
A) Planets orbit the Sun. B) Planets are approximately spherical. C) Planets have cleared the neighborhood around their orbit. D) Planets orbit in ellipses with low eccentricity. E) Planets orbit in or very near the ecliptic plane.
Gravitational Potential Energy: A projectile is shot straight up from the surface of Earth by means of a very powerful cannon and experiences no appreciable air resistance. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? (G = 6.67 × 10-11 N ? m2/kg2, the radius of Earth is 6.38 × 106 m, and Mearth = 5.97 ? 1024 kg)
A. 355 m/s B. 505 m/s C. 827 m/s D. 710 m/s E. 906 m/s
A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m
The ball makes 2.0 revolutions every 1.0 s. (a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension in the string.