Power: How many joules of energy are used by a 2.0 hp motor that runs for 1.0 hour? (1 hp = 746 W)
Fill in the blank(s) with the appropriate word(s).
5.4 MJ
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You observe a star similar to our own Sun in size and mass. This star moves slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet. What can you conclude about the orbiting planet?
A) The planet must be closer to the star than Earth is to the Sun. B) The planet must have a mass about the same as the mass of Jupiter. C) The planet must be farther from the star than Neptune is from the Sun. D) You do not have enough information to say anything at all about the planet.
At t = 0, a particle is located at x = 25 m and has a velocity of 15 m/s in the positive x direction. The acceleration of the particle varies with time as shown in the diagram. What is the velocity of the particle at t = 5.0 s?
?
?
a.
+15 m/s
b.
?15 m/s
c.
+30 m/s
d.
0
e.
?1.2 m/s
Compared to its neutral atom, an ion has the same number of
A) protons and neutrons B) protons but a different number of neutrons C) protons but a different number of electrons D) neutrons but a different number of protons
What is true of the Local Group?
A) It contains about 2500 galaxies. B) The Andromeda galaxy is a satellite of the Milky Way. C) The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies. D) The giant ellipticals are the largest members. E) It consists of mostly spirals.