Why is Newton's version of Kepler's third law so useful to astronomers?
A) It allows us to calculate distances to distant objects.
B) It can be used to determine the masses of many distant objects.
C) It tells us that more-distant planets orbit the Sun more slowly.
D) It explains why objects spin faster when they shrink in size.
B
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This photo shows an object located in the halo of our Milky Way galaxy. What kind of object is it?
A) a globular cluster of stars B) an open cluster of stars C) a spiral galaxy D) a supergiant star E) a "beehive" cluster
An isolated black hole will
A. eventually suck in all of the universe. B. not change in any way. C. implode due to its own gravity. D. slowly evaporate away through the emission of Hawking radiation.
Graphical Analysis: The graph in the figure shows the velocity of a particle as it travels along the x-axis. What is the magnitude of the average acceleration of the particle between t = 1.0 s and t = 4.0 s?
A. 0.33 m/s2 B. 1.7 m/s2 C. 2.0 m/s2 D. 2.5 m/s2 E. 3.0 m/s2
The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg of water in the tank from 15°C to 80°C? (The specific heat of water is 4 186 J/kg°C)