A spring with a spring constant of 2500 N/m. is stretched 4.00 cm. What is the work required to stretch the spring?
A)
4.00 J
B)
0 J
C)
1.00 J
D)
3.00 J
E)
2.00 J
E
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Wendy measures a recession velocity for two distant galaxies, well outside our Local Group of galaxies. Galaxy A has a recession velocity of 35,000 km/s and Galaxy B has a recession velocity of 70,000 km/s
What can she say about the distances to those galaxies? A) She can't say anything about the distances to Galaxy A or B. B) Galaxy A is twice as far as Galaxy B. C) Galaxy B is four times as far as Galaxy A. D) Galaxy B is twice as far as Galaxy A. E) Galaxy A is four times as far as Galaxy B.
Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals,
in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s) A) 5.1 min B) 3.8 min C) 6.4 min D) 7.7 min E) 8.9 min
Which of the following statements about various stages of core nuclear fusion (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage lasts for approximately the same amount of time. B) As each stage ends, the core shrinks and heats further. C) Each successive stage creates an element with a higher atomic number and atomic mass number. D) As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
A component in an automobile 12-V electrical system has a resistance of 20 ?
a. How much current is in the component when the system is in operation? b. How much energy is dissipated by the component each second?