Most of the light we see coming from the Sun originates in the ____________________
Fill in the blank(s) with correct word
photosphere
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Ron is standing near a railroad track. A train is moving toward him at 60 mph, and it blows its horn. What will Ron notice as the train moves past him?
A) As the train moves away, the frequency of the horn will be higher than when the train comes closer. B) As the train approaches, the horn will sound higher in pitch than when the train moves away. C) The horn will produce a multiple echo effect as the train moves closer to Ron. D) There will be no change in the pitch of the horn as the train moves past Ron.
The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres
Which of the following situations could the graph plausibly represent? (There may be more than one correct choice.) A) a positively charged conducting sphere within another positively charged conducting sphere B) a positively charged conducting sphere within an uncharged conducting sphere C) a solid nonconducting sphere, uniformly charged throughout its volume, inside of a positively charged conducting sphere D) a positively charged nonconducting thin-walled spherical shell inside of a positively charged conducting sphere E) a positively charged nonconducting thin-walled spherical shell inside of another positively charged nonconducting thin-walled spherical shell
A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes
What is the magnitude of the gravitational force exerted on the satellite by the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is
a. 0 d. 10 m/s2 b. 5 m/s2 e. 20 m/s2 c. 9.8 m/s2