A comet is observed to pass 
m from the surface of the sun. The sun’s radius is 
m. What is the speed of the comet at this point, if its speed when passing the Earth’s orbit, 
m from the sun’s center, is 25km/s?
A. 561 km/s
B. 618 km/s
C. 562 km/s
D. 585 km/s
A. 561 km/s
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The magnetic force on a charged particle is always:
a. perpendicular to the particle's velocity. b. in the direction of the particle's velocity. c. absent for moving particles. d. parallel to the particle's velocity. e. in the opposite direction to the particle's velocity.
The most violent volcanic eruption in recorded history was that of
a. Paracutin. b. Mount Saint Helens. c. Tambora. d. Mount Pelée.
Two concentric conducting spherical shells produce a radially outward electric field of magnitude 49,000 N/C at a point 4.10 m from the center of the shells. The outer surface of the larger shell has a radius of 3.75 m
If the inner shell contains an excess charge of -5.30 ?C, find the amount of charge on the outer surface of the larger shell. (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
Observing Galilean moons: The Galileo spacecraft launched towards Jupiter carried a small telescope (about 25 cm diameter) for collecting visible light images
Explain why these collect images with much better spatial resolution than even the largest Earth-bound telescopes (for example, the 10 meter Keck telescopes).