According to present understanding, a nova is caused by ________
A) carbon fusion in the core of a white dwarf
B) hydrogen fusion on the surface of a white dwarf
C) a white dwarf that gains enough mass to exceed the 1.4-solar-mass limit
D) hydrogen fusion on the surface of a neutron star
B
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What is the correct ordering of galactic components using the new bottom-up hypothesis starting from oldest to youngest?
a. galactic halo, average globular clusters, galactic disk b. galactic halo, galactic disk, average globular clusters c. average globular clusters, galactic halo, galactic disk d. average globular clusters, galactic disk, galactic halo e. galactic disk, average globular clusters, galactic halo.
Estimate Comet Tempel 1's diameter, using the scale bar in the photo.
What will be an ideal response?
According to the equation E = mc2, an object turns into energy when it reaches the speed of light
A) True B) False
A metal sphere of radius 10 cm carries an excess charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm above the sphere's surface? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 4.0 × 105 N/C B) 8.0 × 107 N/C C) 4.0 × 107 N/C D) 8.0 × 105 N/C E) 4.0 × 109 N/C