What lucky factor prevented the Chelyabinsk object from causing much damage at ground level?
A) It was made entirely of ices and thus exploded high in the air.
B) It hit Earth at an oblique angle and thus exploded high in the air.
C) A prototype asteroid defense system was being tested nearby.
B
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Which of the following luminosity classes refers to stars on the main sequence?
A) I B) II C) III D) IV E) V
Two point charges of values +3.6 and +6.9 ?C are separated by 0.40 m. What is the electrical potential at the point midway between the two point charges? (ke = 8.99 × 10^9 N?m2/C2)
a. +0.47 MV b. ?0.24 MV c. +0.24 MV d. +0.97 MV e. ?0.47 MV
A solenoid consists of 100 circular turns of copper wire. Parts of three turns, A, B and C, are shown below
When a current flows through the coil,
a.
both A and C are repelled by B.
b.
A is attracted to B; C is repelled by B.
c.
neither A nor C is attracted to or repelled by B.
d.
A is repelled by B; C is attracted to B.
e.
both A and C are attracted to B.
Where would Class Ia be located on the H-R diagram?
a. a line through the giants b. a horizontal line through the supergiants c. along the main sequence d. along the white dwarf line