Monitoring comments on a website is considered wrong.
Answer the following statement true (T) or false (F)
False
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A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3×10^13 km and 1 year is equal to 3.15×10^7 seconds.)
a. 240 years b. 790,000 years c. 96,000 years d. 960 years e. 24,000 years
Imagine placing a magnet in a uniform magnetic field (a field whose vectors have the same magnitude and direction at all points). Will the field exert a net force on the magnet (that, is, a force that causes the magnet’s center of mass to accelerate)? If so, in what direction? (Hint: Use the dipole analogy.)
A. Yes, in the direction of the magnetic field. B. Yes, opposite to the magnetic field’s direction. C. Yes, in a direction perpendicular to the magnetic field. D. Yes, in a direction that depends on the magnet’s orientation relative to the field. E. No, the net force on the magnet is zero.
What happens to light passing through even thin clouds of dust?
A) The light that passes through them is blueshifted due to the cloud's approach. B) Its motion causes all light to be redshifted as it passes through these clouds. C) Its motion causes the light of stars beyond to twinkle. D) Even a little can completely block all light, such as the Horsehead Nebula. E) It dims and reddens the light of all more distant stars.
Humans’ use of rocks and minerals as building materials is an example of which interaction?