What are coronal holes?
A) regions on the photosphere where magnetic lines poke through, creating the cooler areas of the sunspots
B) areas of the corona where magnetic field lines project into space, allowing charged particles to escape the Sun, becoming part of the solar wind
C) holes in the corona of the Sun that allow us to see the photosphere
D) tunnels in the outer layers of the Sun through which photons can escape more quickly than through the radiation zone
B) areas of the corona where magnetic field lines project into space, allowing charged particles to escape the Sun, becoming part of the solar wind
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The longest wavelengths of visible light are in the color
A. red. B. orange. C. green. D. blue. E. violet.
An interaction between a large and a small elliptical galaxy that results in a large spiral and a small elliptical galaxy takes:
A) several thousand years. B) several hundred thousand years. C) several million years. D) several hundred million years. E) several billion years.
The energy from the sun is created by
A. Nuclear fission B. Nuclear fusion C. Light waves
An airplane of mass 1.7 × 10^4 kg tows a glider of mass 0.9 × 10^4 kg. The airplane propellers provide a net forward thrust of 4.0 × 10^4 N. What is the glider's acceleration?
a. 1.5 m/s2 b. 2.4 m/s2 c. 5.0 m/s2 d. 4.4 m/s2 e. 9.8 m/s2