Why is it important that the James Webb Space Telescope will be operating in the infrared?
A) It will allow us to study the highly redshifted light of distant galaxies, enabling us to observe them as they first formed in the early universe.
B) The infrared is not easily visible from Earth's surface.
C) It will allow us to be closer to the most distant galaxies, so we get better pictures.
D) It will allow us to see into other universes that are not visible from Earth's surface.
A
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An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00
Waves on a String: A wire that is 1.0 m long with a mass of 90 g is under a tension of 710 N. When a transverse wave travels on the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the frequency of this wave?
A. 890 Hz B. 920 Hz C. 1000 Hz D. 1200 Hz E. 1500 Hz
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) neutrinos produced by nuclear fusion drag gas outward B) the strong force between protons C) electromagnetic repulsion between protons D) outward pressure due to super-heated gas
Which of the following causes seasons on Earth?
a. Earth being closer to the Sun during our summer and farther during our winter b. the Sun's varying light output c. the tilt of Earth's axis d. the eleven-year sunspot cycle