How can astronomers measure the composition of an extrasolar planet's atmosphere?
A) by measuring how brightly the planet glows in infrared light
B) by measuring the Doppler shift of the host star
C) by comparing spectra for when the planet is in transit or eclipse with spectra taken at other times
D) by measuring the composition of the host star; the planet must have formed from the same initial material
C
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If the Earth and all things on the Earth are continually radiating energy, why doesn't everything get progressively colder?
What will be an ideal response?
What must be used to maintain the optics and operation of an infrared telescope?
a. filters b. lasers c. coolant d. oxygen e. tertiary mirrors
Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force that acts on the charge at the origin? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) What will be an ideal response?
A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2. (a) How long after beginning to accelerate does it take the car to move 3.50 km? (b) How fast is the car moving just as it has traveled 3.50 km?
What will be an ideal response?