Which of the following physical parameters is NOT under the control of a radio telescope?
A) the direction pointed on the sky
B) the bandwidth
C) the time of observation
D) the band
B
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The gravitational force in a molecular cloud depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) thermal pressure.
Which is Saturn's largest satellite?
a. Ganymede b. Enceladus c. Phoebe d. Titan e. Callisto
Energy in Nuclear Reactions: An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A. 1.21 × 10-12 pm B. 1.73 pm C. 2.42 pm D. 3.07 pm E. 3.46 pm
Alex throws a .15kg rubber ball. The speed just before impact is 6.5 m/s and just after impact is 3.5 m/s. What is the change in the magnitude of the ball's momentum
A. 0.09 kg*m/s B.1.5 kg*m/s C. 4.3 kg*m/s D. 4.3 kg*m/s I can't figure out a formula or how to solve.