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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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.
The gravitational force in a molecular cloud depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) thermal pressure.