Which of the following telescopes is best suited for studying the hottest intergalactic gas (10 million K) in a cluster of galaxies?
Which of the following telescopes is best suited for studying the hottest intergalactic gas (10 million K) in a cluster of galaxies?
C) Chandra X-ray Telescope
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An astronaut is in equilibrium when he is positioned 140 km from the center of asteroid X and 581 km from the center of asteroid Y, along the straight line joining the centers of the asteroids. What is the ratio of the masses X/Y of the asteroids?
A) 0.0581 B) 17.2 C) 0.241 D) 4.15
Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) spectroscopy (taking a spectrum) B) imaging (taking a picture) C) timing (measuring how the amount of light changes with time)
A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
A. 11 mA B. 18 mA C. 14 mA D. 22 mA E. zero
The greater the mass of a star, the ______________ it moves through its life cycle
Fill in the blank(s) with correct word