The distinguishing feature of a starburst galaxy is
A) a rate of star formation that may be 100 or more times greater than that in the Milky Way.
B) the presence of an unusually large number of binary star systems containing x-ray bursters.
C) a large luminosity compared to the total luminosity of the Milky Way.
D) strong radio emission from "lobes" of material well outside the visible boundaries of the galaxy.
A) a rate of star formation that may be 100 or more times greater than that in the Milky Way.
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Gravitational Force: ?MassRadiusOrbital radiusOrbital periodMoon A4.0 × 1020 kgunknown2.0 × 108 m4.0 × 106 sMoon B1.5 × 1020 kg2.0 × 105 m3.0 × 108 munknownMithra is an unknown planet that has two moons, A and B, in circular orbits around it. The table summarizes the hypothetical data about these moons. What is the magnitude of the maximum gravitational force that Moon A exerts on Moon B? (G = 6.67 × 10-11 N ? m2/kg2)
A. 1.6 × 1013 N B. 4.4 × 1013 N C. 1.0 × 1014 N D. 2.0 × 1014 N E. 4.0 × 1014 N
An object of mass 8.0 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field
The spring stretches 3.6 cm before it reaches its equilibrium position. If this system is allowed to oscillate, what will be its frequency? A) 2.6 Hz B) 0.0045 Hz C) 0.67 Hz D) 2.1 Hz
A wheel having a moment of inertia of 5.00 kg ? m2 starts from rest and accelerates under a constant torque of 3.00 N ? m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
A) 57.6 J B) 64.0 J C) 78.8 J D) 122 J
The Big Bang
A) took place within space. B) marked the beginning of space and time. C) occurred as a result of disturbances within the Large Magellenic cloud. D) took place within time.