___________ can be used to determine the galaxy's mass if the galaxy is reasonably close so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant
b. A galaxy's color
c. A galaxy's rotation curve
d. A galaxy's diameter
e. The velocity dispersion method
C
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What is the mass of a 1.25 m long piano wire that has a fundamental frequency of 256 Hz when under a tension of 138 N?
A. 6.4 g B. 1.7 g C. 3.4 g D. 41 g E. 4.1 g
The power rating of a resistor is 0.800 W. The value of the resistor is 400 ?. (a) What is the maximum voltage? (b) What is the maximum current it can draw?
What will be an ideal response?
Most nearby stars move relative to the Sun at speeds below about 30 km/s. Suppose you observe a nearby star that is moving much faster than this (say, 300 km/s). Which of the following is a likely explanation for its high speed?
A) It has been pushed to high speed by the shock wave from a nearby supernova. B) It is a very young star, recently formed. C) It is probably a halo star that is currently passing through the disk. D) It is a very high mass star.
A 0.50-kg object is attached to an ideal spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
What are (a) the total energy and (b) the amplitude of vibration of the system?