Contrast dark matter and dark energy with respect to their roles in the future of the universe
What will be an ideal response?
Dark matter exerts a gravitational influence that should slow down the universe's expansion, but dark energy seems to be accelerating the expansion instead.
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Which of the following information is required to compute the mass of a galaxy using the rotation curve method?
A) The age of the galaxy B) The distance of the galaxy from the nearest rich galaxy cluster C) The total number of stars in the galaxy D) The true sizes of the orbits of stars or gas clouds within the galaxy
A wheel is spinning on an axle. The linear velocity of a point on the rim is simply the product of the radius times the rotational velocity, as long as the rotational velocity is measured in units of
A. deg/min. B. rad/s. C. deg/s. D. rev/s. E. rev/min.
A 4.0-mF capacitor is discharged through a 4.0-k? resistor. How long will it take for the capacitor to lose half its initial stored energy?
A) 9.2 s B) 2.7 s C) 10.2 s D) 5.5 s E) 1.6 s
If you connect two identical storage batteries together in series ("+" to "-" to "+" to "-"), and place them in a circuit, the combination will provide
A) zero volts. B) twice the voltage, and different currents will flow through each. C) twice the voltage, and the same current will flow through each. D) the same voltage, and different currents will flow through each. E) the same voltage, and the same current will flow through each.