A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30,
and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
2.1 m/s
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Three resistors connected in series each carry currents labeled I1, I2, and I3 . Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?
a. IT = I1 + I2 + I3 c. IT = (1/I1 + 1/I2 + 1/I3) b. IT = (1/I1 + 1/I2 + 1/I3)-1 d. IT = I1 = I2 = I3
Spherical Mirrors: If an object is placed at the center of curvature of concave mirror, the image formed by the mirror is located
A. out beyond the center of curvature. B. at the center of curvature. C. between the center of curvature and the focal point. D. at the focal point. E. at infinity.
Suppose you are sitting in a closed room that is magically transported off Earth so that, as shown in the diagram, you are accelerating through space at 9.8 m/s2. According to the equivalence principle, how will you know that you've left Earth?
A) You won't know that you've left Earth. B) by looking out the window C) by the fact that you'll become weightless D) by the fact that you'll feel yourself pressed harder against the floor
In the equation: Number of Civilizations = Np × flife × fcivilization × fnow what do we mean by fnow?
A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us