Which of the following is not one of the three main categories of observation generally used by astronomers?
A) filtering to look at just a single color from an object
B) timing to track how an object's brightness varies with time
C) spectroscopy to spread an object's light into a spectrum
D) imaging to get a picture of an astronomical objects
A
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Doubling the current, number of turns, the area, and the ambient magnetic field for a coil changes the maximum torque it experiences by what factor?
A. 2 B. 4 C. 8 D. 16 E. 32
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A) It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. B) You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. E) When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2.
How was Pluto's surface mapped?
A) by mapping with the New Horizons spacecraft B) by measuring the change in brightness as Charon eclipsed Pluto C) by imaging with the Hubble Space Telescope D) by imaging with powerful ground based telescopes E) Pluto is too far away for its surface to be mapped.
The capacitors are completely discharged in the circuit shown below
The two resistors have the same resistance R and the two capacitors have the same capacitance C. After the switch is closed, the current
a.
is greatest in C1.
b.
is greatest in C2.
c.
is greatest in R1.
d.
is greatest in R2.
e.
is the same in C1, C2, R1 and R2.