A +2-?C charge is at rest in a magnetic field of 2 T pointing along the +x-axis. What is the force acting on this charge in the magnetic field?
A) -4 ?N
B) +4 ?N
C) -2 ?N
D) +2 ?N
E) 0 N
E
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How can we see through the interstellar medium?
A) by observing in high-energy wavelengths such as X-rays and long wavelengths of light such as radio waves B) by observing only the brightest visible sources C) by using only the biggest telescopes D) by using telescopes above the Earth's atmosphere E) We cannot see through the interstellar medium.
Humans’ use of rocks and minerals as building materials is an example of which interaction?
A gas expands as shown in the graph. If the heat taken in during this process is 1.02 × 106 J and 1 atm = 1.01 × 105 N/m2, the change in internal energy of the gas (in J) is how much?
?
?
a.
?2.42 × 106
b.
?1.40 × 106
c.
?1.02 × 106
d.
1.02 × 106
e.
1.40 × 106
A fixed focus camera has a focal length of 35.0 mm. How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?
A. 0.34 mm B. 0.41 mm C. 0.35 mm D. 0.47 mm