Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 mN, what is the greater of the two currents?
a. 0.20 A
b. 0.40 A
c. 40 mA
d. 20 mA
e. 0.63 A
B
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What will be an ideal response?
The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes an angle with the ground. When a force of magnitude F is applied to each box in a direction parallel to the surface it is on, upwards on the box on the ramp, neither box moves. Which statement comparing the friction force on the box on the level, Fs,L, to the friction force on the box on the ramp, Fs,R, is correct?
A. Fs,R = Fs,L. B. Fs,R>Fs,L. C. Fs,R
Which of the following statements about gamma ray bursts is not true?
A) Gamma ray bursts are among the most luminous events that ever occur in the universe. B) The events responsible for gamma ray bursts apparently produce only gamma rays, and no other light that we can hope to detect. C) Gamma ray bursts were originally discovered by satellites designed to look for signs of nuclear bomb tests on Earth. D) Based on their distribution in the sky, we can rule out a connection between gamma ray bursts and X-ray binaries in the Milky Way Galaxy.
A tilted top that is spinning clockwise (when viewed from above) experiences a torque that is always horizontal and perpendicular to the top’s angular momentum. If initially the top’s axis of rotation leans somewhat to the viewer’s right and the torque points toward the viewer, how will the top’s axis of rotation precess around the vertical direction?
A. Clockwise (when viewed from above). B. Counter clockwise (when viewed from above). C. Since the torque is horizontal, there is no precession. D. Since the torque is perpendicular to the top’s angular momentum, there is no precession.