A loop lying in the xy plane conducts a conventional current in the direction shown. What is the direction of the magnetic field at each of points a through f?
A. +x direction
B. -x direction
C. +y direction
D. -y direction
E. +z direction
F. -z direction
T. The field is zero.
E. +z direction
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Why was the discovery of Mercury's liquid core a surprise to scientists?
A. Mercury's rotation was too slow to sustain a liquid core. B. Mercury's small size should have allowed it to cool early in its history. C. Mercury's density suggested that there should have been a small solid core. D. Mercury's magnetic field was too weak to be generated by a liquid core.
The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Bell effect. B) the Mach effect. C) the Doppler effect. D) interference. E) diffraction.
Although antimatter is an interesting theoretical idea, there is no evidence that it actually exists
Indicate whether the statement is true or false
The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles
a.
2.9 J
b.
2.6 J
c.
3.1 J
d.
3.4 J
e.
1.6 J