What phase of the Moon must it be to have a lunar eclipse?
A. full moon
B. first quarter
C. new moon
D. third quarter
full moon
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A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.1 cm cos(2000 rad/s t - 40
x). What is the direction of the disturbance of the wave?
A. the + y direction B. the + z direction C. the - x direction D. the + x direction
Nuclear Binding Energy: The stability of 
C with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. not subject to alpha, beta-plus or beta-minus decay. B. subject to alpha decay only. C. subject to beta-plus decay only. D. subject to beta-minus decay only. E. subject to beta-plus or beta-minus decay, but not to alpha decay.
A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s
The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity
directed to the right. Judd says that the emf induced in the loop is zero. Roger claims that it has magnitude 
. Which one, if either, is correct, and why?
?
?
?
a.
Judd, because the magnetic flux through the loop is constant.
b.
Roger, because the magnetic flux through the loop is constant.
c.
Judd, because the magnetic flux through the loop is not constant if 
.
d.
Roger, because the magnetic flux through the loop is not constant if 
.
e.
Roger, because the magnetic flux through the loop is ?B = 0.