A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is
a. 6.7 × 10^?20 J.
b. 1.0 × 10^?21 J.
c. 1.0 × 10^?20 J.
d. 6.7 × 10^?21 J.
e. 1.3 × 10^?20 J.
d
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Force on a Moving Charge: A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle
A. causes the particle to speed up. B. causes the particle to slow down. C. causes the particle to accelerate. D. is in the same direction as the particle's velocity. E. is opposite the direction of the particle's velocity.
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
We find that 2N current loops are coplanar and coaxial. The first has radius a and current I. The second has radius 2a and current 2I, and the pattern is repeated up to the Nth, which has radius Na and current NI. The current in the loops alternates in direction from loop to loop as seen from above. Thus the current in the first loop is counterclockwise, in the next clockwise, up to the last loop where it is again clockwise. The magnitude of the magnetic field at the center of the loops is
A.
B.
.C.
.D.
.E.
.The ___________of the product is the extent to which the product meets the performance criteria.
Fill in the blank(s) with the appropriate word(s).