Given that two forces of 10 N and 15 N act horizontally on an object, the net force must
A) be 5 N.
B) be 25 N.
C) be either 5 N or 25 N.
D) lie between 0 N and 25 N.
Answer: C
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Bar A has one end painted green and the other end red and may or may not be a magnet. A student brings the north pole of a bar magnet M close to the green end of A. He observes that the green end is attracted. He can conclude that
A. A is a magnet and the green end is a south pole. B. A might be a magnet; this observation does not provide enough information to determine whether or not it is. C. A is a magnet and the green end is a north pole. D. A is not a magnet.
Intensity: The rate of energy flow per unit area of an electromagnetic wave has an average value of 0.695 W/m2. The wave is incident at right angles upon a rectangular area measuring 1.5 m by 2.0 m. How much total energy falls upon this rectangle each minute? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 130 J B. 160 J C. 190 J D. 220 J E. 250 J
A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.0 × 106 m/s in the negative x-direction. What is the y component of the force on the electron?
A) zero B) -1.0 x 10^-18 N C) +2.0 x 10^-18 N D) -2.0 x 10^-18 N E) +1.0 x 10^-18 N
At room temperature a crystal of pure titanium is _________close-packed.
Fill in the blank(s) with the appropriate word(s).