To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 10^3 kg/m3.)
a. 95%
b. 93%
c. 91%
d. 89%
e. 77%
d
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What is the average power dissipated by a resistor of resistance R = 25 ? in an LRC circuit for which the power factor is equal to 0.25 and the maximum voltage of the AC source is 8 V?
A) 0.04 W B) 0.32 W C) 0.16 W D) 0.62 W E) 0.08 W
In a double slit experiment, a beam of electrons strikes a pair of slits
The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern. What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 8.8 × 10-23 kg ? m/s B) 1.1 × 10-23 kg ? m/s C) 2.2 × 10-23 kg ? m/s D) 4.4 × 10-23 kg ? m/s E) 6.6 × 10-23 kg ? m/s
Newton's Second Law of Motion tells us that the net force applied to an object equals its
A) mass multiplied by acceleration. B) mass multiplied by energy. C) momentum multiplied by velocity. D) mass multiplied by velocity.
For certain angles, TOTAL INTERNAL REFLECTION can occur when light tries to pass from one medium to another which has
A) a larger index of refraction. B) a smaller index of refraction. C) the same index of refraction. D) an index of refraction which is sin-1 (45°). E) an index of refraction which is sin-1 (n).