Two spacecraft in outer space attract each other with a force of 20 N. What would the attractive force be if they were one-half as far apart?
A. 5 N
B. 10 N
C. 40 N
D. 80 N
Ans: D. 80 N
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What is the equivalent resistance between points a and b when R = 13 ??
A. 29 ? B. 23 ? C. 26 ? D. 20 ? E. 4.6 ?
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2
Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB
Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest. b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. e. All the charges above experience equal forces when released in the same magnetic field.
S seismic waves can travel only through ______________ material
Fill in the blank(s) with correct word