What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 0.65 cm B) 0.65 mm C) 0.0325 mm D) 0.065 mm E) 0.325 mm
B
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Waves on a String: When a certain string is under tension T, the speed of a wave in the string is v. What will be the speed of a wave in the string if the tension is increased to 2T without changing the mass or length of the string?
A. v/2
B. v/
C. v
D. 2v
E. 4v
A top is set spinning so that the rotation is counterclockwise around its axis when viewed from above. When the top is placed on a level surface it happens that its axis of rotation is not quite vertical. Viewed from above, which way does the rotational axis of the top precess?
a. clockwise b. counterclockwise c. It's random, if it starts clockwise it will continue clockwise, and vice versa, i.e., a 50% chance either way. d. The direction depends on the little shove given to the axis when the top is placed on the surface. e. In the northern hemisphere it will be clockwise, in the southern hemisphere it will be counterclockwise.
The period of oscillation of a near-Earth satellite (neglecting atmospheric effects) is 84.3 min. What is the period of a near-Moon satellite? (RE = 6.37 × 10^6 m; RM = 1.74 × 10^6 m; ME = 5.98 × 10^24 kg; MM = 7.36 × 10^22 kg.)
a. 6.03 × 10^-3 min. b. 0.713 min. c. 84.3 min. d. 108 min. e. 140 min.
The beta emission process results in the daughter nucleus differing in what manner from the parent?
a. Atomic mass changes by one. b. Atomic number changes by two. c. Atomic number changes by one. d. Atomic mass changes by two.