A Cessna aircraft has a lift-off speed of 135 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 260 m?
a. 2.70 m/s2
b. 1.35 m/s2
c. 3.38 m/s2
d. 5.41 m/s2
e. 2.03 m/s2
a
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Exhibit 17-3Four wave functions are given below. I.y(x, t) = 5sin(4x- 20t + 4) II.y(x, t) = 5sin(3x- 12t + 5) III.y(x, t) = 5cos(4x + 24t + 6) IV.y(x, t) = 14cos(2x- 8t + 3)Use this exhibit to answer the following question(s). Refer to Exhibit 17-3. Rank the wave functions in order of the magnitude of the wave speeds, from least to greatest.
A. IV, II, I, III B. IV = II, I, III C. III, I, II, IV D. IV, I, II, III E. III, IV, II, I
Approximately what proportion of people in the United States believe we have been visited by extraterrestrials?
A) around 33% or a third B) about 50% or a half C) less than 1% D) more than 90%
Two electric charges +Q and -Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would
A) be a relative maximum. B) be a relative minimum. C) be neither a relative maximum nor a relative minimum. D) oscillate between being a relative maximum and a relative minimum.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating clockwise and then counterclockwise.