The rectangular coordinates of a point are (5.00, y) and the polar coordinates of this point are (r, 67.4°). What is the value of the polar coordinate r in this case?
a. 1.92
b. 4.62
c. 12.0
d. 13.0
e. More information is needed.
D
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When light travels from air into water, what happens to the speed of the wave?
A. Nothing, the speed of light is always constant. B. It depends on the angle of the light. C. The speed increases. D. The speed decreases.
A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x1 = 2.0 m and another point x2 = 5.0 m because of this charge?
A) - 11 × 103 V B) 11 × 103 V C) - 33 × 103 V D) 33 × 103 V E) 0 V
Almost all of the complex molecules found in space are based on ________ atoms
A) hydrogen B) iron C) carbon D) oxygen E) silicon
A toy rocket is launched vertically from ground level at time t = 0 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 49.0 m and acquired an upward velocity of 60.0m/s The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The maximum height reached by the rocket is closest to A) 221 m. B) 209 m. C) 244 m. D) 233 m. E) 256 m.