What is the wave speed of a wave traveling an average distance of 6 meters in one second?
A) less than 0.2 m/s
B) 1 m/s
C) 3 m/s
D) 6 m/s
E) more than 6 m/s
Answer: D
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Force on a Wire: A straight wire that is 0.60 m and carrying a current of 2.0 A is placed at an angle with respect to the magnetic field of strength 0.30 T. If the wire experiences a force of magnitude 0.18 N, what angle does the wire make with respect to the magnetic field?
A. 20° B. 25° C. 30° D. 35° E. 60°
Which of the following is fundamentally different from the others?
A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves
Galileo observed all of the following. Which observation offered direct proof of a planet orbiting the Sun?
A) four moons of Jupiter B) patterns of shadow and sunlight near the dividing line between the light and dark portions of the Moon's face C) phases of Venus D) The Milky Way is composed of many individual stars.
A fountain sends water to a height of 50 m. What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2)
a. 1 atm c. 7.2 atm b. 4.9 atm d. 9.8 atm