If an electromagnetic wave has components Ey = E0 sin(kx - ?t) and Bz = B0 sin(kx - ?t) , in what direction is it traveling?
A) +x B) +y C) -y D) +z E) -x
A
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Convert a speed of 4.50 km/h to units of ft/min. (1.00 m = 3.28 ft)
A) 0.246 ft/min B) 82.3 ft/min C) 246 ft/min D) 886 ft/min E) 165 ft/min
Waves on a particular string travel with a velocity of 10 m/s. A high-speed photograph shows that successive peaks are 0.40 m apart along the string. The frequency of the waves is
A. 25 Hz. B. 15 Hz. C. 20 Hz. D. 5 Hz. E. 10 Hz.
Free Fall: A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s?
A. 7.0 m/s B. 14 m/s C. 21 m/s D. 64 m/s
The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satellite's weight at the altitude of its orbit?
A) 61 N B) 110 N C) 9000 N D) 16,000 N