The number of vibrations per second of an electromagnetic wave is referred to as its
A) energy
B) frequency
C) speed
D) wavelength
B
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Most of the injuries caused by the Chelyabinsk event in 2013 were caused by
A) smoke inhalation B) UV radiation from the fireball C) glass shattered by the shock wave D) the sonic boom as the object passed through the Earth's atmosphere
A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125kg.m2 and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string. When the tiles are released, the larger one accelerates downward while the lighter one accelerates upward. The pulley has no friction in its axle and turns without the string slipping. What is the tension in the string on the side of the 710-g tile?
A) 9.77 N B) 5.59 N C) 3.68 N D) 6.87 N E) 4.41 N
What inductance must be put in series with a 200-? resistor at 4.00 kHz to have a total impedance of 240 ??
A) 12 mH B) 6.28 mH C) 3.28 mH D) 4.28 mH E) 5.28 mH
Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30° south of west
a. 100 units 30° south of west c. 87 units 60° south of west b. 62 units 54° south of west d. 62 units 15° south of west