When the position of a simple harmonic oscillator is equal to A/2, where A is the amplitude, the kinetic energy is:
A. (3/4)
B. (1/4)
C. (3/8)
D. (1/8)
E. (1/2)
C. (3/8)
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A horizontal wire of length 3.6 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10^-4 T. What is the direction of the force on the wire?
a. 40° S of E c. toward the Earth's surface b. out of the Earth's surface d. due east
What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +0.20 diopters B) +2.5 diopters C) +2.7 diopters D) +20 diopters E) -2.5 diopters
The region of a shadow that is totally shaded is known as the _____
A) umbra B) waxing crescent C) penumbra D) waxing gibbous
The geological history of Mars is divided into different
A) eons B) eras C) periods D) epochs