When an object is moving in simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero?
a. the magnitude of the velocity
b. the magnitude of the acceleration
c. the kinetic energy
d. the total mechanical energy
b
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What is a useful result of the discovery that Charon occasionally eclipses Pluto?
A. It showed that eclipses occur in other parts of the Solar System. B. It allowed astronomers to image surface features of Pluto. C. It allowed astronomers to measure the distance between Pluto and Charon. D. It allowed astronomers to determine the size of Pluto and Charon more accurately.
Which of the following is true of asteroids?
A) They are small rocky worlds. B) They are small icy bodies. C) Most of them are the size of Earth. D) Most of them orbit between the orbits of Mercury and Venus.
Most of the mass of the Galaxy lies in the ________
Fill in the blank(s) with correct word
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
A) 2.0 × 10-5 T B) 3.0 × 10-5 T C) 1.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T