An atom with fewer electrons than protons is a
a. semiconductor
b. superconductor
c. positive ion
d. negative ion
e. none of the above
C
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Kepler's ________ law states that the orbits of planets are elliptical, with the Sun at one focus.
A. First B. Second C. Third D. Fourth
Albert uses as his unit of length (for walking to visit his neighbors or plowing his fields) the albert (A), the distance Albert can throw a small rock
One albert is 92 meters How many square alberts is equal to one acre? (1 acre = 43,560 ft2 = 4050 m2)
In ultrasound the _____________ of the sound is much greater than in normal sound
a. frequency b. period c. wavelength d. amplitude e. speed
A 12.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring
Its vertical position y as a function of time t is given by y(t) = 4.50 cm cos[(19.5 s-1)t - ?/8]. (a) What is the spring constant of the spring? (b) What is the maximum acceleration of the object? (c) What is the maximum speed that the object reaches? (d) How long does it take the object to go from its highest point to its lowest point?