What happens every 29.5 days?
a. The Moon's Saros cycle
b. The Moon's synodic cycle
c. The Moon's sidereal cycle
d. The Moon's ecliptic season
e. The Moon's chance for a partial eclipse
b
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What is your latitude if the north celestial pole appears on your horizon?
A) 90° N B) 90° S C) 0° D) 45° N
To be more effective, how should one shape the tip of a lightning rod?
A) sharpened to a point B) with a rounded tip (hemispherical) C) flat (cut off perpendicular to the rod axis)
A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0 cm by 1.0 cm. If the plates are separated by 1.0 mm,
and the space between them is filled with teflon, what is the capacitance of this capacitor? (The dielectric constant for teflon is 2.1, and ?0 = 8.85 × 10-12 C2/N • m2.) A) 1.9 pF B) 0.44 pF C) 2.1 pF D) 0.89 pF
Isaac Newton's contributions to physics include
a. the laws of motion. b. the law of universal gravitation. c. invention of the calculus. d. the invention of the reflecting telescope. e. all of the above.