A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz
(a) What is the maximum speed of the needle?
(b) What is the maximum acceleration of the needle?
What will be an ideal response?
Answer: (a) 20.3 cm/s (b) 326 cm/s2
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At the speed of light, how long would it take to reach the nearest star, Alpha Centauri?
a. about a month b. about a year c. about 4 years d. about 1000 years e. about 1,000,000 years
A conductor differs from an insulator in that a conductor has more
A) electrons than protons. B) protons than electrons. C) energy than an insulator. D) faster moving molecules. E) none of the above
The granules in the photosphere are about as big as Texas, or around 1,000 km across
Indicate whether the statement is true or false
The complementary angle of the angle of an object above the horizon is the
a. zenith angle. b. altitude. c. latitude. d. noon angle.