A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is
a. 0
b. 2 m/s2.
c. 4 m/s2.
d. 5 m/s2.
e. 7.5 m/s2.
d
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What is the wavelength, in meters, of radio waves produced by a radio station with a frequency of 1400 kHz? (c = 3.00 × 10^8 m/s)
The solar constant is a measure of
a. the amount of solar energy reaching Earth.
b. the length of the sunspot cycle.
c. the period of rotation of the Sun's equator.
d. the average number of sunspots seen during the Maunder minimum.
e. the Sun's mass.
Today the Sun appears to be located in the middle of the constellation Virgo. Therefore, tomorrow the Sun will be in the constellation
A) Libra. B) Virgo. C) Leo. D) Sagittarius.
A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?
A) 4.9 × 10-5 m B) 0.024 mm C) 0.59 mm D) 4.72 mm E) 1.66 mm