If Earth's axis were tilted at 30°, the daylight hours in Washington, D.C., in June would
a. remain the same.
b. be greater.
c. be less.
d. be equal to the hours of darkness.
b
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An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s
What will be an ideal response?
A 1.5-kg mass attached to an ideal massless spring with a spring constant of 20.0 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the mass is released from rest at x = 10.0 cm. (That is, the spring is stretched by 10.0 cm)
(a) Find the frequency of the oscillations. (b) Determine the maximum speed of the mass. At what point in the motion does the maximum speed occur? (c) What is the maximum acceleration of the mass? At what point in the motion does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement x as a function of time t.
A visual defect wherein a person can see distant objects clearly but not nearby objects is called
a. dispersion. b. destructive interference. c. farsightedness. d. nearsightedness.
Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N • m2/kg2)
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 1.95 km/s