Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25.
b. 0.50.
c. 1.0.
d. 2.0.
e. 4.0.
a
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An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the observer is stationary, what is the frequency of the siren perceived by the observer?
A. 2,032 Hz B. 2,150 Hz C. 2,220 Hz D. 2,575 Hz E. 2,750 Hz
What is the characteristic that distinguishes fermions from bosons?
A) their mass B) their electric charge C) their spin D) their size E) their speed of travel
From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?
A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio D) gamma rays, X-rays, visible light, ultraviolet, infrared, radio E) radio, X-rays, visible light, ultraviolet, infrared, gamma rays
An object undergoes a displacement while being acted on by a constant force directed to the north. The work done on this object by the force is positive during the displacement
Which statement is necessarily true about the average velocity of the object during the displacement? A) The average velocity is zero. B) The average velocity is toward the south. C) The average velocity is toward the north. D) The average velocity has a component toward the north. E) The average velocity has a component toward the south.