Two artificial satellites are in circular orbits about the Earth. Which of the two will be moving more slowly along its orbit?
A. The lower one
B. The one with the smaller mass
C. The higher one
D. The one with the larger mass
Answer: C
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A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about the force of static friction f exerted on the block?
A) f > mg B) f > mg cos ? C) f > mg sin ? D) f = mg cos ? E) f = mg sin ?
Thin Films: A 500-nm-wavelength beam of light illuminates a soap film with air on both sides and an index of refraction 1.33. If the beam of light is incident normally on the film, what is the minimum thickness of the film to make the reflected light enhanced in brightness?
A. 47.0 nm B. 74.0 nm C. 94.0 nm D. 152 nm E. 268 nm
A formal, written purpose statement summarizes your website's goals and objectives.
Answer the following statement true (T) or false (F)
A proton and antiproton each with total energy 800 GeV collide head-on. What is the total energy (particles + energy) released?
a. zero c. 400 GeV b. 800 GeV d. 1600 GeV