How is stepping off a curb similar to taking a ride aboard an orbiting space vehicle?
What will be an ideal response?
Answer: In both instances you experience weightlessness. The main difference is the time involved. Stepping off a curb involves apparent weightlessness for a very brief time. Orbiting in a space vehicle involves not a moment in time, but all the time you are coasting in orbit.
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The work function of a certain metal is 1.90 eV. What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 231 nm B) 14.0 nm C) 62.4 nm D) 344 nm E) 654 nm
A projectile that is fired vertically at 8 km/s from Earth's surface will
A) go into circular orbit about Earth. B) rise and fall back to Earth's surface. C) follow an uncertain path. D) escape from Earth.
Quarks come in what flavors?
a. up, down and strange b. charm, top and bottom c. red, green and blue d. all of the above
The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
a. WA < WB. b. WA = WB. c. WA > WB. d. WB > WA if the volume of the ice cubes is greater than 1/9the volume of the water. e. WB > WA if the volume of the ice cubes is greater than 9 times the volume of the water.