Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of
What is the work function of this metal? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s,
1 eV = 1.60 × 10-19 J)
A) 3.73 eV
B) 3.13 eV
C) 4.33 eV
D) 4.92 eV
A
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The quark structure of the proton is uud
Indicate whether the statement is true or false
Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere ("aerobraking") before settling into their final orbits?
A) It saved money because the spacecraft used atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines. B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere. C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth. D) Each spacecraft also carried a lander, and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.
Water runs out of a horizontal drainpipe at the rate of 120. liters per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?
A) 12.0 N B) 19.6 N C) 15.8 N D) 8.88 N E) 6.20 N
In the context of the Jovian rings, moons:
A) spread the rings outward. B) supply the rings with particles. C) loosen, unbind, and release the rings. D) prevent the alteration of the shapes of the rings.