If an object's acceleration is positive, its speed must be increasing
a. True
b. False
Indicate whether the statement is true or false
False
RATIONALE: It could have a negative velocity that is getting less negative, which corresponds to a decreasing speed.
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Photoelectric Effect: A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
A ball thrown straight upward takes 10 seconds for its up-and-down round trip. Because of air resistance, the time taken for the ball just to go up is
A) less than 5 s. B) 5 s. C) more than 5 s.
A solution in which more of the solute could be dissolved at the same temperature is called a(n) ______________ solution
Fill in the blank(s) with correct word
The rings of Uranus and Neptune are found:
A) by the Hubble Space Telescope. B) above their equators. C) in the ecliptic plane. D) outside the Roche limit. E) All of the above.