Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m
B. 1.5 m
C. 0.10 m
D. 9.8 m
E. 2.4 m
Answer: A
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Fill in the blank(s) with correct word
Photoelectric Effect: When it is struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 2.58 eV. What is the work function of this material? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 16.0 × 10-19 J)
A. 2.60 eV B. 2.18 eV C. 3.02 eV D. 3.43 eV
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Observing star clusters will give astronomers needed data for stellar evolution because all the stars in the cluster have the same ____
a. masses b. temperatures c. ages d. luminosities e. apparent magnitudes