Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures?
a. 6/7
b. 1
c. 2
d. 13
e. 8/7
c
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Northern hemisphere winters are colder than northern hemisphere summers because
a. Earth is closer to the Sun during the summer than it is during the winter. b. the snow that falls in the northern latitudes cools Earth during the winter. c. the light from the Sun shines more directly on the northern hemisphere during the summer. d. the period of sunlight is longer during the summer than during the winter. e. the light from the Sun shines more directly on the northern hemisphere during the summer and the period of sunlight is longer during the summer than during the winter.
A quantity that is measured in ohms is
a. voltage b. current c. resistance d. electric field e. critical temperature
A spring-powered dart gun is un-stretched and has a spring constant 10.0 N/m. The spring is compressed by 8.00 cm and a 5.00 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.020 J. B. 0.032 J. C. 0.060 J. D. 0.100 J. E. 0.120 J.
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