When it is struck by 240-nm photons, a material having a work function of 2.60 eV emits electrons
What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 2.00 eV B) 2.58 eV C) 5.18 eV D) 4.21 eV
B
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A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^-6 (°C)-1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150° F?
a. 10 b. 2.5 c. 7.5 d. 5.0 e. 9.5
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a. has a negative curvature. b. has zero curvature. c. has a positive curvature. d. is finite. e. has a center.
A bucket of cement is raised by a rope at constant speed at a construction site. Compared with the force of gravity on the bucket, the upward force supplied by the rope is
A) greater. B) equal. C) less.