Starting from rest, an electron accelerates through a potential difference of 67 V. What is its de Broglie wavelength? (h = 6.63 × 10^-34 J×s, me = 9.11 × 10^-31 kg, and 1 eV = 1.60 × 10^-19 J)
a. 1.1 × 10^-10 m
c. 1.9 × 10^-10 m
b. 1.5 × 10^-10 m
d. 2.3 × 10^-10 m
B
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Which situation has the least magnitude of angular momentum about the origin?
A. A 2 kg mass travels along the line y = 3 m with speed 1.5 m/s. B. A 1 kg mass travels in a circle of r = 4.5 m about the origin with speed 2 m/s. C. A disk with I = 3 kg·m2 rotates about its center (on origin) with ? = 3 rad/s.
1.A 2.B 3.C 4.Both A and B 5.Both A and C 6.Both B and C 7.All have the same magnitude angular momentumTwo masses are being pulled up a frictionless 30.0 degrees incline by a force F parallel to the incline. The acceleration up the incline is 1.00 
The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The force F is
A. 875 N. B. 980 N. C. 1,140 N. D. 1,720 N. E. 2,070 N.
The purity of an alloy is given by the _____________.
Fill in the blank(s) with the appropriate word(s).
The king's chamber of the great pyramid in Egypt is 10.43 m long, 5.21 m wide, and 5.82 m high. What is the volume of the chamber in cubic feet, expressed to the correct number of significant figures? (1.00 in. = 2.54 cm)
A) 316 ft3 B) 3,720 ft3 C) 6,530 ft3 D) 11,200 ft3 E) 13,200 ft3