Two ceramic cylinders have the following properties. Cylinder A has radius R and height 2H, while Cylinder B has radius 3R and height H/4. Their resistances are measured, and it is found that 
What is the ratio of the resistivities 
of the ceramics from which they are made?
A. 1/36
B. 9/8
C. 16/9
D. 1/18
E. 36
F. 9/4
A. 1/36
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Starting from rest, an electron accelerates through a potential difference of 51.6 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. 4.4E+13 m b. 2.4E–10 m c. 1.7E–10 m d. 1.1E–24 m e. 2.6E–11 m
The surface of the sun seems to be about 10,000ºF. What would you guess the rate of heat emission from the sun to be for an area of the sun that measures 1 ft^2?
Fill in the blank(s) with the appropriate word(s).
A weight of mass m is at rest at O when suspended from a spring, as shown. When it is pulled down and released, it oscillates between positions A and B. Which statement about the system consisting of the spring and the mass is correct?
A. The gravitational potential energy of the system is greatest at A. B. The elastic potential energy of the system is greatest at O. C. The rate of change of momentum has its greatest magnitude at A and B. D. The rate of change of gravitational potential energy is smallest at O. E. The rate of change of gravitational potential energy has its greatest magnitude at A and B.
A roller coaster, loaded with passengers, has a mass of 2 000 kg; the radius of curvature of the track at the bottom point of the dip is 24 m. If the vehicle has a speed of 18 m/s at this point, what force is exerted on the vehicle by the track? (g = 9.8 m/s2)
a. 4.7E+4 N b. 2.7E+4 N c. 2.0E+4 N d. 7.4E+3 N