A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A) 22 m/s.
B) 31 m/s.
C) 44 m/s.
D) 67 m/s.
B
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A beam of light that is parallel to the principal axis is incident on a convex mirror. What happens to the reflected beam of light?
A) It also is parallel to the principal axis. B) It is perpendicular to the principal axis. C) It appears to be coming from the focal point on the other side of the mirror. D) It appears to be coming from the center of curvature of the mirror. E) It appears to be coming from a point between the focal point and the center of curvature of the mirror.
The kinetic energy of an object:
a. is inversely proportional to its speed. b. is directly proportional to its speed. c. sometimes increases with increasing speed and sometimes decreases. d. is directly proportional to the square of its speed. e. is inversely proportional to the square of its speed.
The temperature of the photosphere is about
A) 3,200 K. B) 5,800 K. C) 11,000 K. D) one million K. E) ten million K.
If the average translational kinetic energy of the molecules of one sample of gas has twice the value of that of another sample of gas, how do the internal energies of the two gases compare?
1.The internal energy of the first gas is greater. 2.The internal energy of the second gas is greater. 3.The internal energies of both gases are the same. 4.We cannot determine which gas has the greater internal energy.