Vision Problems: The power of a lens is 4.0 diopters and its diameter is 5.0 cm. What is the focal length of this lens?
A. 25 cm
B. 55 cm
C. 10 cm
D. 0.25 cm
E. 2.5 cm
Answer: A
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A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The rotational inertia of the rod about this axis is 4.0 kg/m2 . The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the
vertical position? a. 3.4 rad/s b. 4.4 rad/s c. 4.3 rad/s d. 5.8 rad/s e. 6.8 rad/s
The sky is blue because molecules scatter blue light more effectively than red light
Indicate whether the statement is true or false
A certain grapefruit on Earth has a mass of one kilogram and a weight of one newton. When the grapefruit is on the moon its mass is
A) less than one kilogram. B) ten newtons. C) less than ten newtons. D) one kilogram.
Capacitive reactance XC is given by
a. 1/?C b. ?C c. ?/C d. C/? e. 1/?2C