Spherical Mirrors: Reza's face is 20 cm in front of a concave shaving mirror having a focal length of magnitude 30 cm. How large is the image of his face?
A. half as large as his face
B. of the same size as his face
C. twice as large as his face
D. three times as large as his face
E. four times as large as his face
Answer: D
You might also like to view...
A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W b. 11 W c. 5.4 W d. 2.2 W e. 1.1 W
When a car is struck by lightning, the resulting electric field inside the car is
A) normally huge, but for a brief time. B) small enough to be safe for a passenger inside. C) zero.
Explain the difference between force and torque
The moon's velocity is directed
A) zero. B) backward, opposite to its direction of motion. C) forward, along its direction of motion. D) inward, toward the center of Earth. E) outward, away from Earth.