Plane polarized light is sent through two consecutive polarizers, the first having its plane of polarization in the same direction as the incident light and the second having its plane at 90° to the original plane of polarization. A third polarizer, with plane of polarization at 60° to the original plane of polarization, is placed between the two other polarizers. What fraction of the original
intensity now gets through?
a. 0.56
c. 0
b. 0.19
d. 0.25
B
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Mass and Weight: An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?
What will be an ideal response?
A heavy ball hangs by a string, with a second string attached to its bottom (Figure 4.8 in your book). A quick pull on the bottom string breaks the
A) top string. B) bottom string. C) top or bottom string equally.
What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T ? m/
A) A) 7.3 × 10-5 J/m3 B) 3.7 × 10-5 J/m3 C) 3.6 × 10-4 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.
A block is supported on a compressed spring, which projects the block straight up in the air at velocity 
. The spring and ledge it sits on then retract. You can win a prize by hitting the block with a ball. When should you throw the ball and in what direction to be sure the ball hits the block? (Assume the ball can reach the block before the block reaches the ground and that the ball is thrown from a height equal to the release position of the block.)
A. At the instant when the block leaves the spring, directed at the block B. At the instant when the block leaves the spring, directed at the spring C. At the instant when the block is at the highest point, directed at the block D. At the instant when the block is at the highest point, directed at the spring E. When the block is back at the spring's original position, directed at that position