An ideal Polaroid will transmit 50% of incident sunlight. How much light will be transmitted by two ideal Polaroids oriented with their axes parallel to each other?
A) 0%
B) 50%
C) 100%
D) between 0% and 50%
E) between 50% and 100%
Answer: B
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After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in
the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east B) toward the northeast C) toward the southwest D) toward the southeast E) toward the west
Multiple-Object Accelerating Systems: As shown in the figure, a 10-kg block on a perfectly smooth horizontal table is connected by a horizontal string to a 63-kg block that is hanging over the edge of the table. What is the magnitude of the acceleration of the 10-kg block when the other block is gently released?
A. 8.5 m/s2 B. 8.1 m/s2 C. 7.5 m/s2 D. 9.0 m/s2
The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2. Assume a circular orbit
(a) What is the period of the International Space Station's orbit? (b) What is the speed of the International Space Station in its orbit?
Elementary particles that experience the weak nuclear force but not the strong nuclear force are called
A) hadrons. B) baryons. C) leptons. D) mesons. E) bosons.