Lisa throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building. Find the time of flight
What will be an ideal response?
3.2 s
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Which of the following is NOT true about the RGB color system?
A. The system combines the red, green, and blue light channels. B. The intensity level of each light channel is measured in values. C. The values range from 0 to 360. D. To ensure exact color specifications, use different values from the channels.
Sunlight reflected from the surface of a lake
A) is unpolarized. B) tends to be polarized with its electric field vector parallel to the surface of the lake. C) has undergone refraction by the surface of the lake. D) tends to be polarized with its electric field vector perpendicular to the surface of the lake. E) is totally polarized.
Aluminum has a magnetic susceptibility ? = 1.7 × 10-5 at T = 300 K. What will be the magnetization of a small sample of aluminum placed in a 1.5 T magnetic field at T = 150 K?
A) 20.3 A/m B) 1.5 A/m C) 81.1 A/m D) 40.6 A/m E) 10.2 A/m
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation?
A) It does not change. B) It decreases. C) It increases. D) It changes, but it is impossible to tell which way.