What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light.
B) It is blocked by dust and its energy is thereby lost.
C) It is reflected by dust back to the star from whence it came.
D) It passes through the cloud unaffected.
A) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light.
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Planet Zero has a mass of 4.0 × 1023 kg and a radius of 2.0 × 106 m. A 10-kg space probe is launched vertically from the surface of Zero with an initial kinetic energy of 8.0 × 107 J. What maximum distance from the center of Zero is achieved by the probe?
A. 3.2 × 106 m B. 4.0 × 106 m C. 6.0 × 106 m D. 5.0 × 106 m E. 2.5 × 106 m
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A long wire carrying a 2.0-A current is placed along the y axis. What is the magnitude of the magnetic field at a point 0.60 m along the x-axis?
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