Why did the solar nebula flatten into a disk?
A) The force of gravity pulled the material downward into a flat disk.
B) It flattened as a natural consequence of collisions between particles in the nebula, changing random motions into more orderly ones.
C) As the nebula cooled, the gas and dust settled onto a disk.
D) The interstellar cloud from which the solar nebula formed was originally somewhat flat.
B
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Friction: Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 41 s. How far from his starting point has Jason traveled when he finally coasts to a stop?
A. 3900 m B. 2900 m C. 2000 m D. 1400 m
Heavy rains in a desert environment can result in
A) flash floods. B) cross-bedding. C) intensified dune migration. D) floodplains.
Index of Refraction: Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s)(a) What is the index of refraction of this liquid?(b) What is the frequency of the light in air?
What will be an ideal response?
A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the radius of the coils?
A. 9.2 cm B. 13 cm C. 0.56 cm D. 7.5 cm