A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute
What minimum power must be supplied to this machine?
A) 6.7 kW B) 4.3 kW C) 3.9 kW D) 1.1 kW E) 520 W
B
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A salesman attempts to convince you to purchase a "solar neutrino shield" to protect you and your family. (It's even "on sale!") Why do you turn down this excellent offer?
A) Neutrinos rarely, if ever, interact with other matter. B) There's no such thing as a solar neutrino. C) Solar neutrinos are generated by solar winds, but we're in a solar minimum now, so the risk of damage is very low. D) The Earth's natural magnetic field already offers excellent protection against the onslaught of solar neutrinos.
Kepler's third law, p2 = a3, means that
A) a planet's period does not depend on the eccentricity of its orbit. B) all orbits with the same semimajor axis have the same period. C) the period of a planet does not depend on its mass. D) planets that are farther from the Sun move at slower average speeds than nearer planets. E) All of the above are correct.
According to Kepler’s First Law, all planets have orbits about the Sun that are
A. circles B. squares C. parabolas D. ellipses
An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/
A) A) 16 mT B) 4.9 mT C) 15 mT D) 6.0 mT E) 9.0 mT