A 500-kg elevator is pulled upward with a constant force of 5500 N for a distance of 50.0 m. (a) What is the work done by the 5500-N force? (b) What is the work done by gravity? (c) What is the net work done on the elevator?
What will be an ideal response?
(a) 275 Kj (b) -245 kJ (c) 30.0 kJ
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Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor consists of plates that are 1.0 mm apart and have an area of 1.5 × 10-4 m2. The capacitor is connected to a 12-V potential source (battery). (?0 = 8.85 × 10-12 C2/N ? m2)(a) What is the capacitance of this capacitor?(b) How much charge is on each of its plates?(c) What is the strength of the electric field between the plates?
What will be an ideal response?
Centaurus A is a radio galaxy that has a visible galaxy at the center. This central elliptical galaxy of Centaurus A is encircled by a ring of gas and dust, different from most elliptical galaxies. The dust ring orbits about an axis that is perpendicular to the axis of rotation of the elliptical galaxy. What does this suggest about this central elliptical galaxy of Centaurus A?
a. The radio jets have caused the dust disk to be driven around the elliptical galaxy. b. There are at least two black holes at the center of the elliptical galaxy. c. Centaurus A is probably the result of a merger of an elliptical galaxy and a spiral galaxy. d. Dust is produced as the jets interact with the intergalactic medium. e. Elliptical galaxies often contain dust that forms a disk along their rotation axis.
Only during the last decade of the twentieth century did the Arctic began to experience an ozone hole and formation of polar stratospheric clouds, and the hole expanded in a regular way after it appeared
What does this indicate about Arctic stratospheric temperatures during this period? Explain.
Evaporation from the oceans produces clouds that precipitate fresh water rather than saltwater because
A) salt is too heavy to evaporate. B) evaporation produces nearly pure water vapor. C) dissolved salt prevents evaporation. D) saltwater precipitates over oceans only.