Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. If the velocity of the incompressible fluid is 3.2 m/s in the wide section, then what is the velocity of the fluid in the narrow section?
A. 6.4 m/s
B. 5.9 m/s
C. 5.0 m/s
D. 4.7 m/s
E. 4.2 m/s
A. 6.4 m/s
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A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 6.0 × 1024 kg B) 5.5 × 1024 kg C) 5.0 × 1024 kg D) 6.5 × 1024 kg
What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the sun?
a. Magnetic and electric fields heat the planet.
b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source.
c. The planets are still radiating heat from when they first formed.
d. Friction between the planet and its moons heat the planet.
A magnetic field exists in a current-carrying coil of wire
A) if it contains a piece of iron. B) with or without a contained piece of iron. C) only if the current changes.
General Questions: In order to get an object moving, you must push harder on it than it pushes back on you.
A. True B. False