The orbital path of a satellite has two focal points. When both focal points are together
A) the satellite path is an ellipse.
B) the satellite path is a circle.
C) satellites lose speed.
Answer: B
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Similar to our Sun, pulsars' rotations are believed to slow down because
a. they are losing angular momentum into space via outward streaming particles. b. they are dragging companion stars around in their magnetic field. c. they are getting tired. d. of conservation of angular momentum. e. their mass is increasing.
What did radar astronomers find in the polar regions of Mercury?
A) rift valleys B) large mare basins, such as near our Moon's south pole C) water ice that never melts in the deep craters D) polar caps of dry ice that vary seasonally, much like Mars E) auroral displays much like Earth's
Recent measurements of the temperature fluctuations in the cosmic microwave background radiation support the prediction of inflation that the overall geometry of the universe is flat
Indicate whether the statement is true or false
A 5.0-nC point charge is embedded at the center of a nonconducting sphere (radius = 2.0 cm) which has a charge of ?8.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point that is 1.0 cm from the center of the sphere?
a. 1.8 × 10^5 N/C b. 9.0 × 10^4 N/C c. 3.6 × 10^5 N/C d. 2.7 × 10^5 N/C e. 7.2 × 10^5 N/C