Emission nebulae are also called _____
A) dark nebulae
B) H II regions
C) reflection nebulae
D) N II regions
B
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The Roche limit is the
a. distance from the sun within which a planet can not retain an atmosphere. b. minimum mass of an object in the solar system that would be classified as a planet. c. maximum separation distance between the sun and a given planet. d. distance from Earth at which we loose radio communication with a satellite. e. distance from a planet within which a planet can not hold itself together.
The chromosphere is red because it is hot enough to ________ hydrogen atoms
Fill in the blank(s) with correct word
The force exerted on an electron moving in a magnetic field is maximum when the electron moves
A) parallel to the magnetic field. B) perpendicular to the magnetic field. C) either of these D) neither of these
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). Water exerts a force of 200 N on the skis
The coefficient of kinetic friction between skis and water is 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed? A) 150 m/s B) 240 m/s C) 24 m/s D) 90 m/s