Any naturally occurring, inorganic, crystalline substance with a fairly definite chemical composition is called a(n)
a. element.
b. compound.
c. rock.
d. mineral.
d
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Which angle is the angle of incidence for the light ray shown approaching the plane mirror?
 a. 60° b. 30° c. neither d. eitherThe International Space Station has a mass 1.8 × 105 kg. A 70.0-kg astronaut inside the station pushes off one wall of the station so she accelerates at 1.50 m/s2
What is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall relative to an observer initially at rest relative to the space station before the push? A) 5.8 × 10-4 m/s2 B) 1.50 m/s2 C) 4.7 × 10-4 m/s2 D) zero E) 3.9 × 10-3 m/s2
The magnetic field inside a solenoid having 100 turns per cm at a current of 5.0 A is
a. 
b. 
c. 
d. 
e. 
In what way does our theory of nuclear fusion predict that the Sun should be different today than it was when fusion began about 4-1/2 billion years ago?
A) The Sun's mass should be about 30% higher today. B) The Sun's mass should be about 30% lower today. C) The Sun's luminosity should be about 30% higher today. D) The Sun's radius should be about 30% higher today. E) The Sun's distance from Earth should be about 30% lower today.