A _____ is a meteor in space before it enters Earth's atmosphere
A) meteoroid
B) meteorite
C) comet
D) nebula
A
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If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial intensity of the beam?
a. 
b. 
c. 
d. 
e. 
What is meant by "neutrino oscillation"?
What will be an ideal response?
The dominant semiconducting material now in use is
A. silicon. B. carbon. C. germanium. D. gallium.
Constant Angular Acceleration: In the figure, point P is on the rim of a wheel of radius 2.0 m. At time t = 0, the wheel is at rest, and P is on the x-axis. The wheel undergoes a uniform counterclockwise angular acceleration of 0.010 rad/s2 about the center O.(a) At time t = 0, what is the tangential acceleration of P?(b) What is the linear speed of P when it reaches the y-axis?(c) What is the magnitude of the net linear acceleration of P when it reaches the y-axis?(d) How long after starting does it take for P to return to its original position on the x-axis?
What will be an ideal response?