Stars form from a collapsing cloud that fragments into smaller and smaller pieces. This process takes about
A) 10,000 years.
B) 25,000 years.
C) 100,000 years.
D) a few million years.
E) 100 million years.
D
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An electromagnetic wave has a magnetic field of rms value 3.0 × 10-6 T. What is the intensity of the wave?
A) 0.1 × 103 W/m2 B) 3.0 × 103 W/m2 C) 1.1 × 103 W/m2 D) 2.1 × 103 W/m2 E) 1.5 × 103 W/m2
Helium fusion results in the production of
A) iron. B) nitrogen. C) carbon. D) oxygen. E) hydrogen.
An object is placed to the left of a converging lens. Determine if the following statement is true or false. The image is always smaller or the same size as the object
1.True 2.False
A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. How high above the projection point is the ball after 2.0 s?
A) 5.4 m B) 13 m C) 25 m D) 43 m E) 50 m