Why do galaxy collisions lead to star formation?
A. Interstellar clouds collide and become highly compressed.
B. Interstellar clouds are ignited by passing stars from the other galaxy.
C. Stars collide with each other, explode, and their gas creates new stars.
D. All of these choices are correct.
Answer: A
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A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N ? m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
A. 0.37 T B. 1.6 T C. 0.50 T D. 1.2 T E. 2.5 T
Observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age
a. True b. False Indicate whether the statement is true or false
Radioactive Decay: If the half-life of a material is 45 years, how much of it will be left after 100 years?
A. more than 1/2 B. less than 1/2 but more than 1/4 C. more than 1/4 but less than 1/2 D. less than 1/4 but more than 1/8 E. less than 1/8
The ratio of the radius of a classical electron (re = kee2/mec2 = 2.8 × 10^-15 m) to the radius of a 4He nucleus (r = r0A1/3) is
a. 2.0 b. 0.68 c. 1.5 d. 0.92 e. 2.4