What sorts of materials serve as moderators in nuclear reactors?
a. water b. boron
c. graphite d. concrete
a, c
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Between us and the Galactic Center lie about 100 billion solar masses
Indicate whether the statement is true or false
The temperature scale that places zero at the point where all atomic and molecular motion ceases is:
A) Fahrenheit. B) Celsius. C) Kelvin. D) centigrade. E) Ransom.
A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s b. 0.75 km/s c. 0.81 km/s d. 0.87 km/s e. 0.41 km/s
Single-Slit Diffraction: A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A. 3.9 cm B. 4.2 cm C. 6.3 cm D. 2.1 cm E. 8.5 cm