The thermal neutron cross section of a proton is 0.33 bn. If this cross-section were to represent the circular cross-sectional area of the proton presented to the neutron beam, what would be the radius of the proton?
A)
1.2 x 10-15 m
B)
1.6 x 10-15 m
C)
3.2 x 10-15 m
D)
4.1 x 10-15 m
E)
5.2 x 10-15 m
C
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The first scientist to be credited for postulating that Earth circled the Sun was
A) Aristotle. B) Copernicus. C) Galileo. D) Newton.
The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, and Neptune. C) Pluto and Eris. D) Mars, Jupiter, Saturn, Uranus, and Neptune.
Simple Pendulum: Suppose you want to set up a simple pendulum with a period of 2.50 s. How long should it be(a) on Earth, at a location where g = 9.80 m/s2?(b) on a planet where g is 5.00 times what it is on Earth?
What will be an ideal response?
A potential difference of 12.4 V is placed across a 4.1
resistor. What is the current in the resistor?
A. 51 A B. 3.0 A C. 0.33 A D. 16A E. 8.3 A