In a fusion reaction,
a) light nuclei form heavier nuclei.
b) heavier nuclei disintegrate into lighter nuclei
c) the breeding of more fissionable material takes place.
d) the fuel used must be naturally radioactive.
a
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Projectile Motion: A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air resistance.(a) How high is the bridge from the water below?(b) How far horizontally does the rock travel before striking the water?
Fill in the blank(s) with the appropriate word(s).
An optical system comprises in turn, from left to right: an observer, a lens of focal length +30 cm, an erect object 20 mm high, and a convex mirror of radius 80 cm
The object is between the lens and the mirror, 20 cm from the lens and 50 cm from the mirror. The observer views the image that is formed first by reflection and then by refraction. What is the position of the final image, measured from the mirror? A) 90 cm B) 102 cm C) 114 cm D) 126 cm E) 138 cm
In general, the ________ lunar craters sit atop the mare
Fill in the blank(s) with correct word
There is no obvious evidence for large-scale structure greater than about
A) 200 kpc. B) 600 kpc. C) 200 Mpc. D) 600 Mpc. E) 2000 Mpc.