The cataclysmic explosion of a star that throws most of its matter into space is called a(n) ______________
Fill in the blank(s) with correct word
supernova
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A sled weighs 10.0 kg It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope if it is parallel to the slope.
A. 47.9 N B. 37.4 N C. 94.1 N D. 33.5 N E. 23.8 N
Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
A) atomic number = 13; atomic mass number = 6 B) atomic number = 6; atomic mass number = 7 C) atomic number = 6; atomic mass number = 13 D) atomic number = 7; atomic mass number = 13
A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 b. 3/8 c. 7/16 d. 9/16 e. 3/4
A sound source of 100 watts radiates sound uniformly in all directions. The intensity of the sound at a distance of 4.00 m is
A. 0.301 
B. 0.353
C. 0.497
D. 0.535
E. 0.621