It is said that electric charge is conserved, which means that electric charge
A) may occur in an infinite variety of quantities.
B) is a whole number multiple of the charge of one electron.
C) will interact with neighboring electric charges.
D) can be neither created nor destroyed.
E) is sometimes negative.
Answer: D
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Assume a diatomic molecule can be considered to be two point masses separated by a distance r. The center of mass of the system is located a distance x from m1, equal to
a. m1r/(m1 + m2) b. m2r/(m1 + m2) c. (m1 + m2) r/m1 d. (m1 + m2) r/m2 e. r(m2/m1)
A 0.28-kg stone you throw rises 34.3 m in the air. The magnitude of the impulse the stone received from your hand while being thrown is
a. 0.27 N s. b. 2.7 N s. c. 7.3 N s. d. 9.6 N s. e. 34.3 N s.
Inelastic Collisions: A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s. If the vehicles lock bumpers, how fast are they moving just after the collision?
Fill in the blank(s) with the appropriate word(s).
Main sequence stars are fusing hydrogen into helium in their cores
Indicate whether the statement is true or false