A combination of two or more substances in which they no longer retain their chemical properties is called a(n)
A) mixture.
B) compound.
C) heterogeneous mixture.
D) periodic trend.
E) suspension.
Answer: B
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The equivalence principle says that a person in an elevator that is in freefall feels the same acceleration as
A) a person in an elevator going up with an acceleration of g. B) a person in space, far from any gravitational source accelerating at g. C) a person in an elevator going down with an acceleration of g. D) a person in space, far away from any gravitational source with no acceleration. E) a person in orbit of Earth accelerating at g upward.
Explain what keeps the nuclear reactions in a star under control; i.e., what would happen if too large an amount of energy is released in the center?
What will be an ideal response?
A proton (+1.6 × 10^?19 C) moves 20 cm on a path in the direction of a uniform electric field of strength 2.4 N/C. How much work is done on the proton by the electrical field?
a. 7.7E–20 J b. ?7.7E–20 J c. 1.8E–19 J d. ?8.6E–20 J e. zero
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the
A) regular ball. B) lead-filled ball. C) same for both