What elements do astronomers consider heavy elements?
A) all elements besides hydrogen and helium
B) elements that are heavier than iron
C) elements that are heavier than uranium
D) elements that are heavier than hydrogen
E) elements that are heavier than carbon
A
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Inelastic Collisions: In an inelastic collision involving an isolated system, the final total momentum is
A. exactly the same as the initial momentum. B. more than the initial momentum. C. less than the initial momentum.
Two people are balanced on a seesaw. If one person leans inward toward the center of the seesaw, that person's end of the seesaw tends to
A) rise. B) fall. C) stay at the same level. D) need more information
A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket
1.at all points in its motion except at it highest point. 2.at all points in its motion. 3.at no points in its motion. 4.at none of these choices.
Two point charges each have a value of 30.0 mC and are separated by a distance of 3.00 cm. What is the electric field midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 40.5 × 10^7 N/C c. zero b. 20.3 × 10^7 N/C d. 10.1 × 10^7 N/C