One unusual aspect of dark energy is
A) its pushes outward on everything in the universe instead of pulling inward as gravity ordinarily does.
B) it's made of a material that has not yet been observed in our laboratories.
C) Both of the above.
D) it exerts no gravitational force.
E) it exerts a new kind of fundamental force, never observed before.
C
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The symbol indicating the mass number of a nucleus is A
a. True b. False Indicate whether the statement is true or false
The most important acid involved in chemical weathering is
a. carbonic acid. b. sulfuric acid. c. hydrochloric acid. d. none of these.
In problems involving a slope or inclined plane, the force due to gravity is always perpendicular to the slope or the plane
Indicate whether the statement is true or false
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. c. decreases. b. increases. d. doubles every 4.0 seconds.