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

Physics & Space Science

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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

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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:

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