Astronomers have proposed the existence of an unexplained force that is causing the expansion of the universe to accelerate. What do they call this force?

dark matter

dark space

dark stars

dark energy

dark holes

Which statements can be inferred from the Paleozoic era time scale? There was volcanic activity during the Paleozoic era. Dinosaurs existed in the middle part of the Paleozoic era. Marine organisms existed in the early part of the Paleozoic era.

How are mixtures essential to living and non living things on earth?

A method for showing what a molecule or compound contains

Which statement is part of Bohr's atomic model? A. Electrons absorb or emit light when they change energy levels. B. Electrons with the highest energy are found with orbits of the smallest radius. C.

The Big Bang Theory is the one best supported by scientific evidence, according to top scientists. True False

What is acceleration? a. change in velocity/change in time b. change in distance/change in time c. change in mass/change in volume d. change in pressure/change in time

Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg. dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s.

The maximum restoring force that can be applied to the disk without breaking it is 40000 n. what is the maximum oscillation amplitude that won't rupture the disk

Which is a vector quantity speed or velocity

With a naked eye your are unlikely to see a "blank" in your lifetime. A - Comet. B - Shooting Star. C - Meteor. D - Planet.