What is the best alternative explanation for the dark matter in the milky way based on the observed orbital motions of stars and gas?

How is the frequency of an electromagnetic wave related to energy? A) As the frequency of the wave decreases, its energy increases. B) As the frequency of the wave fluctuates, its energy decreases.

Gravitational force is affected by: a. mass c. distance b. weight d. both a and c

What form of energy does a compressed spring have? a. heat energy b. kinetic energy c. chemical energy d. potential energy

A solid sphere and a solid cylinder, both uniform and of the same mass and radius, roll without slipping at the same forward speed. it is correct to say that the total kinetic energy of the solid sphere is

When Mendeleev organized elements in his periodic table in order of increasing mass, similar elements with similar properties were in the same (Blank)

A falling back in mid air has what

What objects are often arranged by their properties

Which nuclei is not radioactive? A. Am-241 B. Mg-24 C. Pu-241 D. U-238

What is the method of charging used when you run a straw with fur

A man runs at a velocity of 6.2 m/s for 11.5 minutes. When going up and increasingly steep hill, he slows down at a constant rate of 0.25 m/s^2 and comes to a stop. How far did he run?