Which of the following describes an action-reaction pair?
o
O
O
A. Friction slows you down, and the normal force holds you up.
B. You push a car forward, and the car pulls you forward.
O
C. Your hat pushes down on your head, and your feet push down
the ground
O
D. Earth's gravity pulls down on you, and your gravity pulls up on
Earth

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Ascientific blank must be testable and capable of being proven false?

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?