How many experiments are needed to prove a theory

What is a force of attraction between an object and the earth due to gravity?

After the pendulum is dropped, determine the height at which the kinetic energy is equal to the potential energy.

Which organisms play roles similar to organisms in water ecosystem

Compared to yellow light, orange light has A. a shorter wavelength. B. a wavelength closer to that of gamma rays. C. the same frequency. D. a longer wavelength.

An ideal gas at temperature t0 is slowly compressed at constant pressure of 2 atm from a volume of 10 liters to a volume of 2 liters. then the volume of the gas is held constant while heat is added, raising the gas temperature back to t0.

For each of the following, describe the relationship as directly or inversely proportional: a) wavelength vs. frequency b) wavelength vs. energy c) frequency vs. energy ... ?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?