How many helium balloons would it take to get an Apple start floating in the air

What is the english system of measurement called?

The gravitational force between two objects of masses m1 and m2 that are separated by distance r is The gravitational force between two objects of masses and that are separated by distance is A. proportional to r. B. proportional to 1/r. C.

As an electron goes from a higher energy level to a lower energy level in an atom, will energy be given off or absorbed?

What is the force between two small charged spheres that have charges 2x10 (power - 7) c and 3x10 (power - 7) c and are placed 30 cm apart in air?

Which part of a circuit creates an electric force field that makes it possible for the circuit to work? -bulb -buzzer -motor -voltage source

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.

Are cosmic rays and gamma rays invisible or do they have color?