Why does a helium balloon rise in the air while an ordinary balloon filled with air does not?

Do different people have different amounts of electrons and protons?

A prism breaking a bean of white light into its component colors is called A) scattering B) diffusion C) dispersion D) polarization

You are going sledding with your little cousins during a well-earned break. You push your 23 kg cousin so that they have a speed of 6 m/s at the top of the hill that is 17 m tall.

What is the antimatter equivalent of the electron? a. neutrino b. positron c. lepton d. fermion

What happens to gravity when someone jumps up?

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. If the force you apply has a magnitude of 86 N, what is the cart's acceleration? Assume negligible friction.

Does water expand more as the temperature drops even more below 0 deg? I am worried about the coolant in my rad. as the temp. is 40deg below.

A 1.00-kilogram ball is dropped from the top of a building. just before striking the ground, the ball's speed is 12.0 meters per second.

Why oil does not dissolve in water?

Which element has the highest number of protons? a. Calcium b. Argon c. Xenon d. Radon