A simple model of the hydrogen atom suggests that the electron orbits the proton. What is the

force that keeps the electron in orbit?

A. Electrostatic

B. Gravitational

C. Strong nuclear

D. Centripetal

One skier covered the distance of 20 km 20 minutes faster than the other skier. find the speed of both skiers if one of them is travelling 2 km/hour faster than the other one.

A uniform cylinder of radius R and mass M is mounted so as to rotate freely about a horizontal axis that is parallel to, and a distance h from the central longitudinal axis of the cylinder.

Do all solids have any similar properties

Classify each action as a cause or an effect of climate change fossil fuels burn glaciers melt Climate change rain falls in unusual amounts cities become more industrialized human population grows worldwide

When balancing an equation, you can a. alter subscripts b. change the identities of the products c. change the identities of the reactants d. write in coefficients

What is the speed of sound in a vacuum?

An object has 60 j of potential energy and 40 j of kinetic energy. then 10 j of the potential energy is converted into kinetic energy. how much work was done on the object?

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?

A rocket moves away from the surface of the earth. As the distance r from the center of the planet increases, what happens to the force of gravity on the rocket?

Why am i not floating?