Francium decays with a half-life of 22 minutes. If we start out with 639 mg of francium, how much would remain after 2.7 hours?

*Show all of your work

Mr. Franklin uses a machine that has an efficiency of 80%. The machine applies a force of 800 N through a distance of 20 m. Mr. Franklin applies a force of 50 N on the machine. Through what distance does Mr. Franklin apply the force? a. 4 m b.

Calculate the Potential Energy of an object that has a mass of 14-kg and is located at a height of 24-m?

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 510 m away measures the angle of elevation to the spot of light to be 45°.

Jan is holding an ice cube. What causes the ice to melt?

As elevation increases temperature decreases. At which elevation will sound travel fastest

What are the different types of limiting factors found in nature?

A solid form from liquid reactants during a chemical reaction

If an object-spring system is hung vertically and set into oscillation, why does the motion eventually stop?

What is the unit measurement for pain relief tablets and is it SI units Or English system?

Which best describes convection? It relies on the collision of particles within or between substances. It occurs in solids, liquids, or gases that are heated. It results when portions of a liquid cool and rise.