What is the energy level for calcium

Two parallel lines are crossed by a transversal. Parallel lines u and w are cut by transversal t. At the intersection of lines u and t, the bottom left angle is 105 degrees.

When does the chunk of ice have the most potential energy? A. right before it breaks off B. a short time after it starts to fall C. right before it lands in the ocean D. at the very moment it lands in the ocean

What can the arrow in a chemical reaction be translated to mean? Check all that apply A. yields B. accompanied by C. react to form D. added to E. except

How does a scientist critique another scientist's conclusions

Does adding a neutron to an atom's nucleus makes it an ion?

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)