What holds planets, stars, gas, and dust together in a galaxy?

A 10-kg mass is suspended by a rope. What is the acceleration if the tension in the rope is 118 N while the mass is in motion?

The type of energy possessed by a fluid above its base level is

When groups of atoms align their magnetic poles

If a sugar has 11 oxygen atoms, how many hydrogen atoms does it contain?

An electron moves with a speed of 8.0 * 10^{6} m/s along the + x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the + x-axis and lying in the xy-plane.

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)

Your boss at the Cut-Rate Cuckoo Clock Company wants to save money on materials. You are asked to reduce the balance wheel, which is cylindrical, dimensions to one-third their original values.