determine period and frequency of a car whose mass is 1400 kg whose shock absorbers have have a spring constant of 6.5×10^4 after hitting the bump assuming the shock absorbers are poor so the car oscillates up and down

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excesselectrons is typical. what is the magnitude of the electric forceon a protein with this charge in a 1500 n/c electric field?

Does the earth behave like a magnet how do you prove it