Please help!
Does the hand crank generator system have energy?

What if? physicists often measure the momentum of subatomic particles moving near the speed of light in units of mev/c, where c is the speed of light, and 1 mev = 1.6 ✕ 10−13 kg · m2/s2. based on this, what are the units of momentum for a high-speed subatomic particle in terms of fundamental si units?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

In which of the following is positive work done by a person on a suitcase