How many protons are in the radioactive isotope 40/19K?

List five uses of electromagnets identified in the article.

Simpson drives his car with an average velocity of 56.0 km/h to the east. How long will it take him to drive 144 km on a straight highway?

By simultaneously conserving energy and momentum, calculate the energy of the neutron emitted in the forward direction by a beam of 150 keV deuterons undergoing the D-T reaction in a tritium target.

Which of the following is the correct definition of radiation? A. the electromagnetic radiation from the surface of an object which is due to the object's temperature B. the transmission of heat across matter C.

What two simple machines make a skateboard?

How many neutrons does element x have if it's atomic number is 35 and it's mass number 71

The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

Which answer choice best explains why nuclear reactions release more energy than chemical reactions? Electrostatic forces of repulsion are thousands of times stronger than gravitational forces.

A train's mass is 18181.81 kg. What is its weight?

a 3.0m long frictionless pendulum swings with a maximum angluar displacement of 10 degree from the vertical. at its lowest position the kinetic energy of the pendulum is 20.0j what is the potential energy of the pendulum when the kientic energy is 5.