From what height should a circular hoop of radius R be released on the same slope in order to equal the sphere's speed at the bottom

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Write down two additional questions about earth's magnetic field that will make your presentation more informative.