A gold block with a mass of 18,000kg is placed 9m from a lead sphere (22,000kg). Find the force of gravity felt by the gold block.

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which of the following are appropriate acceleration units?