The gravitational constant g was first measured accurately by henry cavendish in 1798. he used an exquisitely sensitive balance to measure the force between two lead spheres whose centers were 0.29 m apart. one of the spheres had a mass of 148 kg, while the mass of the other sphere was 0.63 kg. what was the ratio of the gravitational force between these spheres to the weight of the lighter sphere?

Which two particles are found in the center of an atom

Sound is a disturbance that travels through a medium as a

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?