State the basic law of magnetism

if the distance of separation begin two objects is doubled, is the gravitational force between the objects increased or decreased? by what factor?

If the efficiency of an electric furnace is 96%, then 96% of the input energy is transformed into thermal energy. what is the other 4% of the electricity transformed into?

How much work is done by a force of 20N while moving an object through distance 10 m of the force

Is the following sentence true or false? Two atoms of the same element can have different numbers of protons.

A train, traveling at a constant speed of 25.8 m/s, comes to an incline with a constant slope. While going up the incline, the train slows down with a constant acceleration of magnitude 1.66 m/s². What is the speed of the train after 8.

A measure of how much pulling, or tension, a material can withstand before breaking is - A. hardness. B. brittleness. C. tensile strength. D. malleability.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?

A satellite on a Low Earth Orbit is flying with a speed of 7.65 km/s. The vertical component of the Earth's magnetic field is 35.3 μT at the current location of the satellite.

A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day. How much energy does the air conditioner use during that day?