Why do objects repel and attract?

This solid layer of the earth is made of mostly iron and nickel.

At what distance along the central perpendicular axis of a uniformly charged plastic disk of radius 0.390 m is the magnitude of the electric field equal to one-half the magnitude of the field at the center of the surface of the disk?

How many grams are in 882 μg? & The density of gold is 19.3 g/cm3.? Answer the following: a. What is the volume, in cubic centimeters, of a sample of gold with mass 0.715 kg? b.

A galvanometer has full scale deflection current of 500 micro-Ampere, and resistance of 100 Ohm. Shunt with what resistance has to be combined with the galvanometer in order to transform it to an ammeter able to measure current of 10 Ampere full

A boy pulls a 30.0-kg box with a 210-N force at 39° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is is 0.23 and the box is pulled a distance of 38.

What is the unit for force we use when calculating F=ma?

A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of this sum. might be:. A. zero. B. 3. C. 12. D. 47. E. 50

Calculate the gravitational potential energy of a 10kg box on the top shelf of a closet, 2m above the floor

In late adulthood, changes in memory may bot be inevitable however, any decline in memory tends to invite

On october 15, 2001, a planet was discovered orbiting around the star hd 68988. its orbital distance was measured to be 10.5 million kilometers from the center of the star, and its orbital period was estimated at 6.3 days.