Which type of electromagnetic radiation is useful in communications technology

A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?

How is a well different from a spring? A. It forms above ground B. It is made by humans C. It is naturally occurring D. It is difficult to find

A force 1500 n to a 100 kg car. what is the acceleration of the car

What does the negative sign in F = - kx mean? A) The displacement is in the opposite direction. B) The spring constant is small. C) The force is opposite the displacement. D) The velocity is slowing down.

The force of gravity typically acts in a downward direction on the object on earth when an object is standing still, on the flat ground, in what direction does the support or normal force act?

Which of these statements best describes a similarity between the two galaxies? Both have elongated centers. Both have centers shaped like bars. Both change their shape from time to time. Both are held together by gravitational forces.

The part of the earth system that includes earths solid, rocky, outer layer is the

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What does offset mean

How far can a person run in 15 minutes if he or she runs at an average speed of 16 kilometers / hours?