Why are elements considered the simplest substances on earth

A book resting on a table experiences an upward normal force from the table that is equal in size, but opposite in direction, to the weight of the book. Is this an example of Newton's Third Law (force pairs) ? If so, explain why.

A street lamp weighs 200 newtons and is supported equally by two wires that form an angle of 120° with each other. What is the tensional force in each of these wires?

Where is almost all the mass of an atom?

When a fan is turned on it changes electrical energy into what?

Which is a result of using a machine? The amount of work that is done is increased. The work input is less than the work output. Both the force and the distance through which it acts increase.

Compare how your weight, mass, and the normal force exerted by the floor change when you are in an elevator that starts from rest and accelerates upward.

When experiencing loss in your life, you are likely to experience grief, but not stress True or False

What is the specific heat of wood?

A certain wave motion has a frequency of 10 cycles / s and a wavelength of 3 m. so its propagation speed is

The planet earth orbits around the sun and also spins around its own axis. 33% part (a) calculate the angular momentum of the earth in its orbit around the sun in kg • m2/s