How can matter be exchanged between spheres

A 100 kg roller coaster car is located at the top of a hill where the height is 20 m. What is the velocity when it reaches the bottom of the hill?

The hummingbird shown here must beat its wings repeatedly to hover over flowers and drink nectar. What force does the beating of the hummingbird's wings overcome?

Which one statement below is true? Select one: O a. When an EM wave enters a new medium, its wavelength stays the same and its frequency changes. O b. Light travels more slowly in glass than in air. O c.

A golf ball is hit with an initial speed of 33 m/s at an angle less than 45∘ above the horizontal.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

A crude approximation for the x component of velocity in an incompressible laminar boundary layer is a linear variation from u = 0 at the surface (y = 0) to the freestream velocity, U, at the boundary-layer edge (y = δ).

Why did dad leave mom?

Sal drew the electron dot diagram of an aluminum atom as shown. How should Sal correct his diagram? He should add five more dots so that the atom obeys the octet rule. He should add ten more dots so that all thirteen electrons are shown.

What uses electricity

How do the elements in the Noble Gas family compare?