A force of 450 n accelerates a box across a frictionless surface at a rate of 15 m/s2. what is the mass of the box?

How do we determine the amount of dark matter in elliptical galaxies?

When the northern hemisphere is tilted toward the sun that part of the earth is closer to the sun and thus hotter? True or false

What is the 4th state of matter and it's properties?

Complete the passage. Sound waves and some earthquake waves are ___ waves. Ocean, light, and other earthquake waves are ___ waves.

State some properties of metals along with their importance

Your body is presently converting chemical potential energy from food into thermal energy at a rate of about 100 J/s, or 100 W. If heat were flowing out of you at a rate of about 200 W, would your body temperature go up or down?

Which energy depends the arbitrarily assigned zero level

What is a transverse wave

Object moving at a constant velocity will always have a

Who would most likely agree that a child learns certain behaviors from observing other people?