What can be used to make complicated concepts and systems easier to study and understand?

A circular ring of charge with radius b has total charge q uniformly distributed around it. What is the magnitude of the electric field at the center of the ring? a) 0 b) kₑq/b² c) kₑq²/b² d) kₑq²/b e) None of these

In each trial, the jar had a different weight. How did this affect the way that the jar floated?

Which substances are responsible for accelerating chemical reactions in cells? a) amino acids b) enzymes c) nucleic acid d) lipids

What do the distance from the crest to the equilibrium of a wave called

What is the horizontal acceleration of a ball that is launched horizontally with a velocity of 5.6 m/s? a.-9.8 m/s2 b. 0 m/s2 c. 5.6 m/s2 d. 9.8 m/s2

Imagine that you put two objects in a bucket of water. Give an example of an object that has a greater mass but will float

Imagine you fill an insulated cup almost full with chopped or crushed ice, and measure the temperature after a minute or two, once it's all come to thermal equilibrium.

A 23kg block at rest on a flat surface experiences 200 N of friction. What is the coefficient of friction for the surface

Some ideas for 7th grade science fair projects

A mover pushes a 245 kg piano so that it accelerates uniformly from rest to 1.5 m/s in 5.00 s. What is the power delivered by the mover in this time interval? A 55W B 110W C 280W D 540 W