As water begins to boil in a kettle the hotter water at the bottom of the kettle closest to the stove begins to rise and the cooler water above sinks and warms. Why does this occur?

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

Students use a stretched elastic band to launch carts of known mass horizontally on a track. The elastic bands exert a force F, which is nonlinear as a function of the distance x that the band is stretched.

A person throws a rock 36 feet into the air straight up what was the rocks initial vertical speed

You are walking from your math class to your science class. You are pulling your rolling book bag which weighs 20 N. You walk 45 m down the hall. What is the total work performed on your books? A).44J B) 2.25J C) 65J D) 900J

Give an example of a vector quantity. Explain why this type of quantity would be used to describe this event.

In a reaction with water, a base will accept a proton from the water; therefore, the water must be acting as an acid. True or False

What are the three properties of gravity

How do matter and energy interact?

What is something that has a lot of thermal energy?

Why do we use a shunt on the galvanometer