Melting, boiling, anf bending are physical changes but why is burning a chemical change

Onomic models a. are constructed to mirror reality as closely as possible, and in this respect economic models are no different from other scientific models. b.

A solid with flat sides that meet at sharp edges and corners is called

When warm air collides with cold air and droplets are formed it is called?

You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7 j of work in the process, how far have you moved the book?

It is safe to handle food that requires no additional preparation before service with:

A 29 foot ladder leans against a building so that the angle between the ground and the ladder is 75 ∘. How high does the ladder reach up the side of the building? Round to 2 decimal places.

What is a difference between an isotope and a ion

2. An airplane travels 335 miles in 45 minutes. How fast does it travel? How fast is that in km/hr?

A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute system and the drag force exerted on the system are equal in magnitude.

Consider the expression below. Assume m is an integer. 6m (2m + 18) Enter an expression in the box that uses the variable m and makes the equation true. (Simplify your answer completely. If no expression exists, enter DNE.)