Sharpening a pencil leaves behind pencil shavings. is sharpening a pencil a physical change or a chemical change

Identify the electromagnetic waves with the longest wave lenths and the electromagnetic wave with the shortest wave lenghts

What acceleration is produced when a 12-N force is exerted on a 3-kg object?

What does critical mean?

A 75-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20.

The symbols for elements have either

Which universal force acts on protons and neutrons in an atom's nucleus?

How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?

What is a nuclear bulge? a) The bulging corner of a spiral galaxy consisting of gas in the shape of a spiral sphere that circles a galaxy b) The bulging center of a spiral galaxy consisting of debris in the shape of a flattened sphere that circles a

Your friend of mass 50 kg can just barely float in fresh water. Calculate her approximate volume.

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 61° angle to the normal. what is the angle of refraction?