What is the name of the line drawn perpendicular to the surface where a light ray strikes?

a. incoming ray

c. normal

b. reflected ray

d. vertical

How does density affect refraction? Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond.

The valence of an element or radical is A. not related to the number of positive or negative charges on the ion. B. greater than the number of positive or negative charges on the ion. C. equal to the number of positive or negative charges on the ion.

A ball rolling down an incline has its maximum kinetic energy at

Starting from the front door of your ranch house, you walk 50.0m due east to your windmill, and then you turn around and slowly walk 30.0m west to a bench where you sit and watch the sunrise. It takes you 27.

Two long, straight parallel wires 8.2 cm apart carry currents of equal magnitude I. The parallel wires repel each other with a force per unit length of 3.2 nN/m. The permeability of free space is 4 π * 10-7 T · m/A. Find I. Answer in units of mA.

Sally travels by car from one city to another. She drives for 30.0 min at 80.0 km/hr, 12.0 min at 105.0 km/hr, and 45.0 min at 40.0 km/hr, and she spends 15.0 min eating lunch and buying gas. A. Determine the average speed for the trip. B.

Does parallax affect the precision of a measurement that you make

If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new kinetic energy is:

A force of attraction/repulsion due to the spin of electrons

What did the protoplanets become? a. nebulae b. planets c. solar nebulae d. planetesimals