Which of the following can be used to measure an object's speed?
A Joules incorrect answer
B Newtons incorrect answer
C Miles per hour incorrect answer
D Kilometers per second per second

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.