How many eclipses normally occur each year?
a. 2
b. 5
c. 7
d. 4

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.