5. Two charged spheres are separated by
315 mm. What is the force between them if
the charge on one sphere is +9.6.X 10-7 C.
and the charge on the other sphere is ..
-2.2 x 10-5 C?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass