Two small masses that are 10.0 cm apart attract each other with a force of 10.0 n. when they are 5.0 cm apart, these masses will attract each other with what force?
(g = 6.673 ´ 10 to the -11 power n times m squared/kg squared
a.
5.0 n
c.
20.0 n
b.
2.5 n
d.
40.0 n

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Ascientific blank must be testable and capable of being proven false?