A negatively charged balloon has 4.3 µc charge. How many excess electrons are on this balloon? The elemental charge is 1.6 x 10-19 C.

Q = N * e       excess charge due to N electrons

N = Q / e = 4.3E-6 C / 1.6E-19  C = 2.69^13 electrons

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2