Two charged small spheres are a distance r apart and exert an electrostatic force f on each other. if the distance is halved to r/5 , the force exerted on each sphere will be..
a) 25f
b) 5f
c) f/5
d) f/25

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

What is the angular momentum of the bar about the axle?

Debris produced by mining is called