How long does it take a light signal to reach an asteroid 315 million kilometers from Earth ?​

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.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.