How is life on earth affected by earth's revolution around the sun

An engineering team designs a new rocket that is faster and lighter than any other model being produced. however, the materials end up being so expensive that no company can afford to buy them. which step of the engineering process should have addressed this problem? a. know the background. b. evaluate the results. c. identify a need. d. do the work.

V1t2 = v2t1 is an expression of who’s law

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife