4) According to the studies cited in the articles you just read, how much greater is the current extinction rate than the average background extinction rate of the last 542 million years?
A. 0-5 times greater than the background rate
B. 5-10 times greater than the background rate
C. 50-75 times greater than the background rate
I
D. 100-1000 greater than the background rate
E. 100,0000-1,000,000 times greater than the background rate

How is acceleration calculated? a. initial velocity - final velocity / timeb. initial velocity + final velocity / timec. final velocity - initial velocity / timed. final velocity / timele select the best answer from the choices provided0oood00save and exitnextmark this and return

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.

What 2 properties are used to classify radiation