7. what is the kinetic energy of a 3-kilogram ball that is rolling at 2 meters per second?
8. two objects were lifted by a machine. one object had a mass of 2 kilograms, and was lifted at a speed of
2 m/sec. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec.
a. which object had more kinetic energy while it was being lifted?
b. which object had more potential energy when it was lifted to a distance of 10 meters? show your
calculation.

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

9. the history of life on earth is recorded in

Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10