How much voltage must be used to accelerate a proton (radius 1. 2 ×10−15m) so that it has sufficient energy to just penetrate a silicon nucleus? a silicon nucleus has a charge of +14e, and its radius is about 3. 6 ×10−15m. Assume the potential is that for point charges.

Which of the following is a presentation cue? a. crossing your arms b. mumbling c. repeating words d. whistling

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.