HELP WORTH 2O POINTS As kids sled down a hill: (highlight the correct answer for each) 1. As the kids go down the hill, their potential energy (increases, decreases, or stays the same).
2. As the kids go down the hill, their kinetic energy will (increases, decreases, or stays the same).
3. As the kids go down the hill, their total energy (PE + KE) will (increase, decrease, or stay the same).
4. If the mass of the sled doubles (a 2nd kid jumps on!), then PE will (increase, decrease, or stay the same).
5. If the kids go down a hill double the height, the PE will (increase, decrease, or stay the same).
6. If the hill is icy and the sled doubles the velocity (faster mom!), the KE will (increase, decrease, or stay the same).
7. If the mass of the sled is half the size (or 1 kid is on it instead of 2!), the KE will (increase, decrease, or stay the same).

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Just put the number and the answer next to it I NEED ALL 7 ANSWERED PLEASE

Which describe reflection? check all that apply. light bounces off a boundary.

19. explain why a magnet from your refrigerator could not be used to lift something as heavy as a car. (chapter 7 – pages 202-203) 20. can a magnet ever have a single pole? explain your answer. (chapter 7 – page 208) 21. what happens to the wavelength of a wave if the frequency is increased? (chapter 9 – pages 280-281) 22. an ocean wave has a wavelength of 10 m and a frequency of 4.0 hz. what is the velocity of the wave? show the appropriate equation from your book and show your work with units. (chapter 9 – page 282) 23. as you sit outside, the sound of a siren becomes lower in pitch. is the emergency vehicle moving away from or towards you? explain how you know. (chapter 10 – page 315-316) 24. why are two astronauts in space unable to hear one another? (chapter 10 – page 307) 25. explain in at least 3 sentences how electromagnetic waves form. (chapter 11 – page 338-339) 26. using the chart on page 345 in your textbook, what are the three types of electromagnetic wave with wavelengths shorter than those of visible light. give an example of each. (chapter 11 – pages 345-351) 27. explain why a leaf usually appears to be green, but a rose typically appears red. (chapter 12 – page 373) 28. what is the difference in light that is refracted compared to light that is reflected? think in terms of speed of light as well as what happens to light waves when they interact with a medium. (chapter 12 – pages 369-370) 29. how are concave and convex lenses different? (chapter 13 – page 408-410) 30. what type of mirror is used in rearview mirrors in cars? why is it important that these mirrors have the warning, “objects in mirror are closer than they appear.”? (chapter 13 – page 405)

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.