Roller coaster has a mass of 425 kg. it sits at the top of a hill with height of 66 m. how fast is it going when it reaches the bottom?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Atelevision set that has been running for a while heats up even the air around it. which two laws of thermodynamics could be used to analyze this scenario