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What dose disappeared mean? How does the tapered rim of the wheel on a railroad train allow one part of the rim to have a greater tangential speed than another part when it is rolling on a track? Why do ions stick together in chemical compounds? Why do we observe fountains of water coming out of the leaking joints or holes in pipes supplying water? What force keeps the nails and paper clips attached together? Quantity with square unit? What is the weight of one one quarter inch thick twenty inch by 20 inch sheet of aluminum? What is bomb caloriemeter? The glow emitted by a substance exposed to external radiation is? If a beam of light hits a plane mirror at a thirty degree angle at what would it be reflected? What is electricity count noun or mass noun? When a subatomic particla is released it has kinetic energy what was the original form of this energy a Gravitational b Light c Nuclear d Sound? How thick of titanium sheeting is needed to stop a high caliber bullet without it going through it? If you have a two-story house with one unit can you just turn the 1st thermostat on the bottom floor since hot air rises? What is 134lb in kilos? What is energy stored in an object? How many pulleys does a lift have? How do you know there is air resistance? What are the differences between gas and plasma, and how do their properties and behaviors vary in different conditions? What happens if an electric current were passed through the piezoelectric describe an application for this phenomenon?