In a science lab, a teacher instructed students to attach a piece of very fine steel wool to a clamp stand inside a fume hood. The students then lit a burner placed under the steel wool. The metal strands began to glow bright red and flames filled the steel wool. After the burner was turned off, the metal continued to burn, leaving behind reddish-brown strands that collapsed into a powder when it was touched after cooling. Based on these observations, did the steel wool undergo a chemical change or a physical change? Explain your answer.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

How does an observation about an object differ from an inference about that object

Industrial processes often require the damping of vibrations. consider a workbench that uses four large ideal springs in place of traditional legs, with each spring supporting one corner of the workbench and exhibiting a force constant of 47500 n/m. this workbench is used when creating products that involve highly unstable chemicals. according to specifications, the acceleration of the manufacturing equipment must be held to less than 22.3 m/s2 for the manufacturing process to proceed safely. the amplitude of vibrations are expected to remain under 0.622 mm throughout. given that the workbench and maufacturing equipment combine to 6.05 kg, find the maximum acceleration expected of the equipment and workbench. (ignore the mass of the springs.)