Can someone rephrase ! a commonly used sensor is the electromechanical "gas dampened ball and tube" design. the sensor is nothing more than a small tube with a switch at one end and a gold plated steel ball at the other, held in place by a small magnet. when the sensor receives a hard enough jolt to knock the ball loose from the magnet, the ball rolls down the tube, hits the switch and closes the circuit. the tube is slanted upward so the ball should return to its original position after an impact.

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Lots of elementary school kids play sports after school. they play soccer, tennis, football, baseball, and even lacrosse. but i think that another great way to spend the afternoon is by playing a non-physical activity: chess. at our school we have a chess club that meets every week to play games and to learn about chess-related issues. chess is a wonderful game for many reasons. chess teaches students to be patient and not rush decisions. chess also teaches students how to strategize their future plans. and finally, chess teaches students the importance and necessity of sacrifice. chess can teach students just as much as any other sport. which sentence could best be added to this paragraph as a supporting detail? a) chess is not as fun as playing a sport outdoors might be. b) my father is very good at chess and plays a game with me every night. c) chess teaches students to think ahead about the consequences of their actions. d) other activities that are as fun as chess are painting, drawing, dancing, and acting.

What do the sketches of 9/11 victims in "portraits of grief" achieve?