50 points!
go around your house and hit (or tap) ten different objects. the objects should be different shapes and made of different material (choose things to hit that won’t each object is a different medium for sound. try to hit each using the same amount of energy.

describe each object that you hit. what is its shape and what is it made of? then describe how it sounds to you. does it transmit sound well? does it absorb sound? is the sound loud or soft? is there a “ring” to the sound? does it sound like a “thunk” or does it sound like a drum?

rank the ten objects from loudest to softest.

draw some conclusions based on your results from steps 1 and 2. for example, are there a certain shapes or materials that are better or worse media for sound travel?

Irrigation channels that require regular flow monitoring are often equipped with electromagnetic flowmeters in which the magnetic field is produced by horizontal coils embedded in the bottom of the channel. a particular coil has 100 turns and a diameter of 6.0 m. when it's time for a measurement, a 4.5 a current is turned on. the large diameter of the coil means that the field in the water flowing directly above the center of the coil is approximately equal to the field in the center of the coil. the field is directed downward and the water is flowing east. the water is flowing above the center of the coil at 1.5 m/s . what is the magnitude of the field at the center of the coil? what is the direction of the force on a positive ion in the water above the center of the coil? what is the magnitude of the force on an ion with a charge +e?