shionika

Students build four electromagnets and test them by picking up metal tacks. Here are their partial results. 12 coils 4 tacks 24 coils 9 tacks 36 coils 13 tacks 48 coils ? tacks Which is the best prediction for the number of nails the electromagnet with 48...

here is my options for the question 16 tacks 16 tacks 12 tacks 12 tacks 13 tacks 13 tacks 20 tacks

How do electromagnets cause a maglev train to levitate above the track? (1 point) Responses Magnets in the track and magnets in the bottom of the train repel each other. Magnets in the track and magnets in the bottom of the train repel each other. Magnets...

What happens to sound waves from an object as it moves toward you?(1 point) Responses The pitch gets lower because of an increase in wavelength. The pitch gets lower because of an increase in wavelength. The pitch gets higher because of an increase in fre...

coniciawa

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A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?(1 point) Responses amplitude speed wavelength

Which statement about the effect of temperature on the speed of sound is correct?(1 point) Responses As temperature increases, the speed of sound increases because the medium becomes denser. As temperature increases, the speed of sound increases because t...