How do fish breathe

How many series connected 2v cells does a typical 24 storage battery contain

A fire engine is rapidly approaching the corner. Explain what happens to the frequency of the sound wave as the fire engine draws closer. What do you hear?

A beam of light has a wavelength of 4.5 * 10^-7 meter in a vacuum. The frequency of this light is (1) 1.5 * 10^-15 Hz (3) 1.4 * 10^2 Hz (2) 4.5 * 10^-7 Hz (4) 6.7 * 10^14 Hz

Roland writes a story in which boaters become stranded on a sandy island. In the story, they set about collecting materials to create semiconductors to repair computer components in their radio.

A parachutist with a camera, both descending at a speed of 10.8 m/s, releases that camera at an altitude of 60 m. In this problem, take "up" to be positive. What is the velocity of the camera just before it hits the ground?

Pure water has a hydrogen ion concentration of 1 x 10 (-7) M and a ph of 7. A student measures a basic solution and finds that it has a hydrogen ion (H+) concentration of 1 x 10 (-3).

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A train travels 53 kilometers in 4 hours, and then 90 kilometers in 3 hours. What is the average speed

What units should be used when measuring the mass of a lady bug?

What happens if you don't wear your school uniform?