Two swimmers compete in a race. under what condition do the swimmers have the same power?

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Will mark brainliest! asap! ! 16) which of the clouds shown would indicate a possible future rain storm? a) b) c) d)