density = mass/volume = 100kg/10ml = 10kg/ml
voluime = mass/density = 50g/2 g/ml = 25 ml
mass = density x volume = 2x55 = 110 kg
The speed of the runner is 300 m /38 seconds. You can simplify this answer to be about 7.9 m/s
Because dark line spectra result from passing white light through ionized gasses and plasmas, which is what the atmosphere of stars are made of. These frequencies are scattered by the star's atmosphere as it leaves the surface (photosphere) of the star, and don't make it to earth.
Answer:
v=wavelength ×f
wavelength=v/f=455/655=0.694m
Is this a true or false question?
