How do I calculate the frequency of an observer

One student did an experiment with salt water. The steps of the experiment are shown below. Pour half a cup of salt water into a pan. Keep the pan outside in the sun for a day. Allow all the water in the pan to evaporate.

What are the subzones for each main zone?

What are the 3 laws of Newton

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

When you turn up the volume on a radio, which of the following change: velocity of sound, intensity, pitch, amplitude, frequency, wavelength, or loudness?

Which of the following is a vector quantity? A. 83 ounces of liquid B. 55 km/hr in a truck C. 15 seconds of travel D. 10 m/s down

Which of the following best describes the ultraviolet catastrophe of blackbody radiation? A. As energy is added to an object acting as a blackbody radiator, its emissions move to the ultraviolet part of the electromagnetic spectrum. B.

Is an engine-activated booster unit that reduces the effort required to apply the hydraulic brakes

A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg) ?

On a very hot summer day, the rooms on the first floor of a house stay cooler than the rooms on the second. Which form of thermal energy flow causes this to occur? A) Conduction B) Convection C) Kinetic D) Radiation