After completing 10 years of experimentation, a scientist reports a new scientific law about the movement of sand on beaches. How do you know that this information cannot be valid?

Which of the following devices is used in this experiment to separate the different wavelengths emitted by the light source? A. Prism B. A transmission grating C. A reflection grating D. All of the above

A body travels 80 meters in 8 seconds at a steady speed calculate it's average speed

What is an equipotential line?

Which properties are different ways to describe the information plotted on the x-axis? Group of answer choices A luminosity and absolute magnitude B spectral class and absolute magnitude C temperature and spectral class D temperature and luminosity

Heat is a measure of the average kinetic energy of all the particles in an object

A fountain of water and steam that erupts from the ground

A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. how much work is done (in ft-lb) in pulling half the rope to the top of the building?

Does adding a neutron to an atom's nucleus makes it an ion?

What is the difference between a fault-block and upwarped mountains?

Which of the following is not one of the reasons to properly warm up before exercising? A. Develop overall flexibility. B. Increase blood flow to the muscles and raise body temperature. C. Prevent injuries such as strains sprains and muscle cramps.