Why do physicists use models?

Suppose you want to separate the leaves, acorns, and twigs from a pile of soil. Filtration and distillation are two processes of seperating mixtures. Explain which process you would use and why.

A stationary boat in the ocean is experiencing waves from a storm. the waves move at 54 km/h and have a wavelength of 170 m. the boat is at the crest of a wave. part a how much time elapses until the boat is first at the trough of a wave?

When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. In one such accident, a 1750kg car traveling to the right at 1.

What three things can happen to the radiation that earth receives from the sun?

A railway wagon of mass 20t is moving along a level track at 10km/h when it collides and couples together with a second wagon of mass 25t moving in the same direction at 5km/h.

What is the simplest relationship between the angular wavenumber k and just one of the other kinematic variables? Express your answer using only one of the other kinematic variables plus constants like π.

The pilot of an airplane notes that the compass indicates heading west. The airplane's speed relative to the air is 100 km/h. The air is moving in a wind at 25.0 km/h toward the north.

How do you get a resultant factor? A. Add two or more vectors B. Add two scalars C. Multiply two scalars D. Multiply two vectors

A panpipe is made of five pipes. The longest pipe is 25 centimeters long and the shortest is 5 centimeters long. Which of these pipe produces the highest-frequency sound and why?

Model rocket A is launched at an angle of 70° above the x axis, with an initial velocity of 40 m/s. An identical rocket B is launched under the same conditions at an angle of 90° above the x axis, also with an initial velocity of 40 m/s.