3. Later, that same train is at rest and you are driving toward it at 50 m/s when it emits a pitch of 1500 Hz. With what frequency will you hear the pitch? Show your work.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion