A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?

Your friend comes back to school after a week of being sick. She tells you that she wasn't quite able to talk during that time. Which organ was responsible for her inability to emit (release) sounds to talk?

Push a notebook or some other object so that it slides across a table or desktop. What force causes the notebook to start moving? What force causes the notebook to stop moving? If you don't know the name of the forces, just describe them.

When current is flowing through a car's rear defroster (Exercise 33), the voltage at each end of the metal strips is different.

A 325 N force applied to an object for 5.5 s. What's the impulse?

What are the factors that affect ocean density? Define density

Suppose you squeeze a sponge into a small ball. does the mass of the sponge change? Does it's density change?

A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating.

If a pilot pulls her 12.0 kg rollaboard suitcase along the ground with a force of 25. N for 10 M. The handle she pulls on makes an angle of 36.5 degrees with the horizontal. How much work does she do over the ten meter distance?

What happens to the density when water is poured into a empty glass?

A British newspaper was interested in whether groups of people who differed in social standing were treated differently when they complained to organizations about poor service they had received.