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 A) the Eiffel effect. B) the Doppler effect. C) the genesis effect. D) the electromagnetic spectrum.

A stone is dropped from the top of a cliff. the splash it makes when striking the water below is heard 3.5 s later. the speed of sound in air is 343 m/s.

Which explains how fossils for used as evidence about the theory of continental drift

Explain why atomic radius decreases as you move to the right across a period for main-group elements but not for transition elements. Match the words in the left column to the appropriate blanks in the sentences on the right.

Air flows into a jet engine at 70 lbm/s, and fuel also enters the engine at a steady rate. The exhaust gases, having a density of 0.1 lbm/ft3, exit through a circular cross section with a radius of 1 ft at 1450 ft/s relative to the engine.

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

What is the name of the effect that causes water to travel at an angle to trade winds?

Two books with different masses fall off the same bookshelf. As they fall, which has more kinetic energy and why

Which of the following is an example of convection? a a hot object transferring heat to a cooler one b the rays of the Sun warming the earth c a hot oven warming the air around it d hot air rising and cooler air falling

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?

How to measure voltage across an ungrounded component with a two channel oscilloscope?