If you are at a train station and a train comes toward you, the train blows its whistle. as the train comes closer the whistle gets louder and as the train gets farther the whistle is quieter. What is this effect called?

A student designed an experiment to demonstrate the interaction between Earth systems. The steps of the experiment are given below. Take a pot full of dry soil. Keep the pot in direct sunlight. Do not water the soil for a week.

A computer hard disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at 610 rad/s2 for 12s, then coasts at a steady angular velocity for another 12s. A.

A source of sound is kept in a jar in a vacuum. Air is slowly introduced to the jar. what happened to the sound coming out of the jar

A train moving with an initial velocity of 20 m/s accelerated at 4 m/s^2 for 10 seconds. During this time, the train moves a distance of how many meters

What it the final temperature of these 30 degree objects when smashed together?

About how much energy is transferred between a producer and primary consumer? A. 90% of the original energy from the Sun is transferred B. 10% of the original energy from the Sun is transferred C. 10% of the plant's energy is transferred D. 0.

If you exert a force of 500 n to walk 4 m up a flight of stairs in 4 s, how much power do you use?

The concepts of a "particle" and a "wave"

If a particle undergoes shm with amplitude 0.10 m, what is the total distance it travels in one period?

If the length of one side of a square is 12.0 m, what is the perimeter of the square?