Suppose you are standing at rest as you watch a train approach you with a whistle that has a frequency of 1600 Hz. Describe the pitch or pitches you hear as the train approaches, passes in front of you, and travels away from you. above 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you

above 1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

below 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

c)as speed changes, wavelength and frequency change.

everything changes!

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force