Energy delivered to the ear. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. (See Figure 12.29 .) Typically, the diameter of this membrane is about 8.4 mm in humans. (a) How much energy is delivered to the eardrum each second when someone whispers (20 dB) a secret in your ear? (b) To comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.
Energy delivered to the ear. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. (See Figure 12.29 .) Typically, the diameter of this membrane is about 8.4 mm in humans. (a) How much energy is delivered to the eardrum each second when someone whispers (20 dB) a secret in your ear? (b) To comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.
Energy delivered to the ear. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. (See Figure 12.29.) Typically, the diameter of this membrane is about 8.4 mm in humans. (a) How much energy is delivered to the eardrum each second when someone whispers (20 dB) a secret in your ear? (b) To comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.
As you zip through space in your PPS (personal propulsion suit), your pulse rate as you count it is 121 bpm (beats per minute). This high pulse rate serves as objective evidence of your excitement. However, an observer on the Moon, an expert in pulse rate telemetry, measures your pulse rate as slower. In fact, she detects only 0.561 times the rate you count and claims that you must be pretty calm in spite of everything that is going on. How fast are you moving with respect to the Moon?
As you zip through space in your PPS (personal propulsion suit), your pulse rate as you count it is 119 bpm (beats per minute).
This high pulse rate serves as objective evidence of your excitement. However, an observer on the Moon, an expert in pulse rate
telemetry, measures your pulse rate as slower. In fact, she detects only 0.591 times the rate you count and claims that you must be
pretty calm in spite of everything that is going on. How fast are you moving with respect to the Moon?
speed relative to the Moon:
m/s
As you zip through space in your PPS (personal propulsion suit), your pulse rate as you count it is 117 bpm (beats per minute).
This high pulse rate serves as objective evidence of your excitement. However, an observer on the Moon, an expert in pulse rate
telemetry, measures your pulse rate as slower. In fact, she detects only 0.525 times the rate you count and claims that you must
be pretty calm in spite of everything that is going on. How fast are you moving with respect to the Moon?
m/s
speed relative to the Moon:
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