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23 Nov 2019
Basic Physics -a)The scale of a spring balance reading from 0to 175N has a lengthof 14.5 cm. A fish hangingfrom the bottom of the spring oscillatesvertically at a frequencyof 3.00 Hz.
Ignoring the mass of the spring, calculate the mass of thefish.Leave your answer in Kg.
b)A bat flies toward a wall, emitting a steady sound withafrequency of 22.0 kHz. This bat hears its own sound plusthe soundreflected by the wall. How fast should the bat fly, vb, to hear abeatfrequency of 215 Hz?
Take the speed of sound to be 344 m/s.
Express your answer numerically in meters per second tothreesignificant figures.
c)What is the thinnest soap film (excluding the case ofzerothickness) that appears black when illuminated with light withawavelength of 495 nm? The index of refraction of the filmis 1.35,and there is air on both sides of the film.
Express your answer in nanometers.
Basic Physics -
a)The scale of a spring balance reading from 0to 175N has a lengthof 14.5 cm. A fish hangingfrom the bottom of the spring oscillatesvertically at a frequencyof 3.00 Hz.Ignoring the mass of the spring, calculate the mass of thefish.Leave your answer in Kg.
b)A bat flies toward a wall, emitting a steady sound withafrequency of 22.0 kHz. This bat hears its own sound plusthe soundreflected by the wall.
How fast should the bat fly, vb, to hear abeatfrequency of 215 Hz?
Take the speed of sound to be 344 m/s.
Express your answer numerically in meters per second tothreesignificant figures.
c)What is the thinnest soap film (excluding the case ofzerothickness) that appears black when illuminated with light withawavelength of 495 nm? The index of refraction of the filmis 1.35,and there is air on both sides of the film.
Express your answer in nanometers.
