Aspeaker fixed to a moving platform moves toward a wall, emitting a steady sound with a frequency of 225 hz . a person on the platform right next to the speaker detects the sound waves reflected off the wall and those emitted by the speaker. part a how fast should the platform move, vp, for the person to detect a beat frequency of 7.00 hz ? take the speed of sound to be 344 m/s. express your answer

To solve this problem it is necessary to apply the concepts related to the Doppler effect. The frequency would be defined as

Where,

c = Speed of waves in the medium

= Speed of the receiver relative to the medium

= Speed of the source relative to the medium

= emitted frequency

Our values are given as,

Beat frequency = 7Hz

Reflective Doppler frequency = 225+7=232Hz

Speed of sound (c) = 344m/s

Replacing,

Therefore the platform move around 5.268m/s

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

answer///terminator or twilight zone;