2 years ago

If a student weighs 100 pounds on Earth, how much more or less would she weigh on Pluto than Mars?

Physics

1 answer:

Sever21 [200]2 years ago

4 0

Answer:

c because that's the answer

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3 years ago

A stationary police car emits a sound of frequency 1240 HzHz that bounces off of a car on the highway and returns with a frequen

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Answer

given,

frequency from Police car= 1240 Hz

frequency of sound after return = 1275 Hz

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Using Doppler's effect formula

Frequency received by the other car

$f_1 = \dfrac{f_0(u + v)}{u}$ ..........(1)

u is the speed of sound = 340 m/s

v is the speed of the car

Frequency of the police car received

$f_2= \dfrac{f_1(u)}{u-v}$

now, inserting the value of equation (1)

$f_2= f_0\dfrac{u+v}{u-v}$

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1.02822(340 - v) = 340 + v

2.02822 v = 340 x 0.028822

2.02822 v = 9.799

v = 4.83 m/s

hence, the speed of the car is equal to v = 4.83 m/s

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