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3 years ago

What is the momentum of a bus that weighs 13,500,000 grams traveling at 65 mph?

Physics

1 answer:

Goryan [66]3 years ago

5 0

The momentum of the bus is $3.93\cdot 10^5 kg m/s$

Explanation:

The momentum of an object is given by

$p=mv$

where

m is the mass of the object

v is its velocity

For the bus in this problem, we have

$m=13,500,000 g = 13,500 kg$ is its mass

$v=65 mph \cdot \frac{1609 m/mi}{3600 s/h}=29.1 m/s$ is the velocity, converted into SI units

Substituting into the equation, we find the momentum of the bus:

$p=(13,500)(29.1)=3.93\cdot 10^5 kg m/s$

Learn more about momentum:

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Let vb be the velocity of the motorboat and let vs be the velocity of the stream.

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1 year ago

A siren on the top of the police car emits sound at frequency of 823 Hz. The car is approaching a bystander on a sidewalk at spe

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Answer:

The bystander will hear a frequency of 931.18 Hz.

Explanation:

let V = 39.5 m/s be velocity of the police car and Fs be the frequency a siren of the police car emits. let v = 0 m/s be the velocity of the bystander and Vs = 340 m/s is the velocity of sound in air.

then, we know that the bystander has to hear a higher frequency than the one emitted and the frequency that the bystander hears is given by the doppler relation:

Fo = [(Vs)/(Vs - V)]×Fs

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= [(340)/(340 - 39.5)]×(823)

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Therefore, the bystander will hear a frequency of 931.18 Hz.

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2 years ago

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Answer:

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