2 years ago

If a truck travels 100 miles in 2 hours, what is its speed?

Physics

2 answers:

densk [106]2 years ago

6 0

Answer:

50 miles/hr

Explanation:

$Distance = 100\: miles\\Time = 2\:hours\\\\Speed = \frac{Distance}{Time} \\\\Speed = \frac{100\:miles}{2\:hours}\\\\ Speed = 50\:miles/hour$

miskamm [114]2 years ago

5 0

Answer:50 miles per hour 50/1hr

Explanation:100 divided by 2 is 50, divide 2 by 2 thats 1

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What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 116 km/h and emitting a steady 950 Hz so

Arte-miy333 [17]

To solve this problem we will apply the concepts related to the Doppler Effect, defined as the change in apparent frequency of a wave produced by the relative movement of the source with respect to its observer. Mathematically it can be written as

$f_{obs} = f(\frac{v_w}{v_w-v_s})$

Here,

$f_s$ = Frequency of the source

$v_w$ = Speed of the sound

$v_s$ = Speed of source

Now the velocity we have that

$v_s = 116km/h (\frac{1000m}{1km})(\frac{1h}{3600s})$

$v_s = 32.22m/s$

Then replacing our values,

$f_{obs} = (950Hz) (\frac{345m/s}{345m/s-32.22m/s})$

$f_{obs} = 1047.86Hz$

Therefore the frequency of the observer is 1047.86Hz

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