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wlad13 [49]
2 years ago
13

Number 11 please I really need help!!

Physics
2 answers:
iVinArrow [24]2 years ago
8 0
The answer is 1 so easy
vichka [17]2 years ago
4 0

Answer:

Th answer is 1-

Explanation:

trust me i have this all on the periodic table thing my school gave lol

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static electricity and friction

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A tennis player smashes a ball of mass m horizontally at a vertical wall. The ball rebounds at the same speed v with which it st
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Answer:

The magnitude of change in momentum is (2mv).

Explanation:

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Let the mass of ball is m. A tennis player smashes a ball of mass m horizontally at a vertical wall. The ball rebounds at the same speed v with which it struck the wall.

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3 years ago
A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with
beks73 [17]

Answer:

4.6 kHz

Explanation:

The formula for the Doppler effect allows us to find the frequency of the reflected wave:

f'=(\frac{v}{v-v_s})f

where

f is the original frequency of the sound

v is the speed of sound

vs is the speed of the wave source

In this problem, we have

f = 41.2 kHz

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vs = 33.0 m/s

Therefore, if we substitute in the equation we find the frequency of the reflected wave:

f'=(\frac{330 m/s}{330 m/s-33.0 m/s})(41.2 kHz)=45.8 kHz

And the frequency of the beats is equal to the difference between the frequency of the reflected wave and the original frequency:

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3 years ago
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