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polet [3.4K]
3 years ago
12

Which of the following graphs shows the relationship between two variables that obey the inverse square law?​

Physics
1 answer:
blondinia [14]3 years ago
8 0

Well, if we've been paying attention in class, we already KNOW that the electrostatic force changes as the inverse square of the distance, and the top graph is conveniently labeled "Electrostatic Force".

But if we didn't already know that, we'd have to examine the graphs, and find the one where 'y' changes like 1/x² .

The top graph does that.  After 1 unit of time, the force is 350.  Double the time to 2 units, and the force should drop to 1/4 of 350 ... sure enough, it's a little less than 90.  Double the time again, to 4 units, and it should drop to 1/4 of a little less than 90 ... by golly, it's down below 30.

The first graph is what an inverse square looks like.  Now that you've worked out this graph, you'll know an inverse square relationship whenever you see it.  

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A car speeding down the highway honks its horn, which has a frequency 392 Hz, but a resting bystander hears the frequency 440 Hz
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Answer:

37.42 m/s

Explanation:

We know that apparent frequency, \bar f is given by

\bar f=f\frac {V}{V-V_s} where f is the given frequency in this case 392, V is the speed of sound in air which is given as 343 and V_s is the speed of car which is unknown, \bar f is given as 440 Hz

440=392\times \frac {343}{343-V_s}\\343-V_s=392\times \frac {343}{440}=305.5818182\\V_s=343-305.5818182=37.41818182\approx 37.42 m/s

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2 years ago
David wants to experiment with the device, so he connects an ammeter into the circuit and measures 11.5 AA when the device is co
Mandarinka [93]

Answer:

2.42hours

Explanation:

To calculate the time taken to boil the cup of water, we will use the formula

Q = It where

Q is the total energy required to boil the water = 100KJ = 100,000Joules

I is the current = 11.5A

t is the time taken to boil the water

t = Q/I

t = 100,000/11.5

t = 8695.65seconds

t = 2.42hours

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3 years ago
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Badminton is only an individual sport<br><br> True<br> False<br><br> (This is gym)
Alekssandra [29.7K]

Answer:

false

Explanation:

7 0
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A piece of amber is charged by rubbing with a piece of fur. If the net excess charge on the fur is 8.9 nC ( 8.9 10-9 C), how man
Alika [10]

Answer:

Number of electrons, n=5.56\times 10^{10}

Explanation:

Given that,

Charge on the fur, q=8.9\ nC=8.9\times 10^{-9}\ C

A piece of amber is charged by rubbing with a piece of fur. We need to find the electrons were added to the amber. It can be calculated using the quantization of charge as

q = n × e

Where

n is the number of electrons

e is the charge on electron

n=\dfrac{q}{e}

n=\dfrac{8.9\times 10^{-9}}{1.6\times 10^{-19}}

n=5.56\times 10^{10}\ electrons

So, n=5.56\times 10^{10}\ electrons number of electrons are added to the amber. Therefore, this is the required solution.

7 0
3 years ago
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