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3 years ago

in which of the three cities listed in the data table would seismographs detect the earthquake first? Last?

Physics

1 answer:

makkiz [27]3 years ago

7 0

One little piece of information I think you left out of your question:

WHERE did the earthquake occur ? ?

It's going to make a big difference.

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The physical and chemical properties of a substance are used to identify the substance and to see how it will behave in the pres

pentagon [3]

Im going to guess on this one, and say that it is chemical.

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3 years ago

Read 2 more answers

At noon, ship A is 110 km west of ship B. Ship A is sailing east at 20 km/h and ship B is sailing north at 15 km/h. How fast is

Katyanochek1 [597]

Answer:

$4.47\ \text{km/h}$

Explanation:

$\dfrac{da}{dt}$ = Rate at which the distance between A and starting point of B is changing = -20 km/h

$\dfrac{db}{dt}$ = Rate at which the distance of B is changing = 15 km/h

$\dfrac{dc}{dt}$ = Rate at which the distance between A and B is changing

Time after which the rate at which the distance between A and B is changing is 4 hours

Distance covered by A in 4 hours = $20\times 4=80\ \text{km}$

a = Distance remaining to the start point of B = $110-80=30\ \text{km}$

b = Distance covered by B in 4 hours = $15\times 4=60\ \text{km}$

Distance between A and B after 4 hours

$c=\sqrt{a^2+b^2}\\\Rightarrow c=\sqrt{30^2+60^2}\\\Rightarrow c=67.08\ \text{km}$

$c^2=a^2+b^2$

Differentiating with respect to time we get

$c\dfrac{dc}{dt}=a\dfrac{da}{dt}+b\dfrac{db}{dt}\\\Rightarrow \dfrac{dc}{dt}=\dfrac{a\dfrac{da}{dt}+b\dfrac{db}{dt}}{c}\\\Rightarrow \dfrac{dc}{dt}=\dfrac{30\times -20+60\times 15}{67.08}\\\Rightarrow \dfrac{dc}{dt}=4.47\ \text{km/h}$

The rate at which the distance between the ships is changing at 4 PM is $4.47\ \text{km/h}$ .

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3 years ago

Which of the following does not serve as a way to neutralize the charge in a body?

Brrunno [24]

Answer:

B. Adding more protons to a positively charged body until the number of protons matches the number of electrons

Explanation:

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4 years ago

The distance between tow objects is increased by 3 times the original distance. How will this change the force of attraction bet

lys-0071 [83]

Answer:

force of attraction will be increased by 9

Explanation:

force of attraction is inversely proportional to square of distance

i.e F= 1/R²

F=1/3R²

F=1/9R

multiply both side by 9

9×F= 9×1/9R

9F= 1/R

so force of attraction is 9 times

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3 years ago

How to get infinite thanks could you show me please ☺️

murzikaleks [220]

Answer: divide by zero, or square root of a negative

Explanation: If your question is how to get infinity as an answer to a problem, that generally means that the answer is undefined or doesn't exist.

A couple of ways to get that...

You try to divide by zero. In other words, a problem that asks you to perform something like this: 5/0= or 23/(4-4)= Such a problem will give you an error on a calculator because the answer is infinity or doesn't exist.
Another way is to try to get the square root of a negative number. That answer doesn't exist as a real number, so $\sqrt{-4\\}$ will also give you an error on a calculator.

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3 years ago

in which of the three cities listed in the data table would seismographs detect the earthquake first? Last?﻿

in which of the three cities listed in the data table would seismographs detect the earthquake first? Last?