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3 years ago

Before the widespread use of computers, how was the epicenter of an earthquake determined?

2 answers:

7 0

Data was used from three different stations. Where their data overlapped was where the epicenter was located.
it is called triangulation

STALIN [3.7K]3 years ago

7 0

Data was used from three different stations. Where their data overlapped was where the epicenter was located.

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A dog runs east for 21.25 meters. it takes the dog 8.5 seconds to cover this distance. what is the dog's average velocity?

Aleonysh [2.5K]

Velocity=21.25/8.5
= 2.5m/s
answers is b

6 0

3 years ago

Consider a grain of table salt which is made of positive

morpeh [17]

Answer:

Force, $F=8.23\times 10^{-8}\ N$

Explanation:

It is given that,

Each ion in Na⁺ and Cl⁻ has a charge of, $q=1.6\times 10^{-19}\ C$

Distance between two ions, $d=5.29\times 10^{-11}\ m$

We need to find the electrostatic force. It is given by :

$F=k\dfrac{q_1q_2}{d^2}$

$F=9\times 10^9\times \dfrac{(1.6\times 10^{-19})^2}{(5.29\times 10^{-11})^2}$

$F=8.23\times 10^{-8}\ N$

So, the magnitude of electrostatic force between them is $F=8.23\times 10^{-8}\ N$ . Hence, this is the required solution.

3 0

3 years ago

Latent heat of fusion definition and explanation

pogonyaev

Answer:

The enthalpy of fusion of a substance, also known as heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

5 0

3 years ago

Nabil wants to work out the density of a pebble. he has a displacement can and a beaker. What other piece of equipment will he n

Svetllana [295]

Answer:

1) Measuring cylinder

2) Top Pan Balance

Explanation:

To find the density of the pebble Nabil should first accurately measure the mass of the pebble using the top pan balance

He should then fill the displacement can till the water reaches the outlet pipe at the to of the cylinder

He should then place the pebble into the cylinder carefully ans allow the water that would start coming out to stop

The volume of water in the displaced cylinder is then measured and the density is found by dividing the mass of the pebble by the volume of water in the measuring cylinder

$Density \ of \ pebble = \dfrac{Pebble \ mass}{Volume \ of \ water \ in\ the \ measuring \ cylinder} = \dfrac{Pebble \ mass}{Water \ volume \ displaced}$

3 0

3 years ago

1. Question

Paraphin [41]

All of the forces listed are correct. There are 4 presently known forces.
Second question os B. the Lorentz force. It's given by
F=q(E+VxB) where q is the electric charge, E is the electric field, V is the particle's velocity vector, B is the magnetic flux density, and "x" represents the vector cross product.

6 0

3 years ago