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3 years ago

What is the name given to instruments that sense earthquake waves and transmit them to a recording device?

Physics

1 answer:

zysi [14]3 years ago

4 0

Answer:

seismograph or seismometer.

Explanation:

Seismograph is an instrument used to detect and record earthquakes.

It has a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded. This record is proportional to the motion of the seismometer mass relative to the earth, but it can be mathematically converted to a record of the absolute motion of the ground.

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A hot-air balloon is rising straight up with a speed of 4.6 m/s. a ballast bag is released from rest relative to the balloon at

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The time taken by the ballast bag to reach the ground is 2.18 s

The ballast bag at rest with respect to the balloon has the upward velocity (u) of 4.6 m/s , which is the velocity of the balloon. When it is dropped from the balloon, its motion is similar to an object thrown upwards with an initial velocity u and it falls under the acceleration due to gravity g.

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Use the values in the equation of motion and write an equation for t.

$s=ut+\frac{1}{2} at^2 \\ -13.4=4.6t-\frac{1}{2}(9.8)t^2\\ 4.9t^2-4.6t-13.4=0$

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Answer:

a) fem = - 0.0103 V, b) the applied field is in a vertical upward direction, the induced current is clockwise.

Explanation:

a) For this exercise we use Faraday's law

fem = $- \frac{d \phi}{dty}$

the magnetic flux is

Ф = B. A = B A cos θ

The bold letters indicate vectors, in this case the direction of the magnetic field and the normal to the circumference is parallel therefore the angle is zero and the cos 0 = 1

fem = - B dA / dt

the area of a circle is

A = π r²

et's perform the derivative

dA / dt =π 2r $\frac{dr}{dt}$

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fem = - B 2π r $\frac{dr}{dt}$

the circumference of a circle is

L = 2π r

we substitute

fem = - B L ( L )

fem =

Let's find the circumference for the 9 s, let's use a direct rule of proportions

If the circumference changes 13cm at t = 1. how much does it change at t=9s

ΔL = 13cm (9s / 1s) = 117cm

the circumference that is

L = Lo - ΔL

L = 167 - 117

L = 50 cm

let's reduce all magnitudes to the SI system

L = 0.50 m

= 0.130 m / s

calculate us

fem = - 1.00 0.50 0.130

fem = - 0.0103 V

b) the electromotive force induced in the opposite direction to the change of the radius and is decreasing with time, the current follows the direction of the decreased voltage therefore the current is induced in the opposite direction to the change of the magnetic flux.

If the applied field is in a vertical upward direction, the induced current is clockwise.

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3 years ago