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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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Explain how gravity and friction work to slow down a kicked soccer ball.

goblinko [34]

Use your feet to stop it since it is soccer you can't use your hands!!!! P.S. you can't use gravity.

5 0

3 years ago

A car accelerates from rest at 2 m/s. what is the speed after 8 sec?

beks73 [17]

Answer:

16m/s

Explanation:

$v_{f}=v_{i}+at$

$v_{f}=0+2\cdot8$

$v_{f}=16\ \frac{m}{s}$

Therefore, the speed after 8 seconds is 16m/s

6 0

3 years ago

What is the effective resistance r of the two-resistor system? express the effective resistance in terms of r1 and r2?

Alekssandra [29.7K]

As per the question, the resistor system contains two resistors.

The two resistors are denoted as $r_{1}\ and\ r_{2}\ respectively$

We are asked to calculate the effective resistance in terms of $r_{1}\ and\ r_{2}\ respectively$

The two resistors can be connected in two ways.

CASE-1: Let the resistors are connected in series.

When the resistors are connected in series, the effective resistance is the algebraic sum of the individual resistors.

Hence, the effective resistance $r= r_{1} +r_{2}$ [ans]

CASE-2: Let the resistors are connected in parallel.

The effective resistance is calculated as follows-

$\frac{1}{r}= \frac{1}{ r_{1}}+ \frac{1}{r_{2}}$

$=\frac{r_{1}+ r_{2}} {r_{1} r_{2}}$

⇒ $r =\frac{r_{1} r_{2}} { r_{1} +r_{2}}$ [ans]

4 0

4 years ago

Find the kinetic energy K of a satellite with mass m in a circular orbit with radius R. Express your answer in terms of m, M, G,

ratelena [41]

Answer:

$K=\frac{GmM}{2R}$

Explanation:

The kinetic energy is defined as:

$K=\frac{mv^2}{2}(1)$

Here, m is the object's mass and v its speed. In this case the speed of the satellite is the orbital speed, which is given by:

$v_{orb}=\sqrt\frac{GM}{R}(2)$

Here, G is the gravitational constant, M is the mass of the object that the satellite is orbiting and R is the radius of its circular orbit. Replacing (2) in (1):

$K=\frac{mv_{orb}^2}{2}\\K=\frac{m(\sqrt\frac{GM}{R})^2}{2}\\K=\frac{GmM}{2R}$

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4 years ago

What are some examples of uses of minerals? Select 3 choices.

julia-pushkina [17]

Answer:

salt, toothpaste, and applesauce

Explanation:

All of these have minerals in them. Hope this helps! :)

5 0

3 years ago

Read 2 more answers