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3 years ago

13

Disturbances inside Earth’s core cause earthquakes. The starting point of the disturbance is called the epicenter. Why does the

amplitude of a seismic wave usually decrease as the wave moves away from the epicenter?

2 answers:

iren [92.7K]3 years ago

8 0

so was the answer correct ?

Natali [406]3 years ago

5 0

The waves lose energy in the form of heat. The frequency of the waves continues to increase. Disturbances inside Earth's core cause earthquakes. The starting point of the disturbance is called the epicenter.

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A student is skateboarding down a ramp that is 6.0 m long and inclined at 180 with respect to the horizontal. The initial speed

dlinn [17]

Answer:

The speed at the bottom of the ramp is 2.6m/s

Explanation:

The final velocity can be determined by means of the equations for a Uniformly Accelerated Rectilinear Motion:

$v_{f}^{2} = v_{i}^{2} + 2ad$

$v_{f} = \sqrt{v_{i}^{2} + 2ad}$ (1)

Notice that it is necessary to found the acceleration that can be done by means of Newton's second law:

The acceleration can be found by means of Newton's second law:

$\sum F_{net} = ma$

Where $\sum F_{net}$ is the net force, m is the mass and a is the acceleration.

$Fx + Fy = ma$ (2)

<em>Force in the x axis:</em>

$F_{x} = W_{x}$

The component of the weight in the x axis can be gotten by means of trigonometric:

$\frac{OC}{H} = sen \theta$

$\frac{W_{x}}{W} = sen \theta$

$W_{x} = W sen \theta$

$W_{x} = mgsen \theta$

$F_{x} = mgsen \theta$ (3)

<em>Forces in the y axis: </em>

$F_{y} = N - W_{y}$ (4)

The component of the weight in the y axis can be gotten by means of trigonometric:

$\frac{AC}{H} = cos \theta$

$\frac{W_{y}}{W} = cos \theta$

$W_{y}= W cos \theta$

Remember that the weight is defined as:

$W = mg$

$W_{y}= mgcos \theta$

The normal force can be obtained from equation (4)

$N - W_{y} = 0$

$N = W_{y}$

$N = mgcos \theta$

Therefore, equation 4 can be rewritten as:

$F_{y} = mgcos \theta - mgcos \theta$

$F_{y} = 0$ (5)

Then, replacing equation 3 and equation 5 in equation 2 it is gotten:

$mgsen \theta + 0 = ma$

$mgsen \theta = ma$ (6)

However, a can be isolated from equation 6

$a = \frac{mgsen \theta}{m}$

$a = gsen \theta$ (7)

Finally, equation 7 can be replaced in equation 2:

$v_{f} = \sqrt{v_{i}^{2} + 2d(gsen \theta)}$

$v_{f} = \sqrt{(2.6m/s)^{2} + 2(6.0m)(9.8m/s^{2})sen 180^{\circ})}$

$v_{f} = 2.6m/s$

Hence, the speed at the bottom of the ramp is 2.6m/s

7 0

3 years ago

All of the following are basic need of young children, except

deff fn [24]

Answer:

C

Explanation:

Coz its like that (ye ik probs wrong ans but ye)

5 0

3 years ago

Read 2 more answers

James decides to walk home from school today. He lives 3 miles from school and can walk home in 45 minutes. At what rate is Jame

Kaylis [27]

B 1 mile/15 minutes is the right one

3 0

3 years ago

Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 ×

Vika [28.1K]

Answer:

Explanation:

First, we can find the mass of the object in air

Since W = mg

m = W/g = (8.9)/(9.8) = 0.908 kg

Then, by Archimedes principle, we can find its volume. The volume is found by the weight of the water displaced by the formula

W = Vρg

The Weight is the difference in scale readings. The density of water is 1000 kg/m3

(8.9- 7.8) = V(1000)(9.8)

Thus V = 1 X 10-4 m3

Then, since density is mass / volume

ρ = 0.908/1 X 10-4

ρ = 8254 kg/m3 which is 8 X 103 kg/m3

The density of gold is 19.3 X 103 kg/m3

Since those densities are not the same, the crown is either hollow or not pure gold

8 0

3 years ago

Hi Guys.I was just wondering if given two specific heat capacities (In my case copper and water) do you add them both together o

timama [110]

Answer:

yes

Explanation:

using law of HC(heat capacity), which is

heat loss=heat gain
energy H=MCQ

Where M is mass of substance,C is specific heat capacity, and Q is temperature change

In case of two substance

the H = Mc*Cc*Q+Mw*Cw*Q(provided the initial and final temperature are given)

8 0

3 years ago