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3 years ago

7

WILL GIVE BRAINLIEST!!! (100 points) cliff divers in hawaii dive from 65 meter high cliffs. the rocks at the base of the cliff p

rotrude 27 meters beyond the edge of the cliff. which sketch is the correct representation of the problem?
answer asap please:)

1 answer:

Dennis_Churaev [7]3 years ago

8 0

choice 3 because the arrow has to be downward for as. and if the divers want to live, the vx has to be going right and not 0 or they would hit the rocks. I hope it's right!

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What produces the distinctive flame color of different substances when they are ignited?

shepuryov [24]

Answer:

Electrons in different metals

Explanation:

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.

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3 years ago

A car advertisement claims their car can go from a stopped position to 60 miles per hour in 5 seconds. The advertisement is desc

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Answer:

Acceleration

Explanation:

The advertisement is describing the acceleration of the car.

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u is the initial velocity

t is the time taken

Any quantity that specifies the rate of change of velocity of a body within a given time frame is describing its acceleration.

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3 years ago

A ball is thrown vertically upward with an initial speed of 18 m/s. then, 0.73 s later, a stone is thrown straight up (from the

svetoff [14.1K]

Solution:

the boll,

y = Vo t + ½ g t²

y = 18 t + ½ (-9.8) t²

and the second one,

y = Vo t + ½ g t²

y = 30(t – 0.735) + ½ (-9.8)(t - 1.0.735)²

the stone and the ball will pass each other if,

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t = 1.8196 sec

y = 18 t + ½ (-9.8) t²

y = 18(1.8196) + ½ (-9.8)(1.8196)²

y = 16.5292 m above initial point

Thus, this the required solution.

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3 years ago

Ablok slides on ahorizonted sur fors which has been lubricated with heavy oil such that the blok soffers a viscous resistance th

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Answer:

$v = (v_0^{\frac{3}{2}}-\frac{3cx}{2m})^\frac{2}{3}$

$x = \frac{2m}{c}*v_0^{\frac{3}{2}}$

Explanation:

Given

$f(v) =- cv^\frac{1}{2}$

To start with, we begin with

$F = ma$

Substitute the expression for F

$-cv^\frac{1}{2} = ma$

$-ma = cv^\frac{1}{2}$

Acceleration (a) is:

$a = \frac{dv}{dt}$

So, the expression becomes:

$m\frac{dv}{dt} = -cv^\frac{1}{2}$

-----------------------------------------------------------------------------------------

Velocity (v) is:

$v = \frac{dx}{dt}$ --- distance/time

$v * \frac{dv}{dx}= \frac{dx}{dt}* \frac{dv}{dx}$

$v * \frac{dv}{dx}= \frac{dv}{dt}$

$\frac{dv}{dt} = v * \frac{dv}{dx}$

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So, we have:

$m\frac{dv}{dt} = -cv^\frac{1}{2}$

$mv * \frac{dv}{dx} = -cv^\frac{1}{2}$

Divide both sides by $v^\frac{1}{2}$

$mv^{1-\frac{1}{2}} * \frac{dv}{dx} = -c$

$mv^{\frac{1}{2}} * \frac{dv}{dx} = -c$

Divide both sides by m

$v^{\frac{1}{2}} * \frac{dv}{dx} = -\frac{c}{m}$

$v^{\frac{1}{2}} * dv = -\frac{c}{m} * dx$

Integrate:

$\int\limits^v_{v_0} {v^{\frac{1}{2}}} \, dv = -\frac{c}{m}\int\limits^x_0 {}} \, dx$

$\frac{2}{3}v^{\frac{3}{2}}|\limits^v_{v_0} = -\frac{c}{m}x|\limits^x_0$

$\frac{2}{3}(v^{\frac{3}{2}} - v_0^{\frac{3}{2}} ) = -\frac{cx}{m}$

$v^{\frac{3}{2}} - v_0^{\frac{3}{2}} = -\frac{3cx}{2m}$

$v^{\frac{3}{2}} = v_0^{\frac{3}{2}}-\frac{3cx}{2m}$

$v = (v_0^{\frac{3}{2}}-\frac{3cx}{2m})^\frac{2}{3}$

Next, is to get the maximum velocity by distance x.

To do this, we find the derivation by x

$\frac{dv}{dx} = 0$

$\frac{2}{3}(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{\frac{2}{3} - 1} * -\frac{3c}{2m} = 0$

$\frac{2}{3}(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{\frac{2-3}{3}} * -\frac{3c}{2m} = 0$

$\frac{2}{3}(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{\frac{-1}{3}} * -\frac{3c}{2m} = 0$

$(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{\frac{-1}{3}} * -\frac{c}{m} = 0$

Divide both sides by $-\frac{c}{m}$

$(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{\frac{-1}{3}} = 0$

Take cube roots of both sides

$(v_0^{\frac{3}{2}}-\frac{3cx}{2m})^{-1} = 0$

$v_0^{\frac{3}{2}}-\frac{3cx}{2m} = 0$

$\frac{3cx}{2m} = v_0^{\frac{3}{2}}$

$x = \frac{2m}{c}*v_0^{\frac{3}{2}}$

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3 years ago

In a nuclear fusion reaction, atoms:

spayn [35]

Answer:

Combine to form heavier elements

Explanation:

as opposed to fission which splits heavier atoms into lighter elements.

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