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3 years ago

According to the video, when organisms reproduce sexually, variations (differences)...

Physics

2 answers:

Angelina_Jolie [31]3 years ago

7 0

Answer:

Increase i think

Explanation:

qwelly [4]3 years ago

6 0

I do as well believe it’s increase

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An object is moving with a constant velocity of 278 m/s. How long will it take it to travel 7500 m, using the formula Delta X=Vt

rusak2 [61]

If the velocity is constant then the acceleration of the object is zero.
$a=0 (m/s^2)$
Thus when we apply the equation
$\Delta X=vt+(at^2/2)$
It remains
$\Delta X =vt$
or equivalent
$t=(\Delta X/v) =7500/278 =26.98 (seconds)$

7 0

4 years ago

The light rays in the illustration below do not properly focus at the focal point. this problem occurs with?

tankabanditka [31]

Answer:

The problem occurs with all spherical mirrors.

Spherical mirrors are practical up to about inches in diameter.

Reflecting telescopes use spherical mirrors for apertures up to about 4 ".

Larger aperture telescopes use parabolic mirrors to obtain sharp focus.

7 0

3 years ago

An avant-garde composer wants to use the Doppler effect in his new opera. As the soprano sings, he wants a large bat to fly towa

Brilliant_brown [7]

Answer:

18.94 m/s

Explanation:

The bat becomes the source of sound . Source is moving towards observer

apparent frequency = actual frequency x (V / V - V_s)

V is velocity of sound and V_s is velocity of source or bat.

apparent frequency / actual frequency = V / (V - V_s)

21 / 12 = 340 / (340 - V_s)

1.059(340 - V_s) = 340

340 x .059 = 1.059 V_s

V_s = 18.94 m/s

6 0

4 years ago

NASA is giving serious consideration to the concept of solar sailing. A solar sailcraft uses a large, lowmass sail and the energ

Elan Coil [88]

Answer:

a) the reflective surface has twice the energy transfer

b) A = 1.3 10²⁷ km²

c) the energy emitted by the sun is distributed in a sphere that depends on the square of the distance, and the gravitational force depends on the square of the distance

Explanation:

a) The pressure exerted on the candle is related to the variation of the momentum

P = $\frac{1}{c} \ \frac{dp}{dt}$

in a case of absorption (inelastic shock) all the energy is absorbed therefore the pressure is

P = \frac{1}{c} \ \frac{dp}{dt}

in the case of reflection (elastic shock) an energy is absorbed by absorbing the light and then by action and reaction the same energy is absorbed in the reflected light

P = 2 \frac{1}{c} \ \frac{dp}{dt}

In conclusion, the reflective surface has twice the energy transfer.

b) pressure is defined with force per unit area

P = F / A

F = P A

this force must be greater than the gravitational force of attraction of the sun

Fg = G m Ms / r²

let's look for the case that the two forces are equal

F = Fg

P A_sail = G m Ms = r²

suppose a fully reflective sail

$2 \frac{S}{c} \ A_{sail} = G \frac{m M_s}{r^2}$

The pointing vector is the power delivered per unit area

S = I = P / A

where A is the area of the sphere where the is distributed by the sun

A = 4π r²

we substitute

$\frac{2P}{c} \ \frac{A_{sail}}{4 \pi r^2} = G \frac{m M_s}{r^2}$

$\frac{1}{2 \pi \ c }$ A_{sail} = G m M_s

A = G m M_s 2π c

let's calculate

A = 6.67 10⁻¹¹ 10000 2 10³⁰ 2π 3 10⁸

A = 1,257 10³³ m²

let's reduce to km²

A = 1.3 10³³ m² (1km / 10³ m) ²

A = 1.3 10²⁷ km²

c) The size of the candle is independent of the distance to the sun because the energy emitted by the sun is distributed in a sphere that depends on the square of the distance, and the gravitational force depends on the square of the distance, therefore the two dependencies are canceled.

8 0

3 years ago

If an earthquake occurred in Miami, Florida, then how long would it take for a seismic station in Seattle, Washington, to pick u

Juliette [100K]

0.017s

Explanation:

Given parameter

Distance = 5000km = 5 x 10⁶m

Unknown:

time taken = ?

Solution:

We use the normal speed equation to solve this problem as we take the speed of the wave to be 3 x 10⁸m/s.