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3 years ago

Someone please helpp!

Physics

1 answer:

Nuetrik [128]3 years ago

8 0

Answer:

bats locate food using sound wave by there ears

Explanation:

there ears can her everything

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Light travels at a speed of close to 3 x 10^5 km/s in vacuum. Given that it takes light 8 min and 19 s to travel the distance fr

never [62]

Answer:

1497×10⁵ km

Explanation:

Speed of light in vacuum = 3×10⁵ km/s

Time taken by the light of the Sun to reach the Earth = 8 min and 19 s

Converting to seconds we get

8×60+19 = 499 seconds

Distance = Speed × Time

$\text{Distance}=3\times 10^5\times 499\\\Rightarrow \text{Distance}=1497\times 10^5\ km$

1 AU = 1497×10⁵ km

The Sun is 1497×10⁵ km from Earth

8 0

3 years ago

Coherent light with wavelength 610 nm passes through two very narrow slits, and theinterference pattern is observed on a screen

andriy [413]

Answer:

= 1220 nm

= 1.22 μm

Explanation:

given data:

wavelength $\lambda = 610 nm = 610\times 10 ^{-9} m$

distance of screen from slits D = 3 m

1st order bright fringe is 4.84 mm

condition for 1 st bright is

$d sin \theta =\lambda$ ---( 1)

and $tan \theta = \frac{y}{ D}$

$\theta = tan^{-1}\frac{(y }{D})$

= 0.0924 degrees

plug theta value in equation 1 we get

$d sin ( 0.0924) = 610 \times 10 ^{-9}$

$d = 3.78\times 10^{-4} m$

condition for 1 st dark fringe

$d sin \theta =\frac{λ'}{2}$

$\lambda '= 2 d sin\theta$

= 2λ since from eq (1)

= 1220 nm

= 1.22 μm

7 0

3 years ago

The color of an object we see is determined by the

aksik [14]

Answer:

An object appears white when it reflects all wavelengths and black when it absorbs them all. Red, green and blue are the additive primary colors of the color spectrum. Combining balanced amounts of red, green and blue lights also produces pure white.

Explanation:

7 0

3 years ago

A jet aircraft is traveling at 262 m/s in horizontal flight. The engine takes in air at a rate of 85.9 kg/s and burns fuel at a

Fittoniya [83]

Answer:

$F_T=60132.52N$

$P=15814852.76W$

Explanation:

From the question we are told that

Velocity of aircraft $V=263m/s$

Engine air intake rate $\triangle M_a=85.9kg/s$

Fuel burn rate $\triangle M_f =3.92kg/s$

Velocity of exhaust gas $V_e =921m/s$

Generally the Mass change rate of Rocket is mathematically given by

$\triangle M = \triangle M_a+\triangle M_f$

$\triangle M= 85.9+3.92$

$\triangle M=89.82kg/s$

Generally the Trust of the rocket is given mathematically by

$F_T=(\triangle M *V_e)-(dM_a/dt)*(V)$

$F_T=(89.82 *921)-(85.9)*(263)$

$F_T=60132.52N$

Generally the Rocket's delivered power is mathematically given by

Delivered power P

$P=V*F_T$

$P=263*60132.52N$

$P=15814852.76W.$

8 0

3 years ago

Which front formed widespread clouds rain or snow

Karolina [17]

Answer: A cold front occurs when cold, denser air replaces the rising, less dense air mass. The reason this front brings in the rain is that as the rising warm air cools (as it rises to the cooler upper atmosphere) the moisture in it condenses into clouds that precipitate down as rain or snow.

8 0

3 years ago

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