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3 years ago

What color would a yellow cloth appear to have if illuminated with sunlight?

1 answer:

4 0

The colour we see is a measure of the wavelengths of light nor absorbed by the cloth. We would call the colour of the cloth blue if it absorbed longer wavelengths of yellow/orange/red. Sunlight contains all the visible wavelengths. Whatever is not absorbed is reflected.

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22. Kerry Klutz drops her physics book off her aunt’s high rise balcony. It hits the ground below 1.5 s later.

murzikaleks [220]

A). Gravity makes falling objects fall 9.8 m/s faster every second.
After 1.5 seconds, it's falling at (1.5 x 9.8) = 14.7 m/s .

b). The average speed of the physics book is (1/2) (0 + 14.7) = 7.35 m/s .

Falling at an average speed of 7.35 m/s for 1.5 seconds,
the book falls

(1.5 x 7.35) = 11.025 meters

6 0

4 years ago

Read 2 more answers

A ball on a frictionless plane is swung around in a circle at constant speed. The acceleration points in the same direction as t

Kitty [74]

I believe it is False, only because the plane is Frictionless. Hope this helps, good luck.

4 0

3 years ago

Read 2 more answers

An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its pla

Vikentia [17]

Answer:

The new energy density is same as initial energy density u0 as it is independent of plate dimensions

Explanation:

As we know that energy density is total energy per unit volume

so we know that isolated plates of capacitor is placed here

$C = \frac{\epsilon_0 A}{d}$

here we have energy density given as

$u = \frac{Q^2}{2(\epsilon_0 A/d)} Ad$

so we have

$u = \frac{Q^2d^2}{2\epsilon_0}$

so it is independent of the dimensions of the plate while total charge on the plates is constant always

so energy density will not change and remains the same

8 0

3 years ago

Which spacecraft carried the first Spacelab? -Columbia -Challenger -Discovery -Atlantis

Nat2105 [25]

The Atlantis spacecraft carried the first space lab.

Answer: Option 4

<u>Explanation: </u>

The first space lab is named as ATLAS 1 which is the abbreviation of Atmospheric Laboratory for Applications and Science. It is a short space lab set up in space to observe the atmospheric changes and other scientific experiments in the outer atmosphere of Earth from space.

It contains hi-tech instruments and facilities. It was a part of Phase I of NASA’s mission to planet Earth. This helped in better understanding of Earth’s outer and inner atmosphere. So, the spacecraft used to carry the ATLAS 1 is named as Atlantis.

4 0

3 years ago

Your film idea is about drones that take over the world. In the script, two drones are flying horizontally at the same speed and

Stella [2.4K]

Answer:

vₓ = 20 m/s, v_{y} = -15 m / s

Explanation:

This is a conservation of moment problem, since it is a vector quantity we can work each axis independently

The system is formed by the two drones, so the forces during the crash are internal and the moment is conserved

X axis

Initial moment. Before the crash

p₀ = m₁ v₀ₓ + m₂ v₀ₓ

Final moment. After the crash

p_{fx} = (m₁ + m₂) vₓ

p₀ₓ = $p_{fx}$

m₁ v₀ₓ + m₂ v₀ₓ = (m₁ + m₂) vₓ

vₓ = (m₁ + m₂) v₀ₓ / (m₁ + m₂)

vₓ = v₀ₓ = 20 m/s

Y Axis

Initial

p_{oy} = m₁ v_{oy}

Final

p_{fy} = (m₁ + m₂) v_{y}

p_{oy} = p_{fy}

the drom rises and when it falls it has the same speed because there is no friction v_{oy} = -60 m/s

m₁ $v_{oy}$ = (m₁ + m₂) v_{y}

v_{y} = m₁ / (m₁ + m₂) v_{oy}

v_{y} = 1/4 60

v_{y} = -15 m / s

Vertical speed is down

5 0

4 years ago