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4 years ago

Animal cells contain all of the following structures EXCEPT a

Physics

2 answers:

ololo11 [35]4 years ago

3 0

Except a Chlorophyll, cell wall, vacuole ...........you can choose any of them

alexgriva [62]4 years ago

3 0

Yeah I think it is Cell wall

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Which energy conversion takes place when a solar cell is used to light a street lamp?

professor190 [17]

Answer:

SOLAR TO LIGHT ENERGY

Explanation:

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3 years ago

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The___ if a gas can affect the pressure of a gas

sergejj [24]

I think it’s D I am sorry if I am wrong

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3 years ago

Two cylindrical resistors are made from same material and have the same length. When connected across the same battery, one diss

Ilia_Sergeevich [38]

Answer:

$\frac{d_2}{d_1} = \sqrt2 = 1.41$

Explanation:

As resistor is connected to the battery of constant EMF then the power across the resistor is given as

$P = \frac{E^2}{R}$

now if two resistors are made up of same material and of same length then due to different cross sectional area they both have different resistance

Due to different resistance they both will have different power

Since power is inversely depends on the resistance

So if the power is twice that of the other then the resistance must be half

so we have

$R_1 = \rho \frac{L}{A_1}$

$R_2 = \rho\frac{L}{A_2}$

since one resistance is half that of other resistance

So the area of one must be twice that of other

so we have

$\frac{A_2}{A_1} = 2$

$\frac{\pi d_2^2}{\pi d_1^2} = 2$

$d_2 = 1.41 d_1$

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3 years ago

How would cars fly what would keep them flying

diamong [38]

Two weeks ago I would have said flying cars were still firmly in the realm of techno-utopian fantasy, as they have been for decades. Now I’m not quite so sure.

In the coming few years nearly 20 small airborne vehicles are supposedly hitting the market (see table below). Some are drone-like, with anywhere from four to 18 rotors keeping them aloft. Most are fixed-wing craft with propellers that point upwards for vertical takeoff and landing (VTOL), and tilt forward for flight.

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3 years ago

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You go rock climbing with a pack that ways 79 N and you reach a height of 30 m. How much work did you do to lift your pack? If y

Vanyuwa [196]

When you climb, earth exerts gravitational force on pack in downward direction(pointing towards the center of earth).
In order to climb, you need to work against work done by gravity on the pack.
Hence work done by you = work done by gravity on pack
= Force x displacement = 70 x 30 = 2100 J.

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3 years ago