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2 years ago

With a bar magnet where are the lines of force closest together

Physics

2 answers:

attashe74 [19]2 years ago

8 0

At the tip of either of the magnets poles

MA_775_DIABLO [31]2 years ago

3 0

Answer: at the tips of the magnet

Explanation: charges are more at the tip of a substance so likewise for a magnet

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An airplane wing is designed so that the speed of the air across the top of the wing is 255 m/s when the speed of the air below

grin007 [14]

<h2>Answer:442758.96N</h2>

Explanation:

This problem is solved using Bernoulli's equation.

Let $P$ be the pressure at a point.

Let $p$ be the density fluid at a point.

Let $v$ be the velocity of fluid at a point.

Bernoulli's equation states that $P+\frac{1}{2}pv^{2}+pgh=constant$ for all points.

Lets apply the equation of a point just above the wing and to point just below the wing.

Let $p_{up}$ be the pressure of a point just above the wing.

Let $p_{do}$ be the pressure of a point just below the wing.

Since the aeroplane wing is flat,the heights of both the points are same.

$\frac{1}{2}(1.29)(255)^{2}+p_{up}= \frac{1}{2}(1.29)(199)^{2}+p_{do}$

So, $p_{up}-p_{do}=\frac{1}{2}\times 1.29\times (25424)=16398.48Pa$

Force is given by the product of pressure difference and area.

Given that area is $27ms^{2}$ .

So,lifting force is $16398.48\times 27=442758.96N$

6 0

3 years ago

The direction of the acceleration of an object on a(n) _______________________ path is toward the _______________________ of the

aleksandrvk [35]

Answer:

circular...center

Explanation:

Physics

8 0

3 years ago

You are driving at 40 miles per hour and you speed up to 60 miles per hour over the course of 20 miles. How long were

notka56 [123]

Answer:

120 hours

Explanation:

4 0

2 years ago

Fitness walking reduces the risk of which disease?

IRINA_888 [86]

Answer:

Explanation:

You lose more calories, and are on a lower risk

4 0

2 years ago

Which light packs the highest energy per photon? 1. infrared 2. red 3. blue 4. ultraviolet 5. green?

WINSTONCH [101]

A single photon carries an energy equal to
$E=hf$
where h is the Planck's constant and f is the frequency of the photon.
This means that the higher the frequency of the light, the higher the energy. Among the 5 different options mentioned by the problem, the light with highest frequency is ultraviolet, which has frequencies in the range [3-30] PHz, while visible light (red, blue, green) and infrared have lower frequency, so ultraviolet light has the highest energy per photon.

3 0

2 years ago