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3 years ago

How do soaring birds utilize convection? A : They use the warm air to stay warm.

Physics

1 answer:

Zepler [3.9K]3 years ago

8 0

Answer:

Option B. They use thermal updrafts to stay aloft

Explanation:

The sunlight warms the surface of the earth during noon and morning time and when this warming of the Earth's surface is not evenly done or uniform then this gives rise to the thermals. These are the rising air columns and rises when the air nearest to the earth heats up.

This is how some birds like vultures make use of the thermal updrafts to maintain flight.

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A film of oil that has an index of refraction of 1.45 rests on an optically flat piece of glass of index of refraction n = 1.60.

blagie [28]

Answer:

442.75862 nm

Explanation:

m = Order

n = Refractive index

$\lambda$ = Wavelength

We have the relation of thickness and wavelength given by

$2nt=m\lambda$

The consecutive spectral line is given by

$2nt=(m+1)\lambda$

So,

$\lambda=\dfrac{2nt}{m}\\\Rightarrow 642=\dfrac{2nt}{m}$

and

$428=\dfrac{2nt}{m+1}$

Dividing the wavelengths we get

$\dfrac{642}{428}=\dfrac{m+1}{m}\\\Rightarrow 1.5 m=m+1\\\Rightarrow m=\frac{1}{0.5}\\\Rightarrow m=2$

$t=\dfrac{m\lambda}{2n}\\\Rightarrow t=\dfrac{2\lambda}{2n}\\\Rightarrow t=\dfrac{642}{1.45}\\\Rightarrow t=442.75862\ nm$

The film thickness of oil is 442.75862 nm

8 0

3 years ago

The spring, initially at rest, was compressed by the blue box by 0.15 m. The spring constant of the spring is 300 N/m. The mass

Setler [38]

Answer:

1.72m

Explanation:

Step 1:

Data obtained from the question.

Displacement (x) = 0.15 m

Spring constant (K) = 300 N/m

Mass (m) = 0.2 kg

Height (h) =?

Step 2:

Determination of the energy in the spring.

The energy is a spring can be obtained by the following equation:

E = 1/2 kx^2

E = 1/2 x 300 x 0.15^2

E = 150 x 0.0225

E = 3.375J

Step 3:

Determination of the maximum height.

At maximum height, the energy stored is the spring is equal to the potential energy i.e

Energy stored in the string = potential energy

E = P.E

Recall:

Potential energy = mgh

Where:

m is the mass = 0.2kg

g is the acceleration due to gravity = 9.8m/s2

h is the height. =?

Potential energy (P.E) = 3.375J

PE = mgh

3.375 = 0.2 x 9.8 x h

Divide both side by 0.2 x 9.8

h = 3.375/ (0.2 x 9.8)

h = 1.72m

Therefore, the maximum height of the box is 1.72m

8 0

3 years ago

A bike travels at a constant speed of 4.0m/s for 5 seconds. How far it goes ?

alex41 [277]

The speed of 4m/s means that the bike goes 4 meters for each second of movement. Multiplying this by 5 seconds we have a total distance travelled of 20m.

3 0

3 years ago

Read 2 more answers

If the only force exerted on a star far from the center of the Galaxy (r = 7.40 ✕ 1020 m) is the gravitational force exerted by

lina2011 [118]

Answer:

The value is $v = 1.309*10^{5}\ m/s$