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3 years ago

5

Why does the shape of the lens in your eye change?

2 answers:

umka2103 [35]3 years ago

7 0

Answer:

to focus the light

Nina [5.8K]3 years ago

3 0

The Lens Changes Shape to Focus Near Objects. Light rays from objects that are close to the eye are not parallel. Therefore, the eye must bend them more in order to focus the rays on the retina. To accomplish this, the lens change shape.

<h3>Hope this helps</h3>

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When traveling at top speed, a roller coaster train with a mass of12,000 kg has a velocity of 30 m/s. The kinetic energy of the

uysha [10]

Answer:

<em>The kinetic energy of the train at top speed is 5,400,000 J</em>

Explanation:

<u>Kinetic Energy </u>

It's the capacity that an object has to do work in virtue of its velocity. If we use UI units for the mass and velocity, the kinetic energy is expressed in Joules, or Nw.m or $Kg.m^2/sec^2$ . It can be computed with the formula

$\displaystyle K=\frac{mv^2}{2}$

The roller coaster train has a mass of 12,000 kg and a velocity of 30 m/s. Replacing those values in the formula, we have:

$\displaystyle K=\frac{12,000\ 30^2}{2}$

$\displaystyle K=\frac{12,000\ 900}{2}$

$\displaystyle K=5,400,000\ J$

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4 years ago

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The difference between the mass of the nucleus and the mass of the nucleons it contains is converted into ? that holds the nucle

Xelga [282]

Answer:

Binding energy

Explanation:

The energy required to bind the nucleus is called binding energy.

Binding energy is equal to the product of mass defect and square of velocity of light.

Mass defect is the difference of mass of neucleons and the mass of atom.

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3 years ago

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The suspension system of a 2100 kg automobile "sags" 8.5 cm when the chassis is placed on it. Also, the oscillation amplitude de

Gennadij [26K]

Answer:

Part a)

$k = 6.06 \times 10^4 N/m$

Part b)

$b = 1795.4 kg/s$

Explanation:

Part a)

as the mass of the suspension system is given as

$m = 2100 kg$

also we have

$x = 8.5 cm$

so now for force balance we have

$mg = kx$

$(525)(9.81) = k(0.085)$

$k = 6.06 \times 10^4 N/m$

Part b)

Now we know that amplitude decreases by 63% in each cycle

so after one cycle the amplitude will become 37% of initial amplitude

so it is given as

$A = 0.37 A_o$

also we know

$A = A_o e^{-bt/2m}$

$0.37 A_o = A_o e^{-bt/2m}$

$\frac{bt}{2m} = 1$

$b = \frac{2m}{t}$

here t = time period of one oscillation

so it is

$t = 2\pi\sqrt{\frac{m}{k}}$

$t = 2\pi\sqrt{\frac{525}{6.06 \times 10^4}}$

$t = 0.58 s$

now damping constant is

$b = \frac{2(525)}{0.58}$

$b = 1795.4 kg/s$

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4 years ago

Alex swims at an average speed of 4.5 m/s how far does he swim in one minute 24 seconds

Zepler [3.9K]

Answer:

378

Explanation:

60 seconds in one minute

add the 24 seconds

multiply it by 4.5

60 + 24 = 84

4.5 x 84 = 378

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3 years ago

What is it called the number that tells how much of something there is

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A cardinal númber is a number that says how many of something there are such a one , two , three , four , five

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3 years ago