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3 years ago

Why should you use control while during an experiment?

Physics

1 answer:

Sergio039 [100]3 years ago

8 0

To provide a greater certainty that the observed results are not by chance.

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The wavelengths for visible light rays correspond to which of these options?

elena-s [515]

Answer;

About the size of a virus or a large molecule

Explanation;

Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes.

Visible light falls in the range of the EM spectrum between infrared (IR) and ultraviolet (UV). It has frequencies of about 4 × 1014 to 8 × 1014 hertz (Hz) and wavelengths of about 740 nanometers (nm) to 380 nm .

The wavelength of visible light corresponds to the size of a virus or a large molecules which ranges from about 20 to 400 nanometres in diameter.

6 0

3 years ago

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A loaf of bread is removed from an oven and is left sitting in the kitchen to cool. Its temperature t minutes after being remove

Darya [45]

<h2>Answer:</h2>

(a). 73° C.

(b). 176° C.

(c). 93.02°C.

<h2>Explanation:</h2>

In the question,

We have been given an equation,

$T(t) = 103e^{-0.0182t}+73.$

(a).

We need to find the temperature of the kitchen,

So,

Time, t → ∞

On putting the value of t as infinite in the equation we get,

$T(\infty)=103e^{-0.0182*\infty}+73\\T(\infty)=103*0+73\\T(\infty)=0+73\\T(\infty)=73\\$

Therefore, the temperature of the Kitchen is 73° C.

(b).

The initial temperature of the bread when it is removed from the oven is at, t = 0 s

So,

On putting the value of t = 0, we get,

$T(t) = 103e^{-0.0182t}+73.\\T(0)=103e^{-0.0182\times 0} + 73\\T(0)=103+73\\T(0)=176$

Therefore, the initial temperature of the bread is 176° C.

(c).

On putting the value of t = 90 minutes, we get,

$T(t) = 103e^{-0.0182t}+73.\\T(90)=103e^{-0.0182\times 90} + 73\\T(90)=20.0199+73\\T(90)=93.02$

Therefore, the temperature of the bread after 90 minutes is 93.02°C.

8 0

3 years ago

A set of statements that belong together as a group and contribute to the function definition is known as a(n) ________.

dsp73

Block. hope this helps.

5 0

3 years ago

You accidentally slide a glass of iced tea off a table that is 0.75 m tall. How

Marizza181 [45]

Answer:

Explanation:

$s= \frac{1}{2} gt ^{2}$

s=0.75

g=10

3 0

3 years ago

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Dina has a mass of 50 kilograms and is waiting at the top of a ski slope that’s 5.0 meters high.

Over [174]

All of Dina's potential energy Ep is converted into kinetic energy Ek so Ep=Ek, where Ep=m*g*h and Ek=(1/2)*m*v². m is the mass of Dina, h is the height of ski slope, g=9.8 m/s² and v is the maximal velocity.

So we solve for v:

m*g*h=(1/2)*m*v², masses cancel out,

g*h=(1/2)*v², we multiply by 2,

2*g*h=v² and take the square root to get v

√(2*g*h)=v, we plug in the numbers and get:

v=9.9 m/s.

So Dina's maximum velocity on the bottom of the ski slope is v=9.9 m/s.

8 0

3 years ago

Read 2 more answers