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3 years ago

Who served as an interpreter for Lewis and Clark during their trip out west?

Physics

2 answers:

AysviL [449]3 years ago

8 0

Sacagawea served as a interpreter

iogann1982 [59]3 years ago

7 0

Answer:Sacagawea

Explanation:

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Electricity does not commonly occur in nature except in the form of ( hydrocarbons, photosyntheis, lightning, thunder)

horrorfan [7]

Hydrocarbons are compounds of hydrogen and carbon.
Photosynthesis is a process of nutrition in plants.
Thunder is a sound.
Lightning and electric eels are electrical phenomena in nature.

7 0

3 years ago

Read 2 more answers

A simple circuit consists of a light bulb connected to the terminals of a battery. A voltmeter shows a potential difference of 1

larisa [96]

<h2>Answer:</h2>

38.14Ω

<h2>Explanation:</h2>

Let's solve this question using Ohm's law which states that the current (I) flowing through a conductor is directly proportional to the potential difference or voltage (V) across it. Mathematically;

V = I R -------------------(i)

Where;

R is the constant of proportionality called resistance of the conductor and is measured in Ohms (Ω)

From the question;

V = 18.5V

I = 0.485A

Substitute these values into equation (i) as follows;

18.5 = 0.485 x R

Solve for R;

R = 18.5 / 0.485

R = 38.14Ω

Therefore the resistance of the bulb is 38.14Ω

6 0

2 years ago

An older camera has a lens with a focal length of 60mm and uses 34-mm-wide film to record its images. Using this camera, a photo

lesya692 [45]

Answer:

24.71 mm

Explanation:

Distance is proportional to focal length, so

d∝f

which means

$\frac{d'_1}{d'_2}=\frac{f_1}{f_2}$

Magnification of first lens

$M_2=-\frac{d'_1}{d_1}$

and

$M_2=\frac{h'_1}{h_1}$

Similarly, magnification of second lens

$M_2=-\frac{d'_2}{d_1}$

and

$M_2=\frac{h'_2}{h_1}$

From the above equations we get

$\frac{M_1}{M_2}=\frac{d'_1}{d_2'}$

and

$\frac{M_1}{M_2}=\frac{h'_1}{h_2'}$

which means,

$\frac{d'_1}{d_2'}=\frac{h'_1}{h_2'}$

and

$\frac{d'_1}{d_2'}=\frac{f_1}{f_2}$

So, we get

$\frac{f_1}{f_2}=\frac{h'_1}{h_2'}\\\Rightarrow f_2=f_1\times\frac{h_2'}{h'_1}\\\Rightarrow f_2=60\times\frac{14}{34}=24.71\ mm$

∴ Focal length should this camera's lens is 24.71 mm

6 0

3 years ago

Quadrupling the power output from a speaker emitting a single frequency will result in what increase in loudness (in units of dB

Leviafan [203]

Answer:

6.02 dB increase

Explanation:

Let us take the initial power from the speaker P' = P Watt

then, the final power P = 4P Watt

for a given unit area, initial intensity (power per unit area) will be

I' = P Watt/m^2

and the final quadrupled sound will produce a sound intensity of

I = 4P Watt/m^2

Increase in loudness is gotten from the relation

ΔL = $10log_{10} \frac{I}{I'}$

where

I = final sound intensity

I' = initial sound intensity

imputing values of the intensity into the equation, we have

==> $10log_{10} \frac{4P}{P}$ = $10log_{10} 4$ = 6.02 dB increase

6 0

2 years ago

What is non-point source pollution and why is this kind of pollution hard to monitor and control?

avanturin [10]

Answer:

When the source of pollution is widely distributive in nature, it is called as the Non-point source pollution, for example, acid rain.

Explanation:

the source of pollution when is not concentrated over a particular area or any particular defined pinpoint is termed to be as the Non - point source pollution.

this type of pollution is very hard to be monitored or controlled due to its nature of widely distributive nature of the origin. It has several pathways for the effect to undertake and thus the control over the effect is not easily accessible.

For example, during rain, the tree fall off can enter water stream from any source, either be it open lake or ponds or even street fall offs.

7 0

3 years ago