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Tresset [83]
3 years ago
11

I need help quick!! Urgent!

Physics
1 answer:
faltersainse [42]3 years ago
6 0

C.

Explanation: Because mirrors are lighter, and they are easier than lenses to make perfectly smooth.

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You can follow the flow of energy in an ecosystem by following its food _____ or _____.
timofeeve [1]
<span>You can follow the flow of energy in an ecosystem by following its food Chain or food web.

In short, Answers are:
1- Chain
2- Web

Hope this helps!</span>
7 0
4 years ago
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3.972 kilometers is the same distance as how many centimeters? (Remember to include units in your answer) ​
Helga [31]

Answer:

397200 centimeters

4 0
4 years ago
A horizontal insulating rod of length 11.8-cm and charge 19 nC is in a plane with a long straight vertical uniform line charge.
SCORPION-xisa [38]

Answer:

11.962337 × 10^-4 N

Explanation:

Given the following :

Length L = 11.8

Charge = 29nC = 29 × 10^-9 C

Linear charge density λ = 1.4 × 10^-7 C/m

Radius (r) = 2cm = 2/100 = 0.02 m

Using the relation:

E = 2kλ/r ; F =qE

F = 2kλq/L × ∫dr/r

F = 2*k*q*λ/L × (In(0.02 + L) - In(0.02))

2*k*q*λ/L = [2 × (9 * 10^9) * (29 * 10^9) * (1.4 * 10^-7)]/ 0.118] = 6193.2203 × 10^(9 - 9 - 7) = 6193.2203 × 10^-7 = 6.1932203 × 10^-4

In(0.02 + 0.118) - In(0.02) = In(0.138) - In(0.02) = 1.9315214

Hence,

(6.1932203 × 10^-4) × 1.9315214 = 11.962337 × 10^-4 N

3 0
4 years ago
An electron moves through a uniform electric field E = (2.00î + 5.40ĵ) V/m and a uniform magnetic field B = 0.400k T. Determine
EleoNora [17]

Answer:a=1.75\times 10^{21}\left ( 2\hat{i}5.08\hat{j}\right )

Explanation:

Given

Electric Field \vec{E}=2\hat{i}+5.4\hat{j}

\vec{B}=0.4\hat{k}\ T

velocity \vec{v}=8\hat{i} m/s

mass of electron m=9.1\times 10^{-31} kg

Force on a charge Particle moving in Magnetic Field

F=e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]

a=\frac{e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]}{m}

a=\frac{1.6\times 10^{-19}\left [ 2\hat{i}+5.4\hat{j}+\left ( 8\hat{i}\times 0.4\hat{k}\right )\right ]}{9.1\times 10^{-31}}  

a=1.75\times 10^{21}\left ( 2\hat{i}+5.08\hat{j}\right )\ m/s^2

7 0
3 years ago
A waiter carries a plate on top of his arm. The waiter's arm applies an upward force to the plate and holds it up. This force is
Phantasy [73]
I believe it is away from his arm since the question states his arm is applying an upwards force
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