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3 years ago

Mikes car can accelerate from 0 mph to 40mph in 5 seconds what is the acceeration of his car in miles per hour per second

Physics

2 answers:

Montano1993 [528]3 years ago

8 0

40/5=8. His speed increases 8mph/second :)

Marianna [84]3 years ago

3 0

Mike's car accelerates at 8 mph/mps

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A step index fiber has a numerical aperture of NA = 0.1. The refractive index of its cladding is 1.465. What is the largest core

Vladimir [108]

Answer:

diameter = 9.951 × $10^{-6}$ m

Explanation:

given data

NA = 0.1

refractive index = 1.465

wavelength = 1.3 μm

to find out

What is the largest core diameter for which the fiber remains single-mode

solution

we know that for single mode v number is

V ≤ 2.405

and v = $\frac{2*\pi *r}{ wavelength} NA$

here r is radius

so we can say

$\frac{2*\pi *r}{ wavelength} NA$ = 2.405

put here value

$\frac{2*\pi *r}{1.3*10^{-6}} 0.1$ = 2.405

solve it we get r

r = 4.975979 × $x^{-6}$ m

so diameter is = 2 × 4.975979 × $10^{-6}$ m

diameter = 9.951 × $10^{-6}$ m

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3 years ago

When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelengt

Olin [163]

Answer:

Explanation:

Formula and givens

λ = c / f
λ is the wavelength
c = the speed of light
f = the frequency
c = 3*10^8
f = 7.89 * 10^14

λ = ?

Solution

λ = 3*10^8 / 7.89*10^14

λ = 3*10^8/7.89*10^14

λ = 2.36 * 10^7

λ = 236 nanometers. What you use as your solution depends on what what you have been taught.

6 0

3 years ago

If a total 50 J of work are done on an object, it's energy...

babymother [125]

Answer:

0.0119502868 kilocalorie

Explanation:

8 0

3 years ago

Match the vocabulary terms to their definitions. 1. an indication of how close a measurement is to the correct result precision

polet [3.4K]

<u> Answers</u>

1. precision

2. density

3. control

4. matter

5. accuracy

6. gradation

<u>Explanation</u>

1. An indication of how close a measurement is to the correct result is called precision.

2. The mass of a substance per unit volume is called density of a substance.

3. A quantity in an experiment that remains unchanged or constant is called a control group.

4. Anything that has mass and occupies space is called matter.

5. The degree to which a measurement can be replicated is called accuracy.

6. Scale markings that denote equal units of measure is called gradation.

7 0

3 years ago

In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is

Alchen [17]

Answer:

(a) Electric force will be $77.285\times 10^{-9}N$

(B) Velocity $v=2.1522\times 10^6m/sec$

Explanation:

We have given that radius of the circular orbit $r=0.546\times 10^{-10}m$

Charge on electron $e=1.6\times 10^{-19}C$

(A) According to coulomb's law electric force between two charges is given by

$F=\frac{kq}{r^2}$

So electric force $F=\frac{9\times 10^9\times (1.6\times 10^{-19})^2}{(0.546\times 10^{-10})^2}=77.285\times 10^{-9}N$

We know that centripetal force is given by $F=\frac{mv^2}{r}$

So $\frac{9.11\times 10^{-31}\times v^2}{0.546\times 10^{-10}}=77.285\times 10^{-9}$

$v=2.1522\times 10^6m/sec$

8 0

3 years ago