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2 years ago

6

If you run 40 meters in 60 seconds what is your average speed

2 answers:

Vikentia [17]2 years ago

8 0

1.49 MPH (Miles Per Hour)

yKpoI14uk [10]2 years ago

3 0

To calculate average speed, divide the distance by time.
Since the distance is 40 meters in 60 seconds, the problem will be 40/60.
If you divide 40 by 60, your answer will be 0.67 when rounded to the nearest hundredth.

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When you lift an object, you add the energy of lifting to the object.<br> Tor F

PtichkaEL [24]

It's true, when we lift an object we add energy to it.

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2 years ago

A simple and common technique for accelerating electrons is shown in the figure, where there is a uniform electric field between

Sunny_sXe [5.5K]

Answer : $4.483\times 10^{15}\ m/s^2$ .

Explanation:

It is given that,

Electric field strength, $E=2.55\times 10^{4}\ N/C$

We know that,

Charge of electron, $q=1.6\times 10^{-19}\ C$

Mass of electron, $m=9.1\times 10^{-31}\ kg$

From the definition of electric field, $F=qE$ ...............(1)

According to Newton's second law, F = ma..........(2)

From equation (1) and (2)

$ma=qE$

$a=\dfrac{qE}{m}$

$a=\dfrac{1.6\times 10^{-19}\ C\times 2.55\times 10^{4}\ N/C }{9.1\times 10^{-31}\ kg}$

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or

$a=4.483\times 10^{15}\ m/s^2$

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7 0

2 years ago

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference

strojnjashka [21]

Answer:

1.7323

Explanation:

To develop this problem, it is necessary to apply the concepts related to refractive indices and Snell's law.

From the data given we have to:

$n_{air}=1$

$\theta_{liquid} = 19.38\°$

$\theta_{air}35.09\°$

Where n means the index of refraction.

We need to calculate the index of refraction of the liquid, then applying Snell's law we have:

$n_1sin\theta_1 = n_2sin\theta_2$

$n_{air}sin\theta_{air} = n_{liquid}sin\theta_{liquid}$

$n_{liquid} = \frac{n_{air}sin\theta_{air}}{sin\theta_{liquid}}$

Replacing the values we have:

$n_{liquid}=\frac{(1)sin(35.09)}{sin(19.38)}$

$n_liquid = 1.7323$

Therefore the refractive index for the liquid is 1.7323

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3 years ago

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Lina20 [59]

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2 years ago

How much force is needed to accelerate a vehicle with a mass of 1000 kg at a rate<br> of 5 m/s2?

Mashcka [7]

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1 year ago