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3 years ago

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Two small spheres with charges of 2.5 nC and the other 5.1 nC are sparated by a distance of 1.1 m. What is the electric potentia

l between the two spheres?

1 answer:

otez555 [7]3 years ago

3 0

Answer:

hello

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practice different habits. If you fail don't give up.
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hurricane camille was so strong that it broke the instruments used to determine wind speed. how were scientists able to determin

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At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power ge

Effectus [21]

Answer:

$X=3976.078202kW \approx 3976kW$

Explanation:

From the question we are told that

Wind speed $V_w=10m/s$

Turbine blade diameter $D=90m$

Air density $\tau=1.25kg/m^3$

Mechanical energy $K.E =0.05kJ/kg$

Generally the power generation potential of the wind turbine X is mathematically given as

$X=m'*K.E$

Where

$m'=\tau *\pi*D^2/4*V$

$m'=1.25 *\pi*90^2/4*10$

$m'=79521.56404kg/s \approx 79521.5kg/s$

Therefore

$X=m'*K.E$

$X=79521.56404*0.05$

$X=3976.078202kW \approx 3976kW$

$X=4.0MW$

4 0

3 years ago

Explain why the model of this chemical reaction obeys the Law of Conservation of Matter. A) because there are the same number of

Sav [38]

Answer:

(A) because there are the same number of atoms of each element shown on both sides

Explanation:

The Law of conservation of mass says that in a reaction the matter of the products should be equivalent to the matter of the reactants and the mass of the system should remain constant over time.

In a chemical reaction, while atoms bond is breaking of 1 substance than new bonds are formed in another substance and new substances are formed. However, in the overall reaction, they keep the same elements, no new elements can go and come from the outside. For example:

HCl + NaOH -----> NaCl + H2O

In this reaction, on both sides the same number of atoms of each element are present.

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3 years ago

II Force on a tennis ball. The record speed for a tennis ball that is served is 73.14 m/s. During a serve, the ball typically st

AveGali [126]

Answer:

F=248.5W N

Explanation:

Newton's 2nd Law tells us that F=ma. We will use their averages always. The average acceleration the tennis ball experimented is, by definition:

$a=\frac{\Delta x}{\Delta t}=\frac{v-v_0}{t-t_0}$

Since we start counting at 0s and the ball departs from rest, this is just $a=\frac{v}{t}$

So we can write:

$F=ma=\frac{mv}{t}=\frac{gmv}{gt}$

Where in the last step we have just multiplied and divided by g, the acceleration of gravity. This allows us to introduce the weight of the ball W since W=gm, so we have:

$F=\frac{Wv}{gt}=\frac{v}{gt}W$

Substituting our values:

$F=\frac{(73.14m/s)}{(9.81m/s^2)(30\times10^{-3}s)}W=248.5W N$

Where the average force exerted has been written it terms of the tennis ball's weight W.

8 0

3 years ago