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faust18 [17]
3 years ago
13

at Niagara Falls, if 505 kg of water fall a distance of 50.0 m, what is the increase in the internal energy of the water at the

bottom of the falls? Assume that all of the initial potential energy goes into increasing the water's internal energy and that the final kinetic energy is zero
Physics
1 answer:
anygoal [31]3 years ago
5 0

Answer:

Hope that helps

Explanation:

the increase in the internal energy of the water at the bottom of the falls

= mgh

= 505 * 9.81 * 50

= 247703 J ----answer

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This mathematical model describes the changes that occur in a sample of
Veseljchak [2.6K]

Answer:

the correct answer is B

Explanation:

The kinetic model of the movement describes that the movement of the molecules increases with the increase of their internal energy, which in a macroscopic sample is reflected in an increase in the temperature of the sample.

The sample graph shows the function of temperature over time, which is why our kinetic model establishes that there is an increase in the movement of water molecules.

Consequently the correct answer is B

8 0
3 years ago
A very long cylinder, of radius a, carries a uniform polarization P perpendicular to its axis. Find the electric field inside th
Juliette [100K]

Answer:

For electric field inside cylinder, check image 02 attached

For electric field outside cylinder, check image 03 attached

Explanation:

Let's consider the polarized cylinder as superposition of two cylinders with opposite,equal, uniform charge densities in a way shown in the figure in the "image 01"d attached ;

In general, if we have an object with polarization (P¬) , then we have to take two objects with similar shape to the system, with opposite, equal, and uniform charge densities and then we super-impose these two objects in such a way that the total dipole moment of this superimposed system is equal to the total dipole moment of original system.

Now, we can take the super- imposed system as equivalent to the original system for calculating electric field and potential.

Therefore,

For the electric field inside the cylinder, check the solution in "image 02" i attached

For the electric field outside the cylinder, check, "image 03" i attached.

4 0
3 years ago
Read 2 more answers
A hollow, conducting sphere with an outer radius of 0.250 m and an inner radius of 0.200 m has a uniform surface charge density
frez [133]

Answer: a)5.73 *10^-6 C/m^2; b)648*10· N/C c)56.5 *10^3 Nm^2/C

Explanation: Considering the definition of surface charge density as:

σ  = Q/ area of sphere

so Q = σ *  4*π* R^2outer

The new Q at the outer radius is: Q initial -0.5 microC =5 micro C

The Electric with the new outer charge is equal to:

E= k*Q / R^2outer= 9 10^9* 5 microC/(0.25m)^2= 648*10^3 N/C

Finally the flux corresponding to the internal charge is equal to

By using Gauss law, the total flux is equal to net change divided ε0

so this is 0.5 microC/ ε0= 56.5 *10^3 Nm^2/C

5 0
4 years ago
A 20 newton weight is attached to a spring, causing it to stretch, as shown in the diagram below. What is the spring constant of
Whitepunk [10]

A 20.-N force stretches the spring by 1.00 m - 0.50 m = 0.50 m, so by Hooke's law the spring constant is k such that

20. N = k (0.50 m)

⇒   k = (20. N) / (0.50 m) = 40 N/m

4 0
3 years ago
What is the acceleration of an elevator that weighs 5200 kg with a force of 35 N ?
borishaifa [10]

Answer:

<h2>0.007 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

a =  \frac{f}{m}  \\

f is the force

m is the mass

From the question we have

a =  \frac{35}{5200}  = 0.006730 \\

We have the final answer as

<h3>0.007 m/s²</h3>

Hope this helps you

7 0
3 years ago
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