Which characteristics describe whether a cell contains a nucleus?.

The eiffel tower is a steel structure whose height increases by 19.5 cm when the temperature changes from −8 to +42 °c. what is

Readme [11.4K]

The coefficient of expansion is 13 * 10^-6 m per meter length.per oK
The temperature difference = 42 - - 8 = 50 oC
delta T = (42 + 273) - (-8 + 273) = 50 oK
delta L = L * 13* 10^6 m/oK
oK = 50 oK delta L = 19.5 cm = 19.5 cm [1m / 100 cm] = 0.195m
So we need to find the length and it is computed by:
0.195= L * 13 * 10^-6 * 50 L = 0.195 / (13*10^-6*50) L = 300 m

6 0

3 years ago

Two identical metal spheres a and b are connected by a plastic rod. both are initially neutral. 1.0×1012 electrons are added to

Ann [662]

The plastic rod is made of insulator (plastic), so it does not allow charges moving from one sphere to another. This means that all the electrons given to sphere A will remain on sphere A.

The number of electrons initially given to sphere A is $N=1.0 \cdot 10^{12}$ , and since the charge of 1 electron is $e=-1.6 \cdot 10^{-19} C$ , the net charge left on sphere A after the removal of the rod will be
$Q=N e = 1.0 \cdot 10^{12}(-1.6 \cdot 10^{-19} C)=-1.6.0 \cdot 10^{-7} C$

8 0

3 years ago

Read 2 more answers

A jet of water squirts out horizontally from a hole on the side of the tank as shown below. 0.579 m 1.45 m h If the hole has a d

klemol [59]

Answer:

The height of the water above the hole in the tank is 58 mm

Explanation:

In order to solve this problem we need to draw a sketch of the dimensions that include the input variables of the problem.

Where:

x = 0.579[m]

y = 1.45 [m]

Using the following kinematic equation we can find the time that takes the water to hit the ground, and then with this time, we can find the velocity of the water in the x-component.

$y = y_{o} +v_{o} *t+\frac{1}{2} *g*t^{2} \\$

It is necessary to clarify the value of each of the respective variables below

y = - 1.45 [m] "It is negative because this point is below the water outlet"

yo = 0

vo = 0 "The velocity is zero because the component of the speed on the Y-axis does not exist"

therefore:

$-1.45=0.5*(-9.81)*t^{2} \\t = \sqrt{\frac{1.45}{0.5*9.81} } \\t = 0.543[s]$

The next step is to determine the velocity in component x, knowing the time.

$v=\frac{x}{t} \\v=\frac{0.579}{.543} \\v = 1.06[m/s]$

Now using torricelli's law we can find the elevation.

$v=\sqrt{2*g*h} \\h=\frac{v^{2} }{2*g} \\h=\frac{1.06^{2} }{2*9.81} \\h= 0.057[m] = 57.95[mm]$

3 0

3 years ago

In the given figure, weight of stone inside water

AnnZ [28]

The actual weight of the stone is 11 N. It is based on the Archimedes principles.

<h3>What is Archimedes principle?</h3>

Archimedes principle states that the up thrust by water on an object is equal to the weight of water displaced.
Upthrust by water on an object= actual weight of object - weight inside water

<h3>What is the actual weight of the object, if its weight inside water is 9N and weight of water displaced is 2N?</h3>

Actual weight= weight inside water+ weight of water displaced

= 9N + 2N = 11N

Thus, we can conclude that the actual weight of the object is 11N.

Learn more about the Archimedes principle here:

brainly.com/question/775316

#SPJ1

6 0

2 years ago

Radio waves from an fm station have a frequency of 103.1 mhz. if the waves travel with a speed of 3.00 ´ 10 m/s, what is the wav

ryzh [129]

The frequency of the radio waves from the fm station is:
$f=103.1 MHz = 103.1 \cdot 10^6 Hz$
And the speed of the waves corresponds to the speed of light:
$v=3 \cdot 10^8 m/s$
Therefore, the wavelength of the radio waves can be found by using the following equation:
$\lambda= \frac{v}{f}= \frac{3 \cdot 10^8 m/s}{103.1 \cdot 10^6 Hz}=2.91 m$

3 0

3 years ago