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3 years ago

9

Calcium (Ca) is in the second column of the periodic table and is classified as an alkaline earth metal. Which of the following

formulas shows the ratio of a compound formed from Calcium and Bromine (Br)?A.
CaBr2

B.
CaBr

C.
CaBr3

D.
Ca2Br

1 answer:

enot [183]3 years ago

4 0

Answer:

CaI2

Explanation:

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Two objects collide and stick together. Kinetic energy

rodikova [14]

Answer:

its inertia.

Inertia is the tendency of an object to continue in the state of rest or of uniform motion

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3 years ago

PLLLZ HELP Compare and contrast electric potential energy and electric potential difference? Please use 2 content related senten

masha68 [24]

The electric potential difference is the electric potential energy per unit charge

Explanation:

First of all, we define the concept of electric potential. The electric potential is a measure of the gradient of the electric field at a certain point of the space. The electric potential at a distance $r$ from a positive charge of magnitude $q$ is given by

$V(r) = \frac{kq}{r}$

where k is the Coulomb's constant.

Now we can define the electric potential energy and the electric potential difference:

Electric potential energy is the energy possessed by a charge due to the presence of an electric field. For a charge of magnitude $q$ immersed in an electric field, its potential energy is given by $U=qV$ , where V is the electric potential at the location of the charge.
The electric potential difference is simply the difference in electric potential between two points in the space. For instance, if the potential at point A is V(A) and the potential at point B is V(B), then the potential difference is $\Delta V = V(A)-V(B)$

The electric potential energy is also defined as the work done on a charge q moved through a potential difference of $\Delta V$ . Consequently, the potential difference $\Delta V$ represents the work per unit charge done, i.e. the work done when moving a unitary charge through a potential difference $\Delta V$ .

Learn more about potential difference and current:

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#LearnwithBrainly

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4 years ago

Weight of a man is less at coal mine.Why?

dmitriy555 [2]

If someone is underground, then therefore there is less planet/ground underneath them, so there would be less gravity. Gravity directly affects weight.

5 0

3 years ago

Read 2 more answers

Fed [463]

Answer:

a) t =12[s]; b) x = 348[m]

Explanation:

We can solve this problem using the following kinematics equations:

a)

$v_{f}= v_{o}+a*t$

where:

vf = final velocity = 12 [m/s]

vo= initial velocity = 6 [m/s]

a = acceleration = 0.5[m/s^2]

t = time [s]

Now clearing the time t, we have:

$t=\frac{v_{f} -v_{o} }{a} \\t = \frac{12-6}{0.5} \\t=12[s]$

b)

We can calculate the displacement for the first 12 [s] then using the equation for the constant velocity we can calculate the other displacement for the 20[s].

$v_{f}^{2}= v_{o}^{2}+2*a*x_{1} \\therefore\\x_{1} =\frac{v_{f}^{2}-v_{o}^{2}}{2*a} \\x_{1} =\frac{12^{2}-6^{2}}{2*.5}\\x_{1} =108[m]$

The we can calculate the second displacement for the constant velocity:

$x_{2} =x_{o}+v*t_{2} \\ x_{2} =0+12*(20)\\x_{2} =240[m]$

x = x1 + x2

x = 108 + 240

x = 348[m]

5 0

4 years ago

A certain factory whistle can be heard up to a distance of 2.5 km. Assuming that the acoustic output of the whistle is uniform i

enyata [817]

Answer:

Emitted power will be equal to $7.85\times 10^{-5}watt$

Explanation:

It is given factory whistle can be heard up to a distance of R=2.5 km = 2500 m

Threshold of human hearing $I=10^{-12}W/m^2$

We have to find the emitted power

Emitted power is equal to $P=I\times A$

$P=I\times 4\pi R^2$

$P=10^{-12}\times 4\times 3.14\times 2500^2=7.85\times 10^{-5}watt$

So emitted power will be equal to $7.85\times 10^{-5}watt$

4 0

3 years ago