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Citrus2011 [14]

3 years ago

7

In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?

2 answers:

klemol [59]3 years ago

7 0

I’m not very sure but I think it’s 4

Alik [6]3 years ago

3 0

The answer is the second one

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Stronauts in space need to communicate with each other by radio links because

dybincka [34]

Answer:

Because there is nothing out in space , the sound waves from one astronaut's whistling can't travel over to the other astronaut's ears.

7 0

3 years ago

Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A h

vodka [1.7K]

Answer:

Explanation:

Given

Radius of A is twice of B i.e.

$R_A=2R_B$

Also Potential of both sphere is same

$V_A=V_B$

$V=\frac{kQ}{R}$

thus

$k\frac{Q_A}{R_A}=K\frac{Q_B}{R_B}$

$\frac{Q_A}{Q_B}=\frac{R_A}{R_B}$

$\frac{Q_A}{Q_B}=\frac{2}{1}=2$

$\frac{Q_B}{Q_A}=\frac{1}{2}$

(b)Ratio of $\frac{E_B}{E_A}$

Electric Field is given by $E=\frac{kQ}{R^2}$

thus $E_A=\frac{kQ_A}{R_A^2}$ ----1

$E_B=\frac{kQ_B}{R_B^2}$ ----2

Divide 2 by 1

$\frac{E_B}{E_A}=\frac{Q_B}{R_B^2}\times \frac{R_A^2}{Q_A}$

$\frac{E_B}{E_A}=\frac{1}{2}\times 4=2$

8 0

3 years ago

NEED HELP ASAP ONLY HAVE 1 MINUTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

matrenka [14]

My guess is <u><em>Wedge & Pulley</em></u>

5 0

2 years ago

Copernicus's model of the universe differs from Ptolemy's because Copernicus believed

Aneli [31]

Answer:

That the Sun was the center of the universe.

Explanation:

Ptolemy believed in geocentrism, which means that the Earth is the center of the Universe. This was also supported by Aristotle. Copernicus on the other hand believed in a heliocentric system, which proposes that the sun is the center of the universe.

4 0

3 years ago

Read 2 more answers

A harvest mouse can detect sounds below the threshold of human hearing, as quiet as −10 dB. Suppose you are sitting in a field o

PtichkaEL [24]

Answer:

The distance from harvest mouse to the leaf is 4.74 m.

Explanation:

Given that,

Intensity = -10 dB

Distance = 1.5 m

We need to calculate the power of intensity

Using formula of power of intensity

$P=I_{0}A$

$P=I_{0}\times4\pi r^2$

Put the value into the formula

$P=1.0\times10^{-12}\times4\pi\times(1.5)^2$

$P=28.27\times10^{-12}\ W/m^2$

We need to calculate the minimum intensity level

Using formula of minimum intensity

$I=10\log_{10}(\dfrac{I}{I_{0}})$

$-10=10\log_{10}(\dfrac{I}{I_{0}})$

$\log_{10}\dfrac{I}{I_{0}}=-1$

$I=10^{-1}\times(1.0\times10^{-12})$

$I=1\times10^{-13}\ W/m$

We need to calculate the area

Using formula of intensity

$I=\dfrac{P}{A}$

$A=\dfrac{P}{I}$

Put the value into the formula

$A=\dfrac{28.27\times10^{-12}}{1\times10^{-13}}$

$A=282.7\ m^2$

We need to calculate the distance

Using formula of area

$A=4\pi r^2$

Put the value into the formula

$282.7=4\pi\times r^2$

$r^2=\dfrac{282.7}{4\pi}$

$r=\sqrt{\dfrac{282.7}{4\pi}}$

$r=4.74\ m$

Hence, The distance from harvest mouse to the leaf is 4.74 m.

6 0

2 years ago