2 years ago

What do chemical symbols and formulas represent, respectively? elements and compounds compounds and mixtures atoms and mixtures

Physics

1 answer:

r-ruslan [8.4K]2 years ago

8 0

Answer:

They represent compounds and mixtures

Explanation:

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The automobile has a weight of 2700 lb and is traveling forward at 4 ft>s when it crashes into the wall. If the impact occurs

alex41 [277]

Answer:

$F_b=153918\, lb.ft.s^{-2}$

Explanation:

Given:

mass, $m=2700 \,lb$

time, $t=0.06\,s$

velocity, $v=4\,ft.s^{-1}$

coefficient of kinetic friction between wheels & pavement, $\mu=0.3$

According to first condition,

$F\times \Delta t=m\times v$

$F\times 0.06= 2700\times 4$

$F=180000\,lb.ft.s^{-2}$

According to second condition,

<u>Magnitude of frictional force (which acts opposite to the direction of motion):</u>

$f=\mu.N$

where N is the normal reaction.

$f=0.3\times 2700\times 32.2$

$f=26082 \,lb.ft.s^{-2}$

Now, the impulsive force on the wall if the brakes were applied during the crash:

$F_b= F-f$

$F_b=180000-26082$

$F_b=153918\, lb.ft.s^{-2}$

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3 years ago

If the Greek got Zeus is the ruler of the universe will we ever see him

pav-90 [236]

Answer:

Explanation:

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3 years ago

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Which of the following statements about geothermal energy is not true?

Greeley [361]

Answer:

The answer is C

Explanation:

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4 years ago

A huge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. The uppe

TiliK225 [7]

Answer:

$E = 6.77 *10^{3} N/C$

Explanation:

THE GIVEN sheet can be taken as two horizontal force with surface charge density is

at one surface is ∈_1 = $95*10^ {-9} C/mm2$

at oher surface is ∈_2= $-25*10^{-9} C/mm2$

the magnitude of electric field due to surface charge is given as $\frac{∈}{2∈_O}$

So, electric field at P (2 CM below from surface is) = E_1 +E_2

$E = \frac{∈_1}{2∈_O} +\frac{∈_2}{2∈_O}$

$E = \frac{95*10^{-9} +25*10^{-9}}{2*8.85*10^{-12}}$

$E = 6.77 *10^{3} N/C$

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4 years ago

Suggest a situation where we can obtain more than one shadow of an object at a time?

Murljashka [212]

Answer:

We can obtain more than one shadow of an object if light from more than one source falls on it. [For example during a match being played in a stadium multiple shadows of players are seen].

Explanation:

nah-

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3 years ago