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3 years ago

13

Please help me! I don't understand how salt is formed. Please tell me how salt is formed. I have to use words like neutralizatio

n reaction, pH, salt, acid, base, and water. I WILL GIVE YOU THE BRAINLIEST!

2 answers:

olga nikolaevna [1]3 years ago

8 0

Salt is made in in the water the seaweeds have slat on them of you let the seaweeds dry you can see the salt on them.

gavmur [86]3 years ago

3 0

Salt is made by the process of neutralization.
You react and acid and a base together.
You use pH paper or any pH indicator. The ph of the salt should be 7
Add water too since it’s neutral and helps in maintaining pH

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A rock weighs 110 N in air and has a volume of 0.00337 m3 . What is its apparent weight when submerged in water? The acceleratio

pickupchik [31]

Explanation:

It is given that,

Weight of the rock in air, W = 110 N

Since, W = mg

$m=\dfrac{W}{g}$

$m=\dfrac{110\ N}{9.8\ m/s^2}$

m = 11.22 kg

We need to find the apparent weight of the rock when it is submerged in water. Apparent weight is equal to the weight of liquid displaced i.e.

$M=d\times V$

d is the density of water, $d=1000\ kg/m^3$

V is the volume of rock, $V=0.00337\ m^3$

$M=1000\ kg/m^3\times 0.00337\ m^3$

M = 3.37 kg

The apparent weight in water, W = m - M

$W=7.85\ kg\times 9.8\ m/s^2$

W = 76.93 N

So, the apparent weight of the rock is 76.93 N. Hence, this is the required solution.

4 0

3 years ago

The vertical motion of mass A is defined by the relation x 5 10 sin 2t 1 15 cos 2t 1 100, where x and t are expressed in millime

nikklg [1K]

Explanation:

Given that,

The vertical motion of mass A is defined by the relation as :

$x=10\ sin2t+15\ cos2t+100$

At t = 1 s

$x=10\ sin2+15\ cos2+100$

x = 115.33 mm

(a) We know that,

Velocity, $v=\dfrac{dx}{dt}$

$v=\dfrac{d(10\ sin2t+15\ cos2t+100)}{dt}$

$v=20\ cos2t-30\ sin2t$

At t = 1 s

$v=20\ cos2-30\ sin2$

v = 18.94 mm/s

We know that,

Acceleration, $a=\dfrac{dv}{dt}$

$a=\dfrac{d(20\ cos2-30\ sin2)}{dt}$

$a=-40\ cos2t-60\ cos2t$

At t = 1 s

$v=-40\ cos2-60\ cos2$

$a=-99.93\ mm/s^2$

(b) For maximum velocity, $\dfrac{dv}{dt}=a=0$

$-40\ cos2t-60\ cos2t=0$

t = 45 seconds

For maximum acceleration, $\dfrac{da}{dt}=0$

$80\ sin2t+120\ cos2t=0$

t = 61.8 seconds

Hence, this is the required solution.

5 0

4 years ago

A certain siren radiates sound uniformly in all directions. At a distance of 17 m from the siren, the intensity level is 49 db.

AveGali [126]

Answer:

The power is $P = 2.88*10^{-4 } \ W$

Explanation:

From the question we are told that

The distance from the siren is $d = 17 \ m$

The intensity level is $\beta = 49\ dB$

The threshold of hearing is $I_0 = 1.0 *10^{-12} \ W/m^2$

Generally the intensity level is mathematically represented as

$\beta = 10dB * log [\frac{I}{I_o} ]$

Where I is the intensity at which the siren radiates the sound

substituting values

$49 = 10 * log [\frac{I}{1.0 *10^{-12}} ]$

=> $I = 7.94*10^{-8} W/m^2$

Now the amount of power the siren put out is mathematically evaluated as

$P= IA$

Where A is the area of the siren which is taken as a sphere and it is mathematically evaluated as

$A = 4 \pi d^2$

So

$P = I * 4 \pi d^2$

substituting values

$P = 7.94 *10^{-8} * 4 * 3.142 * (17)^2$

$P = 2.88*10^{-4 } \ W$

3 0

3 years ago

What is the force that acts on an object and opposes its motion called?

Alika [10]

Friction is the force that acts on an object and opposes its motion

5 0

3 years ago

The thermal conductivity of a cement is 0.168 British thermal units per foot hour degree Fahrenheit [BTU divided by (ft h Super

Sliva [168]

Answer:

thermal conductivity = 0.2906 W/m.K

Explanation:

thermal conductivity = 0.168 BTU/h.ft⁰F

1 BTU/h.ft⁰F = 1.7295772056 W/m.k

0.168 BTU/h.ft⁰F = 0.168 * 1.7295772056 W/m.k

0.168 BTU/h.ft⁰F = 0.2906 W/m.k

5 0

4 years ago