Why do some substances dissolve in water, but other substances do not?

Answer:

International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine fundamental physical constants. The bureau was established by a convention signed in Paris on May 20, 1875, effective January 1876. In 1921 a modified convention was signed.

Answer:

i think the products have four hydrogen atoms and two oxygen atoms and the reactants have the same atoms in two molecules of h2o

Answer:

c

Explanation:

,....,.....,...,...,....,.....,......

Answer:

8n

Explanation

Answer:

As ambient air pressure decreases, molecules evaporating from a boiling liquid meet less resistance from air molecules and enter the air more easily. Because the vapor pressure can be reduced, the temperature needed to boil the liquid is also reduced.

Explanation:

Answer:

Less force pushes down on the liquid, making it easier for gas to escape.

Explanation:

I hope this helps and have a great day!

Answer:

All objects

Explanation: Did test

Answer:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration.

#1

[tex]\\ \sf\longmapsto Work=Force(Displacement)[/tex]

[tex]\\ \sf\longmapsto Work=900(250)[/tex]

[tex]\\ \sf\longmapsto Work=225000J[/tex]

[tex]\\ \sf\longmapsto Work=225KJ[/tex]

#2

[tex]\\ \sf\longmapsto Work=40(5000)[/tex]

[tex]\\ \sf\longmapsto Work=200000J[/tex]

[tex]\\ \sf\longmapsto Work=200KJ[/tex]

Answer:

This downward force and acceleration results in a downward displacement from the position that the object would be if there were no gravity. The force of gravity does not affect the horizontal component of motion; a projectile maintains a constant horizontal velocity since there are no horizontal forces acting upon it

Answer:

F=-kx

Explanation:

yan lang po ang alam ko

Answer:

The SI unit for activity is one decay per second and is given the name becquerel (Bq) in honor of the discoverer of radioactivity. That is, 1 Bq = 1 decay/s. Activity R is often expressed in other units, such as decays per minute or decays per year.

Answer:

It is the chain reaction process that is used in reactors and nuclear weapons to generate a large number of fissions. In a reactor, the propagation of fissions takes place in a controlled manner, in a nuclear weapon in an uncontrolled, explosive manner.

The products of nuclear fission are usually accompanied by two to three secondary, free neutrons which can be absorbed later by other fissile nuclei. These absorptions in turn lead to further fissions, then to the production of other neutrons etc ..., a process commonly called chain reaction.

Considering the change of units and rule of three, the number of tablets in the bottle is 2,000.

First of all, you know that each medicinal tablet has a mass of 250 mg, while the mass of all tablets is 0.5 kg. You can see that the measurements are in different units of measurement, so you must make a change of units so that they are in the same units.

So, knowing that 1 kg is equal to 1,000,000 mg, you can apply the following rule of three: if 1 kg is equal to 1,000,000 mg, 0.5 kg is equal to how many mg?

1 kg ⇒ 1,000,000 mg

0.5 kg ⇒ x mg

So: [tex]x=\frac{0.5 kgx1,000,000 mg}{1 kg}[/tex]

x= 500,000 mg

Then, you know that each medicinal tablet has a mass of 250 mg, while the mass of all tablets is 500,000 mg. Now that the values ​​are in the same units, to calculate the number of medicinal tablets you must apply the following rule of three: if 1 tablet has a mass of 250 mg, how many tablets have a mass of 500,000 mg?

[tex]number of medicinal tablets=\frac{500,000 mgx1 tablet}{250 mg}[/tex]

number of medicinal tablets= 2,000

Finally, the number of tablets in the bottle is 2,000.

Learn more:

-1^10

centi=10 mm and mm=1/10=10^-1 cm

Answer:

B, C, and D

Explanation:

Answer:

In a second class lever, the load is located between the effort and the fulcrum. If the load is closer to the fulcrum than the effort, then less effort will be required to move the load. If the load is closer to the effort than the fulcrum, then more effort will be required to move the load.

Explanation:

from what i learned, if its farther away from the load, its easier to lift, like a wheel barrel

Answer:

:parallel

Explanation:

Potential difference is the difference in potential energy per charge between two different points in an electric circuit. Here is a simpler explanation:

Answer:

D and object with constant velocity

Answer:

1125 N

Explanation:

Answer:

The answer is static friction. This is the friction that involves objects that do not move.

Explanation:

Friction is a force which opposes the motion of one object moving relative to another. static friction and kinetic friction are the two type of friction.

Static friction is that type of friction which keeps an object at rest. Force must be applied greater than static friction to move an object. Therefore it is the static friction which helps the pile of rocks from falling apart.

(Brainiest and thanks appreciated)

Answer:

static friction

Explanation:

I did a test like this yesterday same question different object

Answer:

45 m

Explanation:

Use the equations of motion.

We know that:

S= the unknown

U=3 m/s

V=12 m/s

A=1.5 m/s

T= we won't need it

The equation used: [tex]v^2=u^2+2as[/tex]

Subsitute the values: [tex]12^2=3^2+2*1.5*s\\[/tex]

Solve the equation:

[tex]144=9+3s[/tex]

[tex]135=3s[/tex]

[tex]s=45 m[/tex]

The velocity of the ball after it hits the bottle is 15.8 m/s

Let m₁ represent the mass of the ball, m₂ the mass of the bottle, u₁ the velocity of ball before impact, u₂ the velocity of bottle before impact, v₁ the velocity of ball after impact and v₂ the velocity of bottle after impact.

Given that:

m₁ = 0.7 kg, m₂ = 0.15 kg, u₁ = 22 m/s, u₂ = 0, v₂ = 29

momentum before impact = momentum after impact, hence:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

0.7(22) + 0.15(0) = 0.7v₁ + 0.15(29)

0.7v₁ = 11.05

v₁ = 15.8 m/s

Therefore the velocity of the ball after it hits the bottle is 15.8 m/s

Find out more at: https://brainly.com/question/20301772

The magnitude of the net force causing the 2300kg car to slow down is 6900N

HOW TO CALCULATE FORCE:

F = 2300kg × 3m/s²

F = 6900N

Learn more at: https://brainly.com/question/18109210?referrer=searchResults

Hi there!

We can begin by solving for the time it takes the projectile to reach the ground.

Use the equation:

[tex]t = \sqrt{\frac{2h}{g}}[/tex]

Plug in the given height:

[tex]t = \sqrt{\frac{2(357)}{9.8}} = 8.536 s[/tex]

Use the equation:

d = vt, to solve for the horizontal distance:

d = (54)(8.536) = 460.944 m

Answer:

1. the robber carrying the metal safe will hurt more because the metal safe is heavier, so the heavier will be the force on the opposite direction from the one he was running when he hit the wall

2. ???

Explanation:

1. 3rd newton law: "If two bodies exert forces on each other, these forces are equal in magnitude and opposite in direction"

2. I don't know

Answer:

重力

Explanation:

这是正确的答案还是不是

Answer:

honestly a bit confused by the question, but this would be a 9 meter difference in the distance, moving from 20m to 11m

Explanation:

Answer:

The units of frequency are hertz. As 1 hertz is equal to one cycle per second.

Amplitude is the maximum displacement of the waves or the distance from rest to crest and is measured in meters or centimeters or millimeters.

[tex]F=k(l_1-l_2)[/tex]

[tex]10=5k[/tex]

[tex]k=2[/tex]

[tex]15=2*(30-l_2)[/tex]

[tex]15=60-2l_2[/tex]

[tex]2l_2=45[/tex]

[tex]l_2=22,5cm[/tex]

Answer:

36 km / hr

Explanation:

velocity final = velocity initial + accel * time

                             20 m/s     + (-2)*5                ( 20 m/s = 72 km/hr)

                                10 m/s     ( or 36 km/hr)