Which explanation is based on scientific evidence?
A. Using ancient techniques, it is possible to change lead into gold.
B. Chemical data collected from rock formations can be used to
determine that Earth is billions of years old.
C. The mineral quartz has properties that help protect the body from
illness.
D. The relative positions of the Sun, Earth, and stars at the time of a
person's birth can affect his or her personality.

Answer:

D. 1×10⁻⁸ M

Explanation:

[H⁺] [OH⁻] = 10⁻¹⁴

(1×10⁻⁶) [OH⁻] = 10⁻¹⁴

[OH⁻] = 1×10⁻⁸

The concentration of hydroxyl ion will be  [tex]10^{-8}[/tex]M.

The amount of a chemical substance in a mixture is expressed by the substance's concentration.

Calculation of concentration.

Given data:

Concentration of H+ =  1 x [tex]10^{-6}[/tex] M.

It is known that,

[[tex]H^{+}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M

Now, put the value of concentration of [[tex]H^{+}[/tex]] in above equation.

[1× [tex]10^{-6}[/tex]][[tex]OH^{-}[/tex]] =  [tex]10^{-14}[/tex]M

[[tex]OH^{-}[/tex]]  =   [tex]10^{-14}[/tex] / [1× [tex]10^{-6}[/tex]]M

[[tex]OH^{-}[/tex]]  = [tex]10^{-8}[/tex]M

Therefore, the concentration of hydroxyl ion will be  [tex]10^{-8}[/tex]M.

Hence, the correct answer will be an option (D).

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Answer:

20 N up

Explanation:

Since the object on the floor is sitting still. Based on Newton's law of force. Objects must have equal reaction and force against each other for still objects. So the answer is 20 N up. Since the force are equal on both sides making the object not moving.

Answer:

76 minutes.

Explanation:

There are 60 minutes in an hour + 16 minutes= 76 minutes.

Answer:

im awesomeee

Explanation:

.

Answer:

Doubt I'll be first but imma try

Explanation:

Answer:

net force

Explanation:

The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.

Answer:

a

Explanation:

Answer:

around 98 meters per second.

Explanation:

Instantaneous velocity can be found with a equation.

Vf=Vi+At

Since it fell and had no initial velocity the equation becomes

Vf=At

The Acceleration is 9.8 m/s^2

So the velocity of it fell for ten seconds is

Vf=9.8m/s^2 * 10

Vf= 98 m/s

Answer:

its z trust me

Explanation:

trust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

B) 30 mph northwest

Explanation: Vector quantities have both direction and magnitude. In this case the direction is northwest, and magnitude is 30 mph.

The following is a vector quantity, 30 mph northwest. Option B is correct.

A vector quantity is a physical quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.

In contrast, a scalar quantity is a physical quantity that has only magnitude and no direction associated with it. Examples of scalar quantities include speed, distance, mass, temperature, and time.

Here,
A vector quantity is a physical quantity that has both magnitude and direction. In this case, the magnitude is 30 mph and the direction is northwest, which makes it a vector quantity.

Option A is a scalar quantity because it only has a magnitude, but no direction associated with it. Option C is also a vector quantity because it has both magnitude and direction, but it is not given a direction in the question. Option D is a scalar quantity because it only has a magnitude.

Thus, the following is a vector quantity, 30 mph northwest. Option B is correct.

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Answer:

power

Explanation:

google

Answer:

The acceleration of the object is 0 m/s^2.

Explanation:

To solve this problem, we must remember that acceleration is equal to the change in velocity per unit time.  Since we are given that the velocity is constant, this means it is unchanging, and the acceleration is therefore zero.

Hope this helps!

Answer:

1. Solid, liquid, gas, plasma

3. latent heat of vaporization

4. melting

6. heat

7. amount of heat transferred when 1g of a substance melts or freezes

Answer:

1. Solid, liquid, gas, plasma

2.  In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.

3. latent heat of vaporization

4. melting

5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.

6. heat

7. amount of heat transferred when 1g of a substance melts or freezes

Explanation:

Textbook online

Answer: it’s Nonpolar

Explanation:

Atoms with small differences in their electronegativities are said to form nonpolar covalent bonds.

Answer:

caden

Explanation:

Answer:

An interval is a distinct measure of time or the physical or temporal distance between two things.

Explanation:

Answer:

5 km/hr due south

Explanation:

We need to subtract the two velocities due to the fact that they are in opposite directions (one due south and the other one due north). Then, for an observer located on earth, the goose will be flying at :

20 km/hr - 15 km/hr = 5 km/hr

Answer:

Vx = 3.10 [m/s]

Vy = 11.59 [m/s]

Explanation:

To solve this problem we must decompose the velocity vector by means of the angle on the horizontal.

v = 12 [m/s]

Vx = 12*cos (75) = 3.10 [m/s]

Vy = 12*sin (75) = 11.59 [m/s]

Answer:

please give me more stars

Explanation:To win a game, a player must reach 21 points. However, if the game is tied at 20-20 (or 20-all) then you are required to win by two clear points. Unlike most sports, however, if the score becomes 29-29 (or 29-all), the player or team to score the 30th point will win the game.

Answer

:Fold mountains are often associated with continental crust. They are created at convergent plate boundaries, sometimes called continental collision zones or compression zones. Convergent plate boundaries are sites of collisions, where tectonic plates crash into each other.

Answer:

The ramps length, height, degree, and the weight of the car.

Explanation:

Answer:

I think they need the slope of the ram(degree) .

& current gravitational acceleration

& the length of the ram and also l don't think mass of the cars are not needed becoz the acceleration of the cars are given by its,

Gravitational acceleration * sin( slope).

So then use that in v^2=u^2+2as equation.

s for length

a for acceleration

v for end velocity

u for start velocity

Answer:

static friction is developed between 2 surfaces in state of rest so i think answer is c.Even though the wheel is in motion, the patch of the tire in contact with the ground is stationary relative to the ground, so it is static rather than kinetic friction.

The static friction is the hindrance to an object which is trying to move from stationary state. Among the given options, the example for static friction is pushing the box that is at rest.

The friction that occurs when people attempt to move a stationary object on a surface without actually causing any relative motion between the body and the surface.

The static frictional force is self-regulating, which means that it will always be equivalent to and opposite to the force applied. Static friction is zero for an object at rest on a flat table.

Static friction creates an equal and opposite force that keeps the book at rest when you push horizontally with a small force.The static friction force increases to match the force as you push harder.

The maximum static friction force is eventually exceeded, and the book moves. Therefore, option B is correct.

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Answer:

First Quarter

Explanation:

Answer:

reduce your risk of a heart attack.

manage your weight better.

have a lower blood cholesterol level.

lower the risk of type 2 diabetes and some cancers.

have lower blood pressure.

have stronger bones, muscles and joints and lower risk of developing osteoporosis.

Answer:

4 miles per hour

Explanation:

Your welcome

Answer:

polar-molecule

Explanation:

Answer:

Explanation:

a) Using the equation of motion

S = ut + 1/2gt²

S is the distance of fall

g is the acceleration due to gravity

t is the time taken

Given S = 12.0m, g = 9.81m/s^2, un= 0m/s

12 = 0+1/2(9.81)t²

12 = 4.905t²²²

t² = 12/4.905

t² = 2.446

t = √2.446

t = 1.56secs

b) To determine how fast is the frog falling at this point, we need to calculate the speed of the frog. Using the equaton v = u+gt

v = 0+9.81(1.56)

v = 15.34m/s

Hence the frog is falling at the rate of 15.34m/s

Answer:

200 joule

Explanation:

force= 20N

distance=10m

work= ?

we know,

work= force×distance

=20N×10m

=200Nm or joule.