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Explanation:

Cccccc for sure(⌐■-■)Iam a genius

The scientific statement here is option B , there are things we will never know about matter is filled with undetectable particles. This statement is describing the nature of a matter in a scientific way.

A scientific statement is a description about any phenomenon or properties of any substance in a scientific way. That may include theoretical  predictions, universally accepted things, observations etc.

Most of the scientific statements are stated based on the results of  well designed scientific investigations and are communicated through various scientific journals and articles.

Here, the statement that describes the nature of matter and its composition is an example of scientific statement. All of the other statements are not scientific.

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Answer:

The cyclist rode the first 26​-mile portion of his workout at a constant speed.

Time = distance/speed

Time taken to ride through the first portion is

26/x

For the 18​-mile cool down portion of his​ workout, he reduced his speed by 4 miles per hour. It meas that his speed during the cool down portion is (x - 4) mph. Time taken to ride through the cool down portion is

18/(x - 4)

Since each portion of the workout took the same time, it means that

26/x = 18/(x - 4)

Cross multiplying, it becomes

26(x - 4) = 18x

26x - 104 = 18x

26x - 18x = 104

8x = 104

x = 104/8

x = 13 mph

His speed during the cool down portion is

13 - 4 = 9 mph

Explanation:

not simple

Answer:

Answer:

The study of mind and behavior is known as psychology. Psychology is the scientific study of both conscious and unconscious events, as well as feelings and thoughts. It's a vast academic field that straddles the scientific and social sciences.

Answer:

The correct answer would have to be

C. Mass of the ball

genotype is the complete set of genes in an living organism

Answer:

(i) C=3Co

(ii) V=Vo/3

(iii) Decrease

Explanation:

(i) capacitance increase K times.

(ii) As charge remain constant so by using Q=CV

you will get potential decrease by K time.

(iii) Decrease due to induced electric field inside

dielectric material..

E=Eo-Eind

Explanation:

heyaaa hope it helps ☺️✌️

Answer:

c

Explanation:

pls give brainliest have a great day

TDS and ppm are common units used to measure the quantity of substance in the water, therefore the correct answer is option A.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

Common units used to measure the amount of material in water are TDS and part per million.

As given in the problem we have to find out for what measurement, the units TDS (Total dissolved solid )and ppm (parts per million) are used.

The total dissolved solid and parts per million are used to measure the amount of substance present in the water, therefore the correct answer is option A.

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Answer:

Explanation:

let's use kinematics to solve for max height above the hand.

At the top of its arc, the sword has zero vertical velocity.

v² = u² + 2as

s = (v² - u²)/2a

s = (0² - 5.0²) / (2(-9.8))

s = 1.2755...m

call it 1.3 m

to this we must adjust for the height of the hand at release which is

18.0 + 1.0 = 19.0 m above ground

19.0 + 1.3 = 20.3 m above ground

The defined friction force allows you to find which is the correct result for what type of wax you should use:

        B. One where the coefficient of static friction is larger.  

The friction force is a macroscopic force that opposes the relative movement of bodies, it is the sum of many interactions at the microscope level.

In general for solid bodies the expression of the out of friction is

             [tex]fr = \mu N[/tex]

Where fr is the friction force, μ the friction coefficient and N the normal.

The friction coefficient can be of two types:

In general, the dynamic coefficient is less than the static one.

In this case, as the temperature increases, the friction coefficient  decreases, so the skier begins to slide downwards. To prevent this sliding, he must use a wax with a higher friction coefficient.

If you only want to stand on the hill, a wax with a static coefficient must be used, while standing if you want to advance on the hill you must use a wax with a dynamic coefficient since there is a relative movement between the skier and the hill.

Let's examine the different alternatives:

A. False. The friction coefficient must be higher, so that there is more friction force.

B. True. The friction increases and can be stopped on the hill and move up the hill.

C. False In this case, you can go up the hill, but if you stop, you can go back.

D. False. The coefficient must be higher, to increase friction.

Consequently we see that the only type of wax that will allow you to stand or advance on the hill is

       B.  A wax with a higher statutory coefficient.

In conclusion, using the defined friction force we can find the correct result for what type of wax to use is:

         B. One where the coefficient of static friction is larger.

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Answer:

One where the coefficient of static friction is larger

Explanation:

The center of mass of the two objects is the average position of the parts of the two object system

The center of mass of block A, and block B  after displacement of block B is at 20 m from block A

Reason:

The given parameters are;

The position of block A and block B at t = 0 is x = 0

The mass of block A, m₁ = 8 kg

Mass of block B, m₂ = 16 kg

Speed of block A = 0 m/s

Speed of block B, v₂ = 10 m/s

Location of the center of mass of the two object at t = 3 s; Required

Solution;

The location of block A, after 3 s is x₁ = 0 (block A is at rest)

The location of block B, = v₂ × t

The location of block B, after 3 s is x₂ = 10 m/s × 3 s = 30 m

The center of mass of two masses are given as follows;

[tex]x_{cm} = \dfrac{m_1 \cdot x_1 +m_2\cdot x_2}{m_1 + m_2}[/tex]

[tex]x_{cm} = \dfrac{8 \times0 + 16 \times 30}{8 + 16} = 20[/tex]

The center of mass of the two objects is at at the position x = 20 m (from block A)

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Answer:

[tex]\huge\boxed{\sf Average\ speed = 16\ km/hr}[/tex]

Explanation:

Given:

Distance = S = 8 km

Time = t = 30 minutes = 30/60 = 0.5 hours

Required:

Average Speed = ?

Formula:

Average speed = total distance covered / total time taken

Solution:

Average Speed = 8 / 0.5

Average speed = 16 km/hr

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Harry cycles 8 kilometers in 30 minutes and the Harry's average speed obtained is 6 kilometers per hour.

Given:

Total distance covered by the Harry= 8 kilometers

Total time is taken by the Harry= 30 minutes

Convert total time to hours, the total time taken is obtained as:

Total time (hours) = 30 minutes / 60 minutes/hour = 0.5 hours

The average speed of the Harry is given by:

Average speed = Total distance / Total time

Average speed = 8 km / 0.5 hours

Average speed = 16 km/h

Therefore, Harry's average speed is 16 kilometers per hour when Harry cycles 8 kilometers in 30 minutes.

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A solid maintains its volume and shape.

Answer:

144 joules

Explanation:

v=initial velocity+(acceleration × time)

v=0+(4×3)

v=12m/s

k.e =0.5 × mass × velocity^2

=0.5 × 2 × 12^2

=1 × 144

=144 joules

Answer:

How Do Mass and Distance Affect the Force of Gravity Between Two Objects?  

The force of gravity between two objects is determined by the mass of each object and the distance between their centers. Objects with a greater amount of mass will exert a greater degree of gravitational pull, but as the distance between two objects increases, the gravitational force between them lessens.

Explanation:

An example of the significance of distance in Newton's law is how a person's weight decreases when they are further away from the center of the Earth, such as in an orbiting space station. The gravitational force, experienced as weight, is decreased, even through the person's mass and that of the Earth remain the same.

S.A of sphere = 4πr²

r = 2m

S.A = 4π *4

S.A = 50.26m²

The surface area is 50.26m²

The surface area exists as the amount of space surrounding the outside of a three-dimensional shape.

The surface area of a solid object exists as a measure of the total area that the surface of the object settles.

The surface area of a figure (in square units) exists the number of unit squares it brings to cover the entire surface without gaps or overlaps. If a three-dimensional figure includes flat sides, the sides are named faces. The surface area exists as the total of the areas of the faces.

A radius of a circle or sphere exists in any of the line segments from its center to its perimeter, and in additional modern usage, it exists also its length.

S.A of sphere = 4πr²

r = 2m

S.A = [tex]4\pi *4[/tex]

S.A = 50.26m²

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Answer:

Area=1.5(1.5)=2.25m^2

Force of gravity=10N

\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{Force}{Area}\end{gathered}

⟼Pressure=

Area

Force

\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{10}{2.25}\end{gathered}

⟼Pressure=

2.25

10

\begin{gathered}\\ \sf\longmapsto Pressure=4.4Pa\end{gathered}

⟼Pressure=4.4Pa

Answer:

Yes it is

Explanation:

the sum moles at the left side equals the sum of moles at the right side

Answer:

Explanation:

F = ma = mΔv/Δt = 1000(27 - 0)/(7.0 - 0) = 3,857.1428...

b. F = 3.9 x 10³ N

Answer:

B

Explanation:

Answer:

Option A is correct.

Explanation:

At the temperature [tex]10^{7}K[/tex] the hydrogen atoms fuse to form helium thus a large amount of heat is produced and stars are formed.

Due to gravitational pull the particles and the molecules of gases become condense and by which it becomes hot. The process goes unless the temperature of the core becomes 10,000,000K.

At this temperature, the fusion takes place and energy is released.

Thus the star shines.

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Answer:

C.) The Distance DH = 1.5 lambda

Explanation:

This statement C.) is false, because it does not count as the 1.5 wavelength, it is less than 1 wavelength.

Answer:Distance. Time. If a car travels 400m in. 20 seconds how fast is it going? Speed = Calculate the speed: If you move 50 meters at a speed of 10  2 miles in 15 minutes.

I she is running 8 miles every 60 minutes (which is 1 hour), so she is running 8 miles per hour.

we can see that her pace is 7.5 minutes per mile.

hope this helps

Answer:

person is accelerating downwards

Explanation:

We are told that the force of the person standing on the elevator is 800 N acting downwards.

We are also told that the upward force of the elevator on the person is 600 Newtons.

This means that Upward force is lesser than downward force and thus the person is accelerating downwards

Answer:

Why is an unmagnetized iron object attracted to a magnet?

Magnets attract iron due to the influence of their magnetic field upon the iron. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well.

Explanation:

An un-magnetized iron object attracted to a magnet because each atom of iron object behaves like a complete magnate having north and south pole of equal strength.

The electron revolving around the nucleus of iron atom are equivalent to small current loop having magnetic dipole.

When a magnetic material is positioned close to a magnet, it induces a density of magnetic dipole moments known as magnetization.

The motion of electrons in atoms, or the spin of the electrons or the nuclei, is what produces a material's magnetic properties; the magnetic effect can also be created by running an electrical current through the material.

When an un-magnetized iron object attracted to a magnet; every iron atoms experiences a magnetic attraction force due to magnetic field of the magnet and the atoms try to aliened themselves in such way that they can experience optimum attraction.

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Answer:

Approximately [tex]9.9\; \rm m\cdot s^{-1}[/tex], assuming that this object started from rest, [tex]g = 9.81\; \rm m \cdot s^{-2}[/tex], and that air resistance on this object is negligible.

Explanation:

If the effect of drag on this object is negligible, the acceleration of this object would be constantly equal to [tex]g[/tex], the gravitational field strength ([tex]g \approx 9.81\; \rm m\cdot s^{-2}[/tex] near the surface of the earth.)

Since acceleration is constant, it would be possible to find the final velocity of this object using SUVAT equations.

The following SUVAT equation would apply:

[tex]v^{2} - u^{2} = 2\, a\, x[/tex].

Rearrange to find an expression for [tex]v[/tex]:

[tex]\begin{aligned}v^{2} &= 2\, a\, x + u^{2}\end{aligned}[/tex].

[tex]\begin{aligned}v &= \sqrt{2\, a\, x + u^{2}}\end{aligned}[/tex].

Substitute in the values [tex]u = 0\; \rm m\cdot s^{-1}[/tex], [tex]a = 9.81\; \rm m\cdot s^{-2}[/tex], and [tex]x = 5\; \rm m[/tex]. Evaluate the expression to find the value of [tex]v[/tex]:

[tex]\begin{aligned}v &= \sqrt{2\, a\, x + u^{2}} \\ &= \sqrt{2 \times 9.81\; \rm m\cdot s^{-2} \times 5\; \rm m} \\ &\approx 9.9\; \rm m\cdot s^{-1}\end{aligned}[/tex].

Therefore, under these assumptions, the velocity of this object would be approximately [tex]9.9\; \rm m\cdot s^{-1}[/tex] right before it hits the ground.

Answer:

Always wear a lab coat and safety goggles when performing an experiment

✓ Behavior in the lab needs to be purposeful. Exercise caution when using the hot plate, as it can cause burns.

X Ice used in this lab can melt quickly. Be sure to insulate your containers.

✓ Label your glassware and paper cups clearly and appropriately. Many chemicals appear to be the same.

✓ Check glassware, such as beakers and test tubes, for cracks and chips prior to use.

X A fume hood should be used to collect any potentially harmful vapors.

✓ Wear the right gear, such as chemically resistant gloves and oven mitts, when performing the experiment.

A, C, D, F

Answer:

sun, earth, capitol building, human, atom

Explanation:

Gravity is directly proportional to the size of an object. Therefore, the object with the most mass will have the greatest force of gravity. We know this from the equation. [tex]F = G\frac{m_1m_2}{r^2}[/tex]