does sand float on water​

Answer:

No

Explanation:

Answer:

Volleyball was invented in 1895 by William G. Morgan, physical director of the Young Men's Christian Association (YMCA) in Holyoke, Massachusetts.

Let's just suppose this situation, so it's like this;

Q --------------- q --------------- Q

Now, acc. to the question, the system is equilibrium which means that possibly both the Q should be exerting some pressure on the middle charge q, so let's suppose Q be +ve and q be -ve

The charge that we have kept at a certain distance something like this;

+Q --------------- -q --------------- +Q

<––– d ––– > <––– d ––– >

Now, we +Q will be exerting some force on the another +Q that it should be acc. to columbs law like this;

F = k × Q1Q2/r²

F = k × QQ/(2d)²

F1 = k × Q²/4d²

Also, when this +Q will exert force on -q, it could be written as;

F = k × Q1Q2/r²

F2 = k × Qq/d²

From the question, we know that the system is a equilibrium which means that these two force F1 and F2 will be equal to each other;

= k × Q²/4d² = k × Qq/d²

= Q/4 = q

= Q/4 = -q

= -Q/4 = q

So, the charge on q is -Q/4.

-------------------------------------------

Have already answered this question, but still!

Answer:

Explanation:

the answer is there, is in the graph

Answer:

6.58×10⁶ F

Explanation:

Applying,

Q = CV..................... Equation 1

Where Q = charge of the capacitor, C = Capacitance of the capacitor, V = Volatage

Make C the subject of the equation

C = Q/V................. Equation 2

From the question,

Given: Q = 7.9×10⁷ C, V = 12.0 V

Susbtitute these values into equation 2

C = 7.9×10⁷/12

C = 6.58×10⁶ F

Nuclear energy ... non-renewable.  It uses up the Uranium, and then we have to dig more Uranium out of the ground.

Water falling ... renewable kinetic energy, as soon as the sun lifts the water back up into the sky, and then it falls intk the lake again, and runs through the turbines again.

Wind turbines ... renewable kinetic energy, as soon as the sun heats the world unevenly again, and winds blow again.

Electronic signs run by solar power ... the solar power shines down on us, and will continue doing that for a few more billions of years, whether we use it or not.  So we don't use up the sun by grabbing some of that energy.

Answer:

I just took the test and its A

Explanation:

Nuclear energy heats water into steam that turns the turbines of a power plant.

Answer: rarefaction

Explanation: correct answer on a p e x

Rarefaction term describes an area of low density in a longitudinal wave.

Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a transverse in nature wave.  

In Longitudinal wave, wave carries energy and momentum with compression and rarefaction. Compression is region of high density, in this region particles of the medium is compressed. rarefaction is region of expansion and it is low density region of longitudinal wave.

Hence option C is correct.

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Answer:

Explanation:

Given the following data;

Mass of child = 23 kg

Mass of bike = 5.5 kg

Velocity = 4.5 m/s

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

[tex] Momentum = mass * velocity [/tex]

To find the momentum of each of them;

I. Momentum of the child

Momentum C = mass * velocity

Momentum C = 23 * 4.5

Momentum C = 103.5 Kgm/s

II. Momentum of the bike

Momentum B = mass * velocity

Momentum B = 5.5 * 4.5

Momentum B = 24.75 Kgm/s

Hence, we can deduce from the calculations that the momentum of the child is greater than that of the bike because of the higher mass possessed by the child.

Answer:

Explanation:

a. GPE = mgh which is mass times gravity times height. For us, this is

GPE = 260(9.8)(5.0) so

GPE = 13000 J rounded to 2 sig fig's

b. is a little bit more involved, since we are on an incline. The formula for this is usually

[tex]wsin\theta-f=ma[/tex] where f is the pull of friction on the object. But we have no friction here, so f = 0. That means that we need to find the angle of inclination using right triangle trig. We have the height as 5.0 m and we have the length of the ramp as 13 m, so we an find the angle using the inverse sin button on our calculator.

[tex]sin\theta=\frac{5.0}{13}[/tex] so

[tex]\theta=23[/tex] degrees, rounded to 2 sig fig's as needed.

The formula to find Force is F = ma, which means we need the acceleration found in the equation

[tex]wsin\theta=ma[/tex]. Filling in:

weight = 9.8(260) = 2500 N so

2500sin23 = 260a and

a = 3.8 m/sec². Now we can find force:

F = 260(3.8) so

F = 990N

c. To life the piano straight up, we just need to overcome the pull of gravity along with the mass of the piano and the angle at which it is sitting. That has a formula of

Normal force = weight = wcosθ so

Normal force = 2500cos23 and

Normal force = 2300N

Answer:

Explanation:

I'll try to answer this is clearly as possible without talking in circles. If an object is launched into projectile motion, something was behind it, pushing it forward. Once this launching was done, the launching mechanism was no longer important to the object and the object is free to keep moving forward at that same velocity forever...if that was the only thing at play here. But, because of air resistance and GRAVITY, the object is pulled down and eventually hits the ground. In other words, if there was no such thing as gravity, an object would continue to move forever in the diretion and at the speed at which it was launched.

Answer:

0.2695 N/m

Explanation:

Applying,

F = ke................. Equation 1

Where F = Force on the spring, k = spring constant, e = extension.

make k the subject of the equation

k = F/e............ Equation 2

But,

F = mg................. Equation 3

Where m = mass, g = acceleration due to gravity

Substitute equation 3 into equation 2

k = mg/e................... Equation 4

From the question,

Given: m = 55 g = 0.055 kg, e = 2 m

Constant: g = 9.8 m/s²

Substitute these values into equation 4

k = (0.055×9.8)/2

k = 0.2695 N/m

Explanation:

tan ● = opposite / adjacent

tan 31.5 = 19 / F

0.613 = 19 / F

0.613F = 19

F = 31

sin ● = opposite / hypotenuse

sin 31.5 = 19 / a

0.52 = 19 / a

0.52a = 19

a = 36. 36

Using trigonometry, the base of the triangle is approximately 33.476, and the hypotenuse of the triangle is approximately 38.118.

To find the base and hypotenuse of a right triangle with one angle of 31.5 degrees and a given height of 19:

Here,

Opposite side = height = 19 (given)

Adjacent side = base (unknown)

Hypotenuse = hypotenuse (unknown)

First, let's find the base (adjacent side):

tan(θ) = opposite ÷ adjacent

tan(31.5 degrees) = 19/base

To find the base, we can rearrange the equation:

base = opposite ÷ tan(θ)

base = 19 ÷ tan(31.5 degrees)

Calculating the value:

base ≈ 33.476

So, the base of the triangle is approximately 33.476.

Now, using the Pythagorean theorem, we can write:

hypotenuse² = base² + opposite²

hypotenuse² = (33.476)² + 19²

hypotenuse ≈ 38.118

Therefore, the hypotenuse of the triangle is approximately 38.118.

Thus, base is 33.476, and hypotenuse is 38.118.

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Answer:

The main difference between friction and viscosity is that friction is used to refer to forces that resist relative motion, in general, whereas viscosity refers specifically to resistive forces that occur between layers of a fluid when fluids attempt to flow.

Explanation:

Answer:

Viscosity

Viscosity is defined as a measure of the resistance of a fluid, which is being deformed by either shear stress or tensile stress. In more common words, viscosity is the “internal friction” of a fluid. It’s also referred as the thickness of a fluid. Viscosity is simply the friction between two layers of a fluid when the two layers move relative to each other. Sir Isaac Newton was a pioneer in fluid mechanics. He postulated that, for a Newtonian fluid, the shear stress between layers is proportional to the velocity gradient in the direction perpendicular to the layers. The proportional constant (proportionality factor) used here is the viscosity of the fluid. The viscosity is usually denoted by the Greek letter “µ”. Viscosity of a fluid can be measured using Viscometers and Rheometers. The units of viscosity are Pascal-seconds (or Nm-2s). The cgs system uses the unit “poise”, named after Jean Louis Marie Poiseuille, to measure viscosity. Viscosity of a fluid can also be measured by several experiments. The viscosity of a fluid depends on the temperature. The viscosity decreases as the temperature is increased.

τ = μ (∂u / ∂y)

Viscosity equations and models are very complex for non-Newtonian fluids. It can be clearly seen that viscosity always acts in a direction, to oppose the flow of the liquid. Viscous forces are distributed throughout the volume of the liquid in a given dynamic condition.

Friction

Friction is probably the most common resistive force we experience every day. Friction is caused by the contact of two rough surfaces. Friction has five modes; dry friction that occurs between two solid bodies, fluid friction, which is also known as viscosity, lubricated friction, where two solids are separated by a liquid layer, skin friction, which opposes a moving solid in a liquid, and internal friction that causes the internal components of a solid to make friction. However, the term “friction” is most commonly used in place of dry friction. This is caused by the rough microscopic cavities on each of the surfaces fitting each other and refusing to move. The dry friction between two surfaces depends on the friction coefficient and the reactive force normal to the plane acting on the object. The maximum static friction between two surfaces is just a bit higher than the dynamic friction.

Explanation:

PLS MARK ME BRAINLIEST

Answer:

the acceleration due to gravity, g is zero (0)

the time of the motion is 0.2 s

Explanation:

Given;

initial velocity of the student, u = 15 m/s

distance traveled by the student, x = 3 m

The motion of the student is directed towards the horizontal and the acceleration due to gravity, g is zero (0).

The time of the motion is calculated as;

x = ut + ¹/₂gt²

x = ut + ¹/₂(0)t²

x = ut

t = x/u

t = 3 / 15

t = 0.2 s

Therefore, the time of the motion is 0.2 s

Answer:

Final volume, V2 = 24.62 L

Explanation:

Given the following data;

Initial volume = 40 L

Initial pressure = 80 Pa

Final pressure = 130 Pa

To find the final volume V2, we would use Boyles' law.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

[tex] PV = K[/tex]

[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]

Substituting into the equation, we have;

[tex] 80 * 40 = 130V_{2} [/tex]

[tex] 3200 = 130V_{2} [/tex]

[tex] V_{2} = \frac {3200}{130}[/tex]

[tex] V_{2} = 24.62 [/tex]

Final volume, V2 = 24.62 Liters

Answer:

The amplitude is a measure of its change in a single period (such as time or spatial period)

what is amplitude?

A periodic variable's amplitude is a measure of its change across a single period, such as time or space. Amplitude is defined in a variety of ways, but they're all based on the size of the disparities between the variable's extreme values. The amplitude of a periodic function is sometimes referred to as the phase in older writings texts.

Answer: D) 4.91 eV

Explanation:

Answer:

no

Explanation:

it just doesn't work that way, try to search the fire pyramid on G. O. O. G. L. E. and you'll see why

Answer:

what do you mean?

Explanation:

Answer:

un arabe

Explanation:

Answer:

Explanation:

The equation for this is

f = μ[tex]F_n[/tex] where f is the frictional force the block needs to overcome, μ is the coefficient of static friction, and [tex]F_n = w=mg[/tex] (that means that the normal force is the same as the weight of the block which has an equation of weight = mass times the pull of gravity). Filling in:

1.09 = μ(.413)(9.8) and

μ = [tex]\frac{1.09}{(.413)(9.8)}[/tex] so

μ = .27

The coefficient of static friction for the given block is equal to 0.27.

Static Friction can be defined as friction that is experienced by an object when it is placed on a surface. Kinetic friction can be defined as friction due to the movement of a body on a surface. The coefficient of static friction can be described as a scalar parameter and is denoted as μs.

The coefficient of static friction can be determined from the following expression:

[tex]\displaystyle \mu_s = \frac{F}{mg}[/tex]

Where F is the applied force, m is the mass of the object and g is the gravitational acceleration.

Given, the force acting on the block  to overcome static friction = 1.09 N

The mass of the block, m = 0.413 Kg

The gravitational acceleration, g = 9.8m/s²

The coefficient of static fraction = 1.09/(0.413 ×9.8) = 0.27

Therefore, the coefficient of static friction is 0.27.

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Answer and Explanation:

They are both correct.

This is because potential energy is when there is potential for the object to have energy, while kinetic energy is energy that is moving already.

So, as the ball falls, it loses its potential energy, or "still/Stalled" energy, and gains kinetic energy, or moving energy.

#teamtrees #PAW (Plant And Water)

Answer:

Protons and Electrons

For every proton in an atomic center, somewhere, in an orbital, there will be an electron. A proton carries a positive charge (+) and an electron carries a negative charge (-), so the atoms of elements are neutral, all the positive charges canceling out all the negative charges.

Explanation:

thank me later

Answer:

i not sure

Explanation:

Answer:

1) R1 + ((R2 × R3)/(R2 + R3))

2) 0.5 A

3) 3.6 V

Explanation:

1) We can see that resistors R2 and R3 are in parallel.

Formula for sum of parallel resistors; 1/Rt = 1/R2 + 1/R3

Making Rt the subject gives;

Rt = (R2 × R3)/(R2 + R3)

Now, Resistor R1 is in series with this sum of R2 and R3. Thus;

Total resistance of circuit = R1 + ((R2 × R3)/(R2 + R3))

2) R_total = R1 + ((R2 × R3)/(R2 + R3))

We are given;

R1 = 7.2 Ω

R2 = 8 Ω

R3 = 12 Ω

R_total = 7.2 + ((8 × 12)/(8 + 12))

R_total = 7.2 + 4.8

R_total = 12 Ω

Formula for current is;

I = V/R

I = 6/12

I = 0.5 A

3) since current through the circuit is 0.5 and R1 is 7.2 Ω.

Thus, potential difference through R1 is;

V = IR = 0.5 × 7.2 = 3.6 V

Answer:

this is the answer

Explanation:

This is the solution, hope it helps

Answer:

the answer is most likely likely to be 2