hello i need help with this!!​

Answer:

D

Explanation:

Anaerobic Respiration only

Considering the Doppler efect, the frequency heard by the student would change if:

The Doppler effect is defined as the change in the apparent frequency of a wave produced by the relative motion of the source with respect to its observer. In other words, this effect is the change in the perceived frequency of any wave motion when the sender and receiver, or observer, move relative to each other.

The following expression is considered the general case of the Doppler effect:

[tex]f'=f\frac{v+-vR}{v-+vE}[/tex]

Where:

In summary, the Doppler Effect is an alteration of the observed frequency of a sound due to the movement of the source or the observer, that is, they are changes in the frequency and wavelength of a wave due to the relative movement between the wave source and the observer.

In this case, considering the Doppler effect, the frequency heard by the student would change if:

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The minimum coefficient of friction to avoid slippage of the coin is 0.23.

The minimum coefficient of friction can determined from the maximum speed of the coin.

ma = μmg

mv²/r = μmg

v²/r = μg

v² = μgr

μ = v²/(gr)

μ = (ωr)²/(gr)

μ = ω²r/g

μ = (7.95² x 0.035)/(9.8)

μ = 0.23

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Answer:

1 and 3

Explanation:

1 and 3  

Increasing coils increases strength

   COOLING the wire would increase current flow and strength of magnet

Adding an iron core will definitely increase the strength of the electromagnet

(1) Increasing the number of coils (✔)

Last one!

Perpendicular to the wave's energy

Hope this helps!

To make the solute dissolve, thoroughly mix and add a little quantity of solvent after transferring the solute to a container

A solute is a material dissolved in another substance known as a solvent in a homogeneous mixture made of two or more components.

A solute's concentration in a solution is a measure of how much of that solute is dissolved in the solvent and the amount of solvent present, such as salt. Solutes are the best cleaning agents and additives.

Add a little quantity of solvent after transferring the solute to a container ideally a volumetric flask,

Which most precisely measures the volume of the solution indicated on the flask. To make the solute dissolve, thoroughly mix.

Hence the above process should be followed to dissolve, and thoroughly mix.

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The formula for the energy in a capacitor , u in terms of q and c is q²/2c

The energy of a capacitor u = 1/2qv where

Also, the capacitance of a capacitor c = q/v where

So, v = q/c

Substituting v into u, we have

u = 1/2qv

= 1/2q(q/c)

= q²/2c

So, the formula for the energy in a capacitor , u in terms of q and c is q²/2c

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Dry ice is cold, extremely cold. Ice has a surface temperature of -109.8 degrees Fahrenheit or -78.5 degrees Celsius (197.85 Kelvins).

hence, Ice has a surface temperature of -109.8 degrees Fahrenheit

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The acceleration of the car is calculated as 10 m/s.

The acceleration is the rate of change of velocity with time. Given that;

s = ut + 1/2 at^2

Assuming that the motion started from rest, u = 0 m/s

s = 1/2 at^2

2000 = 0.5 * a * (20)^2

a = 2000/ 0.5 *  (20)^2

a = 10 m/s^2

2) The time taken to reach the maximum height is gotten from;

v=u+at

0=20+(−10)t

t=2s

Then time taken to reach the maximum height;

s = ut + 1/2 at^2

s = 20(2)+0.5(−10)(2)^2

s = 20m

The maximum height is therefore 45 m thus;

45=0+0.5(10)(t)^2

t = 3s

Total time= 3+2= 5s

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acceleration = a

1000 = u(30) + 0.5a(30)²

1000 = 30u + 450a

velocity after covering 1 km = u + 30a

1000= (u+30a) (20) + 0.5a (20)²

1000= 20u + 800a

u = 35a

putting the value of u in above equation

so, a = 2/3

2. refer to the above attachment

The north and west components of this displacement are 9.19 km and -7.71 km respectively.

The north component of the displacement is calculated as follows;

Dy = D sinθ

Dy = 12 km x sin50

Dy = 9.19 km

Dx = D x cosθ

Dx = - 12 km x cos(50)

Dx = -7.71 km

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Answer:

3 767 400 joules

Explanation:

4.186 J/g-C   is the specific heat of water

25  to 115  is 90 degrees C change

10 000 g   is 10 kg of water

10 000 * 90 * 4.186 = 3 767 400 Joules

Answer / Explanation:

acceleration is essentially increasing in velocity. [acceleration is literally velocity over time]

So, we can see acceleration on this velocity/time graph (the y-axis is representative of velocity).

Meaning that...

When we increase in velocity, that is acceleration. [A]

When we stay at the same velocity, that is zero acceleration. [B]

> (we are not increasing {acceleration} or decreasing {deceleration} in velocity/ acceleration over time)

When we decrease in velocity, that is deceleration. [C]

When we have no velocity (velocity = 0), that is zero velocity. [D]

So, this curve is already in order of A-B-C-D.

(origin/0 to A = acceleration)

(A to B = zero acceleration)

(B to C = deceleration)

(C to S = zero velocity)

hope this helps!!

Answer:

O - A : acceleration

A - B : zero acceleration

B - C : deceleration

C - S : zero velocity

Explanation:

acceleration is velocity over time, meaning that the slope of the graph is showing acceleration

Answer:

See below

Explanation:

It is a lot of stop and go....various speeds and accelerations .

The body's mass and velocity are multiplied to create momentum. It happens as a result of the force used. Kg m/s² is its unit. Measurement of mass in motion is momentum.

The body's mass and velocity are multiplied to create momentum. It happens as a result of the applied force and has the unit Kg-m/s².

Equal amounts of force and momentum are applied. More quantitative than the first rule of motion, the second law of motion is usually used to describe what happens when a force is applied.

The momentum is found as;

P =mv

Where m is the mass in kilogram

v is the velocity in m/sec

P is the momentum in the kg-m/s²

The second law of motion is more quantitative, and it is frequently used to quantify what occurs when a force is applied. The second law of Newton is discussed in depth in this article.

Force and the rate of change of momentum are equal. The force is given as the product of mass and change of velocity. The impulsive force is given by the change in momentum.

I=ΔP

Hence, the body's mass and velocity are multiplied to create momentum.

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Answer:

Given - M = 20 kg

k = 0.4

F = 200 N

To find - acceleration

Solution -

F= kMA

200 = 0.4 * 20 * acceleration

200 = 8 * a

a = 8/200

a = 0.04 m s²

Answer:

C

Explanation:

velocity is a vector unit, meaning it isn't scalar so also gives direction, same as distance vs. displacement.

Answer:

[tex]750\; {\rm m\cdot s^{-1}}[/tex].

Explanation:

The distance between two adjacent nodes of a standing wave is equal to one-half (that is, [tex](1/2)[/tex]) the wavelength of this wave.

Let [tex]\lambda[/tex] denote the wavelength of the standing wave in this question. The distance between two nodes of this wave is [tex]0.25\; {\rm m}[/tex], meaning that [tex](1/2)\, \lambda = 0.25\; {\rm m}[/tex]. Thus, [tex]\lambda = 2 \times 0.25\; {\rm m} = 0.50\; {\rm m}[/tex].

Given that [tex]f = 1500\; {\rm Hz}[/tex] is the frequency of the waves that formed this standing wave, the speed of these waves would be:

[tex]\begin{aligned}v &= \lambda\, f \\ &= 0.50\; {\rm m} \times 1500\; {\rm Hz} \\ &= 0.50\; {\rm m} \times 1500\; {\rm s^{-1}} \\ &= 750\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].

The difference between minimum and maximum possible speeds of the ball relative to the player is 10 m/s.

Relative velocity is the velocity of an object with reference to the velocity of another object.

When two objects are travelling in the same direction, the relative velocity of one object to another is obtained by subtracting their velocities.

When two objects are travelling in opposite directions, the relative velocity of one object to another is obtained by adding their velocities.

The minimum relative velocity of the ball to the player (same direction) = 20 - 5 = 15 m/s

The maximum relative velocity of the ball to the player(opposite direction) = 20 +  5 = 25 m/s

Difference between minimum and maximum relative velocity = 25 - 15 = 15 m/s

Therefore, the difference between minimum and maximum possible speeds of the ball relative to the player is 10 m/s.

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The difference between the minimum and maximum possible speeds of the ball relative to the player is 10 m/s.

What is relative velocity?

The velocity of an object with respect to the velocity of another object.

The minimum relative velocity of the ball to the player moving in the same direction= 20 - 5 = 15 m/s

The maximum relative velocity of the ball to the player moving in the opposite direction= 20 +  5 = 25 m/s

Difference between minimum and maximum relative velocity = 25 - 15 = 15 m/s

Hence, the difference between the minimum and maximum possible speeds of the ball relative to the player is 10 m/s.

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Explanation:

Hello !

''states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.''

Archimedes principle equation is given as

buoyant force = density of fluid x volume of displaced fluid x acceleration due to gravity. or

Fb=-density*gravity*volume

For example, a ship that is launched sinks into the ocean until the weight of the water it displaces is just equal to its own weight.

Answer:

Archimedes principle states that"When a body is totally or partially immersed in a liquid,it experience an upthrust which is equal to the weight of the liquid displaced"

This shows that the weight of liquid displaced when a certain object is placed in water is equal to the weight of the object.

The difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.

Sa galaxies are normal spirals that have narrow, tightly wound arms, which usually are visible because of the presence of interstellar dust and, in many cases, bright stars.

The arms of sb galaxy are more widely spread than those of the Sa variety and appear less smooth.

Thus, the difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.

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The work done on the filled bucket in raising out of the hole is 2, 925 Joules

Using the formula:

Work done = force * distance

Note that force = mass * acceleration

F = mg + ma

F = 4. 5 * 10 + 28 * 10

F = 45 + 280

F = 325 Newton

Distance = 9m

Substitute into formula

Work done = 325 * 9

Work done = 2, 925 Joules

Therefore, the work done is 2, 925 Joules

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Answer:

Your answer is right

The portions of Earth's fresh water are located in lakes and streams.  The options A and D are correct.

The freshwater is the one which does not contains any harmful chemical and saltiness.

The oceans contains salt water and the lakes and the streams have fresh water.

So, the option A and D are correct.

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Answer:A or totalitarianism

Explanation: Totalitarianism is an authoritarian form of government in which the ruling party recognizes no limitations whatsoever on its power, including in its citizens' lives or rights

Some characteristics of totalitarianism:

Rule by a single party.

Total control of the military.

Total control over means of communication (such as newspapers, propaganda, etc…)

Police control with the use of terror as a control tactic.

Control of the economy.

The particle would have the longest De Broglie wavelength traveling with the same velocity, which has lesser frequency.

What is wavelength?

The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.

Wavelength λ = c/f

where c is the speed of light in vacuum = 3*10⁸ m/s

As, the wavelength and frequency are inversely related to each other. When the wavelength is longer, the frequency will be lesser to the same value of speed of wave.

Thus, the particle with less frequency has longest De Broglie wavelength.

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It can be expected in this city that the hours of sunshine will significantly increase after the month of July

The monthly hours of sunshine in the city is the average of daily sunshine in a month.

The trend as seen on th graph shows that monthly hours of sunshine is maximum between the months of December and January. Afterwards the monthly sunshine hours decreases.

Therefore, it can be expected in this city that the hours of sunshine will significantly increase after the month of July.

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Answer:

450 ML

Explanation:

Given:

Volume of gas sample: 550 mL Pressure: 1.8 atm plus 2.2 atm

To find:

The new volume of the gas after the pressure increases to 2.2 atm.

___

steps

⇒ [tex]V_1P_1=V_2P_2[/tex]

⇒ [tex](550\text{ml})(1.8\text{atm})[/tex]

⇒ [tex]=(x)(2.2\text{atm})[/tex]

⇒ [tex]x=\frac{(550)(1.8)}{2.2}[/tex]

⇒ [tex]x=450\text{ml}[/tex]

Answer:

V₂ = 450 mL

Explanation:

Because you are dealing solely with pressure and volume, you can use Boyle's Law to find the missing value. The equation looks like this:

P₁V₁ = P₂V₂

In this formula, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You have been given values for all of the variables except for "V₂". Thus, you can substitute the given values into the equation and simplify to find the answer. The final answer should have 2 sig figs to match the given values.

P₁ = 1.8 atm                      V₁ = 550 mL

P₂ = 2.2 atm                     V₂ = ?

P₁V₁ = P₂V₂                                               <----- Boyle's Law equation

(1.8 atm)(550 mL) = (2.2 atm)V₂              <----- Plug given values in

990 = (2.2 atm)V₂                                    <----- Multiply 1.8 and 550

450 = V₂                                                  <----- Divide both sides by 2.2

Answer:

Convex mirrors produce only virtual images, and concave mirrors produce real and virtual images

Answer:

covex Miros produce different thing like micronizamm and other things

Considering the Doppler efect, the frequency heard by the student would change if:

The Doppler effect is defined as the change in the apparent frequency of a wave produced by the relative motion of the source with respect to its observer. In other words, this effect is the change in the perceived frequency of any wave motion when the sender and receiver, or observer, move relative to each other.

In summary,  there is always a change in the frequency of sound as the source of the sound moves towards or away from the observer. So, the Doppler Effect is an alteration of the observed frequency of a sound due to the movement of the source or the observer, that is, they are changes in the frequency and wavelength of a wave due to the relative movement between the wave source and the observer.

In this case, considering the Doppler effect, the frequency heard by the student would change if:

Learn more about Doppler effect:

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