Difference in air pressure helps us by contraction and relaxation of lungs which forces air in and out of the lungs.
What is pressure?The pressure is the amount of force applied per unit area. It is represented as
Pressure p = Force/Area
The atmospheric pressure is constant. The flow of air is determined by how much above or below atmospheric pressure. The pressure inside the lungs rises or falls. The diaphragm in the lung contracts and relaxes which forces air in and out of the lungs.
Hence, the person uses diaphragm of lungs to breathe.
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A well is being dug. A 4.5-kg bucket is filled with 28.0 kg of dirt and pulled vertically upward at a constant speed through a distance of 9.0 m. Determine the work done on the filled bucket in raising out of the hole.
The work done on the filled bucket in raising out of the hole is 2, 925 Joules
How to determine the work doneUsing 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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A student hears a police siren. What would change the frequency that the student hears? check all that apply
Considering the Doppler efect, the frequency heard by the student would change if:
if the student walked toward the police car.if the student walked away from the police car.if the police car moved toward the student.if the police car moved away from the student.Doppler effectThe 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:
f', f: Frequency perceived by the receiver and frequency emitted by the transmitter, respectively. Its unit of measurement in the International System (S.I.) is the hertz (Hz), which is the inverse unit of the second (1 Hz = 1 s⁻¹)v: Wave propagation speed in the medium. It is constant and depends on the characteristics of the medium. In this case, the speed of sound in air is considered to be 343 m/s.vR, vE: Receiver and transmitter speed respectively. Its unit of measure in the S.I. is the m/s±, ∓:We will use the + sign:In the numerator if the receiver approaches the senderIn the denominator if the sender moves away from the receiverWe will use the - sign:In the numerator if the receiver moves away from the senderIn the denominator if the sender approaches the receiverIn 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.
Changes on the frequencyIn this case, considering the Doppler effect, the frequency heard by the student would change if:
if the student walked toward the police car.if the student walked away from the police car.if the police car moved toward the student.if the police car moved away from the student.Learn more about Doppler effect:
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Which particle would have the longest de broglie wavelength traveling with the same velocity?.
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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pls the explanation of archimedes principle
Explanation:
Hello !
Archimedes' principle''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.
what is the difference between an sa and an sb galaxy? (select all that apply.)
The difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
What is sa Galaxy?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.
What is sb Galaxy?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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calculate the heat energy required to increase the temperature of 10 kg of water from 25 degrees Celsius to 115 degrees Celsius
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
Circle the letters of the places where portions of Earths fresh water are located
A. In streams B. In the atmosphere
C. In the oceans D. In lakes
Choose more than one
The portions of Earth's fresh water are located in lakes and streams. The options A and D are correct.
What is freshwater?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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What's the difference between the speed and velocity of an object?
question 1 options:
speed refers to the distance an object travels over time, whereas velocity represents the speed only at a given moment.
speed refers to the distance the object travels only, whereas velocity accounts for the acceleration of the object.
speed refers to the distance an object travels per unit of time only, whereas velocity also indicates the direction of travel.
speed accounts for the distance traveled and the direction, whereas velocity considers only the distance traveled per unit of time.
Answer:
C
Explanation:
velocity is a vector unit, meaning it isn't scalar so also gives direction, same as distance vs. displacement.
View the graph of sun hours in a city.
Average Monthly Sun Hours in Addis Ababa, Ethiopia
300 hrs
150 hrs
0 hrs
Jan
Feb
Mar Apr May
Jul Aug Sep
Oct Nov
Dec
Jun
Month
It can be predicted that in the following year, this city can expect the hours of sunshine to significantly increase after
which month?
January
May
July
September
It can be expected in this city that the hours of sunshine will significantly increase after the month of July
What is the trend in the hours of monthly sunshine in Addis Ababa?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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a baseball traveling at 20 m/s strikes a player running at 5 m/s. the relative speed of the ball with respect to the player depends on the direction of travel of the ball relative to the player's direction of travel. what is the difference between the minimum and maximum possible speeds of the ball relative to the player
The difference between minimum and maximum possible speeds of the ball relative to the player is 10 m/s.
What is relative velocity?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.
When two objects are traveling in the same direction, the relative velocity of one object with respect to another is obtained by subtracting their velocities.When two objects are traveling in opposite directions, the relative velocity of one object with respect to another is obtained by adding their velocities.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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Select the correct answer.
Jack lives in a society where he has almost no political power. Governmental institutions handle all political, social, and economic affairs.
Which political system is this?
OA. totalitarianism
B. monarchism
C. democracy
D. chiefdom
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.
used to accurately measure the volume of solutions when adding a solid to be dissolved
To make the solute dissolve, thoroughly mix and add a little quantity of solvent after transferring the solute to a container
What is a solute?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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A hiker travels 12 km in a direction of 50 degrees west of north. What are the north and west components of this displacement?
The north and west components of this displacement are 9.19 km and -7.71 km respectively.
North component of the displacement
The north component of the displacement is calculated as follows;
Dy = D sinθ
Dy = 12 km x sin50
Dy = 9.19 km
West component of the displacementDx = D x cosθ
Dx = - 12 km x cos(50)
Dx = -7.71 km
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A 20kg object acceleration by a force of 200N with coefficient of kineticfriction is 0.4 what is acceleration of the object?
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
a = 0.04 m s²7. Give reason: a. The motion of a bu's starting from a bus station is an example of non- uniform motion. how
Answer:
See below
Explanation:
It is a lot of stop and go....various speeds and accelerations .
A student hears a police siren. What would change the frequency that the student hears? check all that apply.
Considering the Doppler efect, the frequency heard by the student would change if:
if the student walked toward the police car.if the student walked away from the police car.if the police car moved toward the student.if the police car moved away from the student.Doppler effectThe 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.
Changes on the frequencyIn this case, considering the Doppler effect, the frequency heard by the student would change if:
if the student walked toward the police car.if the student walked away from the police car.if the police car moved toward the student.if the police car moved away from the student.Learn more about Doppler effect:
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Anyone able to help with this one? The volume of a gas sample is 550 mL and the pressure is 1.8 atm. What will the new volume of the gas be if the pressure increases to 2.2 atm? Round your answer to the correct number of significant figures.
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
A farenhights thermometer shaded from the sun to a hot day reads 101 degree what is the temperature of dry ice -80degree celcuis on the farenhights scale
Dry ice is cold, extremely cold. Ice has a surface temperature of -109.8 degrees Fahrenheit or -78.5 degrees Celsius (197.85 Kelvins).
-109.8 Fahrenheit is the sublimation temperature of dry ice on the surface where ice meets with its surrounding atmosphere(Air).on the inside it can be even colder. Due to these temperatures, its management requires extreme care.The surface temp of dry ice is much colder than the lowest temperature any average person would encounter in their lifetime. The coldest temperature ever recorded in the contiguous US is 40 degrees warmer than it. But it is also worth noting that the lowest temperature ever reliably recorded on Earth (at the Soviet Vostok Station in Antarctica) is around 20 °F below what solid CO2 is.hence, Ice has a surface temperature of -109.8 degrees Fahrenheit
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A standing wave measures 0.25 m between nodes and its frequency is 1500 hz. what is the standing wave's speed?
380 m/s
750 m/s
1500 m/s
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].
Find the energy u of the capacitor in terms of c and q by using the definition of capacitance and the formula for the energy in a capacitor
The formula for the energy in a capacitor , u in terms of q and c is q²/2c
What is the energy of a capacitor?The energy of a capacitor u = 1/2qv where
q = charge on capacitor and v = voltage across capacitor.What is the capacitance of a capacitor?Also, the capacitance of a capacitor c = q/v where
q = charge on capacitor and v = voltage across capacitor.So, v = q/c
The formula for energy of the capacitor in terms of q and 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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A coin is located 35.0 mm from the center of a turntable which accelerates from rest to a speed of 7.95 rad/s in 0.270 s. What is the minimum coefficient of friction to avoid slippage of the coin
The minimum coefficient of friction to avoid slippage of the coin is 0.23.
Minimum coefficient of friction
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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When you rub neutral objects
Answer:
Your answer is right
if anyone knows momentum can you explain it? the khan academy problems are literally killing me
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.
What 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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Which part of the curve shows:
a. acceleration
b. zero acceleration
c. deceleration
d. zero velocity
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
1. A racing car moving with constant acceleration covers two successive kilometres in 30 seconds and 50 seconds respectively. find the acceleration of the car.
2. A ball is thrown vertically upwards with a velocity of 20 metre per second from the top of a multi-storey building the height of the point from where the ball is from 25 m from the ground.
The acceleration of the car is calculated as 10 m/s.
What is acceleration?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
6. Yeast needs oxygen to create a chemical reaction in which of the following?
A. Aerobic reactions and anaerobic reactions.
B. Anaerobic reactions only.
C. Fermentation
D. Aerobic reactions only.
Answer:
D
Explanation:
Anaerobic Respiration only
a transverse wave passes through a slinky
Last one!
Perpendicular to the wave's energy
Hope this helps!
a quantity that has only magnitude(size) is
PLEASE HELP ASAP!!!
Describe the two forces that form mid-ocean ridges and ocean trenches
Ridge push refers to the pressure exerted by the excess height of the mid-ocean ridge, while Slab pull refers to the force exerted by the weight of the subducted slab on the plate it is attached to.
Two forces that form mid-ocean ridgesThe two forces that form mid-ocean ridges are ridge-push and slab pull.
What is Ridge push?Ridge push refers to the pressure exerted by the excess height of the mid-ocean ridge.
What is Slab pull?Slab pull refers to the force exerted by the weight of the subducted slab on the plate it is attached to.
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which of the following would increase
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 (✔)