Answer:
The answer is below
Explanation:
A diver works in the sea on a day when the atmospheric pressure is 101 kPa. The diver uses compressed air to breathe under water. 1700 litres of air from the atmosphere is compressed into a 12-litre gas cylinder. The compressed air quickly cools to its original temperature. Calculate the pressure of the air in the cylinder.
Solution:
Boyles law states that the volume of a given gas is inversely proportional to the pressure exerted by the gas, provided that the temperature is constant.
That is:
P ∝ 1/V; PV = constant
P₁V₁ = P₂V₂
Given that P₁ = initial pressure = 101 kPa, V₁ = initial volume = 1700 L, P₂ = cylinder pressure, V₂ = cylinder volume = 12 L. Hence:
P₁V₁ = P₂V₂
100 kPa * 1700 L = P₂ * 12 L
P₂ = (100 kPa * 1700 L) / 12 L
P₂ = 14308 kPa
Một sóng cơ học có tần số 50hz lan truyền dọc theo một sợi dây rất dài biết rằng sau 5 giây sóng truyền được 1 đoạn 25m dọc theo sợi dây. Bước sóng đó bằng
Answer:
10 cm
Explanation:
Được
Tần số = 50 hertz
Khoảng cách đã đi = 25 m
Thời gian đi quãng đường 25 m = 5 giây
Tốc độ của sóng = 25/5 = 5 mét trên giây
Như chúng ta biết
Bước sóng = Vận tốc / tần số
Bước sóng = 5 mét trên giây / 50 trên giây
Bước sóng = 0,1 m = 10 cm
Identify which of the following quantities can be described fully by its magnitude.
A. acceleration
B. velocity
C. force
D. displacement
E. energy
Answer:
Energy
Explanation:
Which of the following describes the image formed by a plane mirror?
virtual and erect
real and inverted
real and erect
virtual and inverted
Answer:
Virtual and erect.
Which option best describes the increase in pressure when the volume of a plastic bottle decreases?
by a factor of 10
uneven
uniform
not at all
Answer:
B) uniform
Explanation:
We can solve this problem by using Boyle's law, which states that:
For a constant mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume.
Mathematically:
where
p is the pressure of the gas
V is its volume
If we apply the equation to the bottle in the problem, we see that:
- when the volume of the bottle (and therefore, of the gas inside) decreases, than the pressure will increase
- viceversa, when the volume of the bottle increases, the pressure will decrease
The amount by which the pressure increases is inversely proportional to the decrease in volume, so the answer depends on how the volume of the bottle decreases: however, if the volume of the bottle decreases uniformly, then we can say that the pressure inside the bottle will also increases uniformly.
MARK THIS ANSWER AS THE BRAINLIEST PLEASE ❤️
An increase in pressure of a plastic bottle uniformly decreases by a factor of ten when the volume decreases.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Pressure and volume of gas are inversely proportional.
Learn more about pressure,here:
https://brainly.com/question/14760196
#SPJ6
A car is traveling at 30 m/s and about to impact a wall. What change would result in the safest outcome
Answer:
Hitting the brakes
I guess....
Answer:
if he hits the brakes before it hits the wall then the safest outcome will be that he and his car will be safe.
Two speakers create identical 288 Hz sound waves. A person is 1.47 m from Speaker 1. What is the minimum distance to Speaker 2 for there to be constructive interference at that spot?
Answer:
2.90 meters
Explanation:
Distance of speaker 2 =?
Distance of speaker 1 = 1.47m
Velocity = 343
f = 240Hz
For constructive interference to occur:
Difference in distance or path = wavelength
For minimum distance, n = 1
Distance 2 - distance 1 = nλ
Recall λ = v/f
V = Velocity ; f = frequency
Distance 2 - distance 1 = v/f
Distance 2 - 1.47 = (343/240)
Distance 2 = 1.429 + 1.47
Distance 2 = 2.899 meters
Minimum Distance of speaker 2 for their to be constructive interference = 2.90meters
Answer: 0.280
Explanation: trust.
Help please!-
A stereo speaker has a resistance of 8I© and has a power draw of 32W. How much current is going through the speaker?
Answer:
Current = 2 Amperes
Explanation:
Given the following data;
Resistance = 8 Ohms
Power = 32 W
To find the amount of current going through the speaker;
Mathematically, power can be calculated using the formula;
Power = current² * resistance
Substituting into the formula, we have;
32 = current² * 8
Current² = 32/8
Current² = 4
Taking the square root of both sides, we have;
Current = √4
Current = 2 Amperes
An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, the current through the resistor is
Answer:
halved.
Explanation:
Given the following data;
Potential difference = constant
Resistance = 2 * resistance = 2R
To find the current I;
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
Making current (I) the subject of formula, we have;
[tex] I = \frac {V}{R} [/tex]
Substituting into the formula, we have;
[tex] I = \frac {V}{2R} [/tex]
[tex] I = \frac {1}{2} * \frac {V}{R} [/tex]
[tex] I = \frac {1}{2} * I [/tex]
Therefore, if the resistance of the resistor is doubled, the current through the resistor is halved.
What is the mass of a ball rolling at 5.00m/s if it has 3.00J of kinetic energy?
Answer:
Explanation:
The equation for Kinetic Energy is
[tex]KE=\frac{1}{2}mv^2[/tex] and we know everything but the mass of this ball. Filling in:
[tex]3.00=\frac{1}{2}m(5.00)^2[/tex]. Get everything isolated from the :
[tex]m=\frac{2(3.00)}{(5.00)^2}[/tex] which tells us that we need 3 significant digits in our answer.
m = .240 kg since mass is always in kg i the velocity is in meters/sec
calculate the mass of air in a room if the floor dimensions are 10m × 12m and height is 400 cm the density of air is 1 .26 kg/M³ 3
Explanation:
first find the volume of room --->
[tex]v \: = 10 \times 12 \times (400 \times {10}^{ - 2} ) \times = 480 \: {m}^{3} [/tex]
then find the mass
[tex]mass \: = \: density \: \times \: volume \: = 480 \times 1.26 = 604.8 \: kg[/tex]
3. What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
Explanation:
everything can be found in the picture
An engine has an imput of 100 j and gives out 27 j of useful kenetic energy what is the efficiency of the engine
Answer:
Based on what we have learned so far, in what ways have the experiences of Asian-Canadians stayed the same over time? Why do you think these similarities exist? Please give specific examples to support your ideas.
Explanation:
A metal wire breaks when its tension reaches 100 newton. If the radius and length of the wire were both doubled then it would break when the tension reached how many newtons
Answer:
200 N
Explanation:
Since Young's modulus for the metal, E = σ/ε where σ = stress = F/A where F = force on metal and A = cross-sectional area, and ε = strain = e/L where e = extension of metal = change in length and L = length of metal wire.
So, E = σ/ε = FL/eA
Now, since at break extension = e.
So making e subject of the formula, we have
e = FL/EA = FL/Eπr² where r = radius of metal wire
Now, when the radius and length are doubled, we have our extension as e' = F'L'/Eπr'² where F' = new force on metal wire, L' = new length = 2L and r' = new radius = 2r
So, e' = F'(2L)/Eπ(2r)²
e' = 2F'L/4Eπr²
e' = F'L/2Eπr²
Since at breakage, both extensions are the same, e = e'
So, FL/Eπr² = F'L/2Eπr²
F = F'/2
F' = 2F
Since F = 100 N,
F' = 2 × 100 N = 200 N
So, If the radius and length of the wire were both doubled then it would break when the tension reached 200 Newtons.
How much power is required to light a lightbulb at 100V of voltage when the lightbulb has a resistance of 500 Ohms?
Answer:
Power = 20 Watts
Explanation:
Given the following data;
Voltage = 100 V
Resistance = 500 Ohms
To find the power that is required to light a lightbulb;
Mathematically, power can be calculated using the formula;
[tex] Power = \frac {Voltage^{2}}{resistance} [/tex]
Substituting into the formula, we have;
[tex] Power = \frac {100^{2}}{500} [/tex]
[tex] Power = \frac {10000}{500} [/tex]
Power = 20 Watts
The moon orbits the earth once every 27 days at a distance of 384400 km. The international space station orbits the earth at an altitude of 400km. Determine the period of orbit of the space station
Answer:
ive never done this befor but i think its 36 times aroud earth a day
Explanation:
384400/400=961
961% of 27 days is 40minuets
1440/40=36
A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, what is the least mirror area needed ?
Answer:
mark as the brainly olss
How fast is a lightning flash?
Answer:
A lightning flash is at least 270,000 mph (434,523 kph)!
Explanation:
Have a great summer :)
Answer:
670,000,000 mph
Explanation:
The speed of lightning. While the flashes we see as a result of a lightning strike travel at the speed of light (670,000,000 mph) an actual lightning strike travels at a comparatively gentle 270,000 mph
the energy of a water wave is most closely related to its
i believe the awnser is Amplitude
What are action and reaction forces, and how do they impact an object's motion?
Action-reaction forces are equal and opposite forces that act on different objects, so they don't cancel out. In fact, they often result in motion. Think about Jerod again. He applies force with his foot to the ground, whereas the ground applies force to Jerod and the skateboard, causing them to move forward.
Hope this helps =)
how large a band of frequencies does each television broadcasting channel get ?
Answer:
Since the waves must carry a great deal of visual as well as audio information, each channel requires a larger range of frequencies than simple radio transmission. TV channels utilize frequencies in the range of 54 to 88 MHz and 174 to 222 MHz. (The entire FM radio band lies between channels 88 MHz and 174 MHz.)
Answer:
Since the waves must carry a great deal of visual as well as audio information, each channel requires a larger range of frequencies than simple radio transmission. TV channels utilize frequencies in the range of 54 to 88 MHz and 174 to 222 MHz. (The entire FM radio band lies between channels 88 MHz and 174 MHz.)
Explanation:
Ok
A car is moving eastward and speeding up. The momentum of the car is ______.
a. increasing
b. decreasing
c. remaining constant
what we have to do ? please someone help
Cuáles son los juegos tradicionales de sonora
Answer:
soccer, football, volleyball, baseball, locress
Explanation:
hope it helps
Justify that the given graph is a distance-time graph of an object at rest. (1)
2. Suppose you are going for a trip and you boarded a bus. The bus driver asked you to wear safety
belts. Will you agree with the driver and wear safety belts? Justify your answer in the light of
Newton's first law of motion. (2)
3. An object moving with a velocity of 36 km/hr changes its velocity to 72 km/hr in 20 seconds.
Find the distance travelled by the object during this time interval using only one equation of
motion
Answer:
Explanation:
Yes i will agree with the driver and wear safety belts because according to the newtons first law of motion it states that " every body continues to be in its state of rest or uniform motion in a straight line unless it is compledd by some external effort to change that state".So according to this if a bus moves our body also moves beacuse effort is applied when in the moving bus.
acceleration=final velocity - initial velocity/time taken
=(20-10 )/20
=10/20
=0.5 m/s
37. A baseball is pitched at a speed of 40 m/s. How long does it take the ball to travel 27
meters from the pitcher's mound to home plate?
Answer:
0.675
Explanation:
hope you get it right
Answer:
[tex]0.675\:\mathrm{s}[/tex]
Explanation:
Displacement can be given as [tex]\Delta x=v_x\cdot t[/tex]
Substituting given values, we have:
[tex]27=40t,\\t=\frac{27}{40}=\boxed{0.675\:\mathrm{s}}[/tex]
NO LINKS AND PLEASE ANSWER ASAP!!
of Newton's three laws of motion specifically applies in each of the
following situations:
a. Newtonj 3d Low You feel a force against the sole of your foot as you
take a step forward.
b.
A meteor moving in a straight path changes direction
when it flies by Earth.
C.
A full grocery cart that is pushed starts moving and
increases speed, but the same push increases its speed even more when the
cart is empty.
d.
A skateboard moves faster in the same direction it is
pushed.
Answer:
Its b because the meteor moving strait.
Explanation:
1) Complète les phrases suivantes en remplaçant
chaque numéro par le mot convenable:
• Pour l'oeil 1, l'image est formée en avant de la
rétine, car l'oeil est trop long.
• Pour l'oeil 2, l'image est formée derrière la
rétine, car l'oeil est plus court.
2) Trouve la place de la lentille convergente, ainsi
que les 2 foyers principaux (F) et (F').
Answer:
si?
Explanation:
definition La myopie. L'oeil myope est trop long ou le cristallin trop convergent. L'image d'un objet à l'infini se forme en avant de la rétine. Le punctum remotum est ... i dont know sorry
Una viga de acero tiene 5 m de largo a una temperatura de 20 c en un dia caluroso, la temperatura se eleva a 40 c ¿cual es el cambio en la longitud de la viga debido a la expansión térmica?
Answer:
ΔL = 1.2 10⁻³ m
Explanation:
The expression for thermal expansion is
ΔL = α L₀ ΔT
in this case it indicates that the length is L₀ = 5 m for T₀ = 20C the final temperature is T_f = 40 C
the table shows the value of thermal expansion for steel α = 12 10⁻⁶ C⁻¹
let's calculate
ΔL = 12 10⁻⁶ 5 (40 -20)
ΔL = 1.2 10⁻³ m
explain how a roller coaster functions using gravity and momentum. Why does it not need an engine or a motor to speed it up and slow it down?
Answer:
because it will help it go and funcion more
Explanation:
Answer:
It uses graivity and momentum because since we all know, gravity pulls things down, they have a chaint hat lifts the carts up, and then when it gets to a top, it releases it. When it goes down very high, it will go faster. Then it uses momentum when it goes up, then down again, or a loop to regain speed. IT doesn't need a engine or a motor to speed it up or slow it down because gravity and momentum is already doing the job a engine could. Like I said, when it is high in the sky and released, it goes down in incredible speed. And when it needs more speed to keep the ride going, it can add a loop or tight turns to increase it more.
What would the overall resistance be in a series circuit if there's an unknown R, 3Ω,3Ω and a current of 2A?
Answer:
R + 6 ohms
Explanation:
The current is the same in all three resistors
i = 2 amps
The problem is that the total voltage is unknown.
R = r
R1 =3 ohms
R2 = 3 ohms
The voltage drop is E = I*R
I = 2 amps
R1 = 3 ohms
R1 = 3 ohms
E = 3*2 = 6 volts
The second 3 ohm resistor also has 6 volts across it.
The total is 12 volts so far. But we know nothing more on how to solve for R.
All you can say is that the total resistance = R + 6 ohms