Answers
Answer:
a) - 72.5°c
b) pressure = 3625.13 Pa
c) density = 0.063 kg/m^3
d) it is a subsonic aircraft
Explanation:
a) Determine Temperature
Temperature at 19.5 km ( 19500 m )
T = -131 + ( 0.003 * altitude in meters )
= -131 + ( 0.003 * 19500 ) = - 72.5°c
b) Determine pressure and density at 19.5 km altitude
Given :
Po (atmospheric pressure at sea level ) = 101kpa
R ( gas constant of air ) = 0.287 KJ/Kgk
T = -72.5°c ≈ 200.5 k
pressure = 3625.13 Pa
hence density = 0.063 kg/m^3
attached below is the remaining part of the solution
C) determine if the aircraft is subsonic or super sonic
Velocity ( v ) = \(\sqrt{CRT}\) = \(\sqrt{1.4*287*200.5 }\) = 283.8 m/s
hence it is a subsonic aircraft
Related Questions
What is sound waves
Answers
Sound waves are a type of mechanical wave that propagate through a medium, typically air but also other materials such as water or solids.
Characteristics of sound wavesFrequency: the frequency of a sound wave refers to the number of cycles or vibrations it completes per second and is measured in Hertz (Hz).
Amplitude: the amplitude of a sound wave refers to the maximum displacement or intensity of the wave from its equilibrium position. It represents the loudness or volume of the sound, with larger amplitudes corresponding to louder sounds and smaller amplitudes corresponding to softer sounds.
Wavelength: the wavelength of a sound wave is the distance between two consecutive points in the wave that are in phase, such as from one peak to the next or one trough to the next. It is inversely related to the frequency of the wave.
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A race car accelerates from rest with a displacement of 25.0 m. If the
acceleration is 1.2 m/s2, what is the car's final velocity?
Answers
Answer:
Vf = Vi + at
t = Vf - Vi = 0.0m/s - 1.75 m/s
--------- = ------------------------- = 8.8s
a -0.20 m/s(squared)
Explanation:
This is what I got I am pretty sure it's correct but correct me if I'm wrong : )
How are reflectivity and solubility related?
Answers
Answer:
they are related because..
Explanation:
Physical properties can be observed or measured without changing the composition of matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others
The relation is ; Reflectivity and solubility are both physical properties of substances and are measured in relation to given variable ( i.e. incident ray for reflectivity and solvent for solubility )
Reflectivity ( aka optical property ) and solubility are both physical properties of any substance. while reflectivity of an object is measured as the amount of light an object reflects in relation to the light incident on it ( incident ray ), solubility is the amount of a substance that will dissolve in a given solvent at a given temperature. a
Hence we can conclude that the relation between reflectivity and solubility is that they are both physical properties of substances and are measured in relation to given variable ( i.e. incident ray for reflectivity and solvent for solubility ).
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A book is sitting on a desk. If the surface area of the book's cover is 0.05 m², and atmospheric pressure is 100.0 kPa, what is the downward force of the atmosphere on the book
Answers
Answer:
5000N
Explanation:
Given parameters:
Area of the book cover = 0.05m²
Atmospheric pressure = 100kPa = 100 x 10³Pa
Unknown:
Downward force of the atmosphere on the book = ?
Solution:
Pressure is defined as the force per unit area on a body.
So;
Downward force = Atmospheric pressure x Area
Downward force = 100 x 10³ x 0.05 = 5000N
According to Kepler's second law at the two shaded areas above are equal then...
A. it takes the same amount of time for planet A to travel between T1 and T2 as it does to travel between T3 and T4
B. Planet A will cause an eclipse on Planet B during those time intervals
C. it takes Planet A more time to travel between T1 and T2 as it does to travel between T3 and T4
D. it takes Planet A less time to travel between T1 and T2 as it does to travel between T3 and T4
Answers
Answer:
A. Kepler's second law says that the radius vector sweeps equal areas in equal times.
the pilot of a new stealth helicopter which has a mass of 15000 kg and was traveling 180 m / s accelerated to 250 m / s in six seconds to make sure he could rescue those in need how much force was used to accelerate the helicopter and what was the helicopters final momentum
Answers
Answer:
pf = 3750000 kg.m/s
F = 175000 N
Explanation:
Constant Acceleration
An object moves with constant acceleration if its velocity changes uniformly in time.
If we call vo to the initial speed, vf the final speed, and t the time, then the acceleration is calculated as:
\(\displaystyle a=\frac{v_f-v_o}{t}\)
The new stealth helicopter was traveling at vo=180m/s and changed to vf=250 m/s in t=6 seconds, thus the acceleration was:
\(\displaystyle a=\frac{250-180}{6}\)
\(a=11.67~m/s^2\)
Please note this number is shown rounded to the nearest hundredth, but it was stored in the calculator's memory with full precision. This fact affects the next calculation as will be noted below.
The acceleration must be produced for some net force that can be calculated by:
F = m.a
Where m=15000 Kg is the mass of the helicopter. Thus:
F = 15000 * 11.67
F = 175000 N
The above product would lead to the inaccurate result of 175050 if the acceleration would have not used with its full representation in the calculator's memory.
The momentum of an object of mass m and velocity v is:
p = m. v
The final momentum of the helicopter is:
pf = m.vf = 15000*250 m/s
pf = 3750000 kg.m/s
Note: When performing calculations over intermediate results, it's important to keep them as accurate as possible to preserve the accuracy of the final result.
Compare the empirical equation from y=9.8x to V= gT + V0 to determine g and V0
Answers
Answer:
Explanation:
The empirical equation y = 9.8x represents the relationship between the displacement y of an object and the time x it has been falling under the influence of gravity.
On the other hand, the equation V = gT + V0 represents the relationship between the velocity V of an object, the time T, the initial velocity V0, and the acceleration due to gravity g.
To compare the two equations, we can equate the displacement y in the first equation with the expression for displacement in terms of velocity and time, which is y = (1/2)gt^2 + V0t, where t is the time.
Substituting this into the empirical equation, we get:
9.8x = (1/2)gt^2 + V0t
We can see that this equation has three variables: g, V0, and t. We can't determine all three variables from this equation alone.
However, if we know the time it takes for an object to fall a certain distance, we can use this equation to solve for g and V0. For example, if we know that an object falls 1 meter in 0.45 seconds, we can substitute x=1 and t=0.45 into the equation:
9.8(1) = (1/2)g(0.45)^2 + V0(0.45)
Simplifying this equation, we get:
g = 19.62 m/s^2
V0 = 0.45(9.8) = 4.41 m/s
So the acceleration due to gravity is 19.62 m/s^2 and the initial velocity is 4.41 m/s. Note that these values may not be exactly equal to the true values, as the empirical equation y=9.8x is only an approximation and there may be other factors affecting the motion of the object.
Which of the following are correct statements?Check all that apply.A.Atoms are the basic units of matter.B.The atomic number is the number of electrons an atom has.C.The number of neutrons an atom has defines what kind of element it is.D.The number of protons in an atom's nucleus defines what kind of atom it is.
Answers
Atoms are the basic units of matter. The atom is the smallest unit of matter that can't be divided using any chemical means and the building block that has unique properties. In other words, an atom of each element is different from an atom of any other element.
The number of protons in an atom's nucleus defines what kind of atom it is. The number of protons in the nucleus is the atomic number and it defines to which chemical element the atom belongs.
Thus, the correct options are (A) and (D).
A Crew Dragon capsule with a mass of 9,500 kg is reentering Earth's atmosphere. It has slowed down from orbital velocity to 2,000 m/s. Which of the following would be equal to the pull of the Earth on the capsule?
Group of answer choices
The push of air resistance on Earth
The gravitational pull of the capsule on the Earth
The gravitational pull of the sun on the capsule
The push of air resistance on the capsule
Answers
The capsule will be the push of air resistance on the capsule.
option D.
What is Newton's third law of motion?
Newton's third law of motion states that for every action force, there is an equal and opposite reaction force.
If the capsule is slowed down from orbital velocity to 2,000 m/s due to pull of the Earth on the capsule, then the capsule will exert equal and opposite force to Earth.
Thus, the opposite and equal force exerted by the capsule will be the push of air resistance on the capsule.
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How does something(the big bang) come from nothing by nothing i mean the first universe although we don't know where the first universe is but we do know that nothing can't come from something.
Answers
The Big Bang theory is the most widely accepted explanation for the origins of the universe, but it does not necessarily imply that the universe emerged from nothing.
It is possible that new discoveries or insights may shed light on this fundamental question in the future. The universe may have arisen from a pre-existing state or through some other natural process that we do not yet understand.
Instead, the theory describes how the universe underwent a rapid expansion from a very dense and hot state. The conditions and laws of physics that applied during the earliest moments of the universe may not necessarily be the same as those we observe today, and there are many unknowns and uncertainties in our understanding of these early stages.
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a leaky faucet is dripping at a rate of 1 pint per hour how many hours to fill 10 gallons
Answers
Answer:
80 hours :)))))))))))))
Determine the velocity (in m/s) of the object during the first six seconds. Include a numerical answer aceurate to the first decimal place. If negative, include the-sign.
Answers
Answer:
.66m/s
Explanation:
Using the formula V=D/T, we can take our distance, 9m, and put it over our time of 6 seconds.
A wire is attached to the ceiling so that the current flows south to north. A student is standing directly below the wire facing north. What is the direction of the B-field (caused by the current in the wire) at this observation point
Answers
Answer:
If one wraps the fingers around the wire and points the thumb in the direction of the "conventional" current the fingers will point towards the North pole - the direction of the B-field.
In this case the B-field is pointed "West".
describe how the volume of a floating object such as a cork can be found.fully describe please step by step.
Answers
Answer:
Explanation:
Use Archimedes' principle, that states something of this nature: "The buoyant force acting on an object immersed in a fluid is equal to the weight of the fluid displaced"
Say, you take a cube of wood(for example) and place it in a bucket of water. Your cube is bound to sink, until, the upthrust force equals its weight.
Where does this upthrust come from?
As the cube sinks, it displaced some volume of water(if the bucket were full you would see water pouring out)
Archimedes simply stated that: Upthrust,
U=mg
Example: One way to measure the volume of any irregular object (in your case, a stone) is to submerge it completely under water and measure the change in the height of the water level. This change in the water level (let's say it goes from 50 mL to 65 mL) indicates that the stone has a volume of 15 mL.Example:Subtract the first volume from the second volume to calculate the volume of the stone. For example, if you recorded 40 fluid ounces the first time, and 50 fluid ounces the second time, the stone volume is 10 fluid ounces.A pan of water is boiling but does not change in temperature. The energy that is needed to turn the water into a gas is called the latent ____________ ____________ ________________ What three words coplete the sentence?
Answers
The energy that is needed to turn the water into a gas is called the latent heat of vaporization.
What is latent heat of vaporization?Latent heat of vaporization is the heat capacity or energy that is needed to turn the water in liquid state into a gas without any rise or change in temperature of the water.
Mathematically, the formula for the energy that is needed to turn the water into a gas is given as;
Q = mLv
where;
Q is the energy neededm is the mass of the waterLv is the Latent heat of vaporizationThus, the three words needed to complete the sentence are heat of vaporization.
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2. A car traveling at 80 m/s speeds up to 90 m/s in 2 seconds. What is the acceleration of the car?
Answers
Answer:
\(\boxed {\boxed {\sf a= 5 \ m/s^2}}\)
Explanation:
We want to calculate the acceleration of the car. Acceleration is the change in velocity over the change in time.
\(a= \frac{ \Delta v}{\Delta t}\)
The change in velocity is the difference between the final velocity and the initial velocity.
\(a= \frac{v_f-v_i}{\Delta t}\)
The car speeds up from 80 meters per second to 90 meters per second. Therefore,
\(v_f\)= 90 m/d\(v_i\)= 80 m/s\(\Delta t\)= 2 sSubstitute these values into the formula.
\(a= \frac {90 \ m/s - 80 \ m/s}{2 \ s}\)
Solve the numerator and subtract.
\(a= \frac{10 \ m/s}{2 \ s}\)
Divide.
\(a= 5 \ m/s/s\)
\(a= 5 \ m/s^2\)
The acceleration of the car is 5 meters per second squared.
Nervous tissue is made up of neuroglia and what other type of cell?
neurons
sarcomeres
ovules
stem cells
Answers
Answer:
Neurons
Explanation:
1. Towards the end of a 400m race, Faisal and Edward are leading and are both running at 6m/s. While Faisal is 72m from the finish line Edward is 100m from the finish line. Realising this and to beat Faisal, Edward decides to accelerate uniformly at 0.2 m/s2 until the end of the race while Faisal keeps on the same constant speed. Does Edward succeed in beating Faisal?
Answers
Answer:
no
Explanation:
Faisal will finish the race in ...
(72 m)/(6 m/s) = 12 s
In order to beat Faisal, Edward's average speed in those 12 seconds must exceed ...
(100 m)/(12 s) = 8 1/3 m/s
To achieve that average speed, Edward's acceleration must be ...
(8 1/3 m/s -6 m/s)/(12 s/2) = 7/18 m/s² ≈ 0.3889 m/s²
Accelerating at only 0.2 m/s², Edward will not beat Faisal.
_____
Additional comment
When acceleration is uniform, the average speed is reached halfway through the period of acceleration.
write down the value of
920 kg in g
Answers
Answer:
920000
Explanation:
Each kg contains 1,000 grams
A Man Moved first a Distance of 1000 m in 25 second and 2.5 km in 50 second along a in straight line?
Answers
Answer:
Average speed = 46.67 m/s
Explanation:
Given that the time taken in covering first 1000 m = 25 seconds.
The time taken in covering next 2.5 km = 50 seconds.
Total distance covered = 1000 m + 2500 m = 3500 m
Total time taken = 25+50=75 seconds
Average speed = Total distance covered / total time taken
= 3500/75 = 46.67 m/s
A train changes its velocity from 70km / h to 20km / h in 6 s The distance it covered is:
a) 75.0 m
b) 9.87 m
c) 15.4 m
d) 20.6 m
Answers
The distance covered by the train will be 75 meters.
What is the equation of motion?Physics equations called equations of motion describe how a physical system acts in terms of how its motion alters over time.
The equations of motion, which are a group of mathematical functions stated in terms of dynamic variables, provide a more thorough description of how a physical system behaves.
Given that a train changes its velocity from 70km / h to 20km / h in 6 s.
Use the first equation of motion:-
V= U + at
20 = 70 + ( 1 / 600)a
-50 = ( 1 / 600)a
a = -30000
Use another equation of motion:-
V² = u² + 2as
20² = 70² + 2 ( -30000)S
400 - 4900 = -60000S
-4500 = -60000S
S = -4500 / -60000
S = 0.075 KM
S = 75 meters
Therefore, the distance covered by the train will be 75 meters.
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How to find distance with only time
Answers
Answer:The formula distance = (initial velocity * time) + (1/2 * acceleration * time^2) would help. Take the initial velocity as 0 m/s , time as 60 seconds ( convert minutes to SI units) and the acceleration as 1m/s^2. You should get 1.8 km.
Explanation:hope this helps
A record has an angular speed of
38.9 rev/min.
What is its angular speed?
Answer in units of rad/s.
pt 2
Through what angle does it rotate in 1.9 s?
Answer in units of rad
Answers
The record will rotate through an angle of 1.24°.
Angular speed of the record, ω = 38.9 rev/min = 0.65 rev/s
Time taken for the rotation, t = 1.9 s
Motion in a circular path or around the circumference of a circle is referred to as circular motion. It may rotate at a particular speed and angular rate or it may rotate at a variable rate, making it either uniform or non-uniform circular motion.
The angular speed is the rate of change of angular displacement.
Therefore, angular displacement of the record,
θ = ωt
θ = 0.65 x 1.9
θ = 1.24°
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If the frequency of a wave increases, the wavelength will
O decrease
O increase
O disappear
O remain unchanged
Answers
Answer:
the wavelength will decrease
Explanation:
If the frequency of a wave increases, the wavelength will decrease. This is because the speed of the wave is constant for a given medium, so if the frequency (the number of waves passing a fixed point per second) increases, then the distance between successive wave crests (i.e., the wavelength) must decrease to maintain a constant speed. This relationship is described by the wave equation:
v = f λ
where v is the speed of the wave, f is the frequency, and λ is the wavelength. If v is constant and f increases, then λ must decrease to keep the equation balanced.
P Flag question
Matt, shown below, is able to move
the large truck because
Answers
Four masses are arranged as shown. They are connected by rigid, massless rods of lengths 0.780 m and 0.500 m. What torque must be applied to cause an angular acceleration of 0.750 rad/s2 about the axis shown?
Answers
Given,
The length of the rods;
L=0.780 m
l=0.500 m
The angular acceleration, α=0.750 rad/s²
The masses;
m_A=4.00 kg
m_B=3.00 kg
m_C=5.00 kg
m_D=2.00 kg
The moment of inertia of the given system of masses is given by,
\(\begin{gathered} I=\Sigma mr^2 \\ =m_A(\frac{L}{2})^2+m_B(\frac{L}{2})^2+m_C(\frac{L}{2})^2+m_D(\frac{L}{2})^2 \\ =(\frac{L}{2})^2(m_A+m_B+m_C+m_D) \end{gathered}\)Where r is the distance between each mass and the axis of rotation.
On substituting the known values,
\(\begin{gathered} I=(\frac{0.780}{2})^2(4.00+3.00+5.00+2.00) \\ =2.13\text{ kg}\cdot\text{m}^2 \end{gathered}\)The torque required is given by,
\(\tau=I\alpha\)On substituting the known values,
\(\begin{gathered} \tau=2.13\times0.750 \\ =1.6\text{ Nm} \end{gathered}\)Thus the torque that must be applied to cause the required acceleration is 1.6 Nm
A ray of light in air is incident to an air-to-glass boundary at an angle of exactly 30° with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?
Answers
In order to calculate the angle of the refracted ray, we can use the law of refraction (Snell's Law) below:
\(\frac{\sin\theta_1}{\sin\theta_2}=\frac{n_2}{n_1}\)Where n1 and n2 are the indexes of refraction and theta1 and theta2 are the angles of the ray.
So, using n1 = 1, n2 = 1.65 and theta1 = 30°, we have:
\(\begin{gathered} \frac{\sin30°}{\sin\theta_2}=\frac{1.65}{1}\\ \\ \frac{\frac{1}{2}}{\sin\theta_2}=1.65\\ \\ \sin\theta_2=\frac{\frac{1}{2}}{1.65}=\frac{1}{3.3}=0.303\\ \\ \theta_2=17.64° \end{gathered}\)Three swimmers can swim equally fast relative to the water. They have a race to see who can swim across a flowing river in the least time. Swimmer A swims perpendicular to the current and lands on the opposite shore downstream, because the current has swept him in that direction. Swimmer B swims upstream at angle to the current, so that when she reaches the other side, she is straight across from where she started. Swimmer C swims downstream at an angle theta in an attempt to take advantage of the current. Who crosses the river in the least time?
Answers
A race car makes one lap around a track of radius 50 m in 9.0 s
Answers
The angular speed of the race car is 0.698 rad/s and the linear speed is 35 m/s.
What is the angular speed of the car?The angular speed of the race car is calculated by applying the following kinematic equation as follows;
ω = θ/t
where;
θ is the angular displacementt is the time of motionω = 2π/9
ω = 0.698 rad/s
The linear speed of the race car is calculated as shown below;
v = ωr
where;
ω is the angular speed of the carr is the radius of the circular pathv is the linear speedv = 0.698 rad/s x 50 m
v = 35 m/s
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The complete question is below:
A race car makes one lap around a track of radius 50 m in 9.0 s. Find the angular speed and linear speed of the race car.
True or False: The negative oxygen end of one water molecule is attracted
to the positive hydrogen end of another water molecule to form a
hydrogen bond.
Answers
Answer: I believe that it is true
Explanation: