Answer:
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Why is air considered a fluid
Answer:
A fluids is any substance that flows. Air is made of stuff, air particles, that are loosely held together in a gas form. Although liquids are the most commonly recognized fluids, gasses are also fluids. Since air is a gas, it flows and takes the form of its container.
Explanation:
Because it possesses the essential characteristics of fluids, air is regarded as a fluid.
A substance that may flow and take on the shape of its container is called a fluid. Here are several explanations for why air is seen as a liquid:
Air has the ability to flow and move freely. It can easily alter its location or direction of movement because it is neither hard nor fixed in shape.Air is fluid, allowing air molecules to readily flow past one another.Compressibility: Pressure-induced compression or expansion of air is possible. Air, like other fluids, has a property known as buoyancy that allows it to pull upward.Thus given these qualities, air satisfies the requirements for fluidity and is frequently categorised as such in the study of fluid mechanics.
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A stone is dropped from a 75-m- high building . When this stone has dropped 15 m, a second stone is thrown downward with an initial velocity such that the two stones hit the ground at the same time. What was the initial velocity of the second stone?
Answer:
The initial velocity of the second stone is 34.3 m/s
Explanation:
The distance height covered by the second stone will be
75m - 15m = 60 m
Since the two stones hit the ground at the same time.
Using third equation of motion, which state that;
V^2 = U^2 - 2gH
Where
U = Initial velocity
V = final velocity
H = 60 m
g = 9.81 m/s^2
As the stone reaching the ground, that is, coming to rest, V = 0. Therefore,
Substitute all the parameters into the equation
0 = U^2 - 2 × 9.81 × 60
U^2 = 1177.2
U = 34.3 m/s
The initial velocity of the second stone is 34.3 m/s
The average bullet has a mass of about 0.02 kg and travels at about 766 m/s when it's fired from a gun; how
much kinetic energy does the average bullet have when fired?
Answer:
5867.56 Newtons
Explanation:
KE = 0.5mv^2
KE = 0.5*0.02kg*766m/s = 5867.56N
Someone please answer all 5 will mark brainliest on first answer!!!!
Answer:
Explanation:
Electrons play a major role in all chemical bonds. There is one type of bonding called electrovalent bonding (ionic), where an electron from one atom is transferred to another atom. You wind up creating two ions as one atom loses an electron and one gains one.
1. Although the sun is shining, it is a little chilly today at the beach. You look at your portable thermometer, which says it's 10°C. What is the temperature in Fahrenheit and Kelvin? Show the equations you use to make these conversions. (4 points)
Answer:
(10°C × 9/5) + 32 = 50°F
10°C + 273.15 = 283.15K
Explanation:
what are examples of a medium?
A. water and air
B. amplitude and wavelength
C. crests and troughs
D. compressions and rarefactions
A hydrogen line in a star's spectrum has a frequency of 6.17*10^14 Hz when stationary. In Rigel's Spectrum, it is shifted downward by 4.26*10^10Hz. What is Rigel's velocity relative to us? m/s
Answer:
The correct answer will be "2.97 × 10⁸ m/s".
Explanation:
The give values are:
Observed frequency, [tex]F=4.26\times 10^{10} \ Hz[/tex]
Original frequency, [tex]F_{0}=6.17\times 10^{14} \ Hz[/tex]
Let the velocity of Rigel be = V m/s
As we know,
⇒ [tex]F_{0}=F\sqrt{\frac{C+V}{C-V}}\\[/tex]
On putting the values, we get
⇒ [tex]\frac{6.17\times 10^{14} }{4.26\times 10^{10} } =\sqrt{\frac{C+V}{C-V} }[/tex]
⇒ [tex]\frac{C+V}{C-V}=(14483.56808)^2[/tex]
⇒ [tex]\frac{C+V}{C-V}=209773744.2[/tex]
⇒ [tex]C+V=209773744.2 \ C-209773744.2 \ V[/tex]
⇒ [tex]C-209773744.2 \ C=209773744.2 \ V-V[/tex]
⇒ [tex]V=\frac{209773743.2}{209773745.2} \ C[/tex]
⇒ [tex]V=0.99 \ C[/tex]
So that the Rigel's velocity will be "0.99 C".
Now,
⇒ [tex]V=0.99\times 3\times 10^8[/tex]
⇒ [tex]=2.97\times 10^8 \ m/s[/tex]
True or false:Coordination is the ability to use the senses together with body parts during movement?
Answer:
Coordination is the ability to use the senses together with body parts during movement.
This statement is true.
For example, dribbling/juggling a soccer ball. Using feet and eyes together is called feet-eye coordination.
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Why is tornadoes hitting the east coast of the USA?
Answer:
The outbreak of tornadoes that tore across the Gulf and the East Coast Tuesday and Wednesday was unusual for two reasons. For one thing, the severe weather encompassed a significant swath of the country. For another, winter is the least likely time for tornadic thunderstorms.
Explanation:
The outbreak of tornadoes that tore across the Gulf and the East Coast Tuesday and Wednesday was unusual for two reasons. For one thing, the severe weather encompassed a significant swath of the country. For another, winter is the least likely time for tornadic thunderstorms.
And yet tornadoes are an expected part of life in the United States—especially in the multi-state area known as Tornado Alley. (Florida, too, sees a disproportionately high number of tornadoes, because of its frequent thunderstorms.) The United States gets more tornadoes, by far, than any other place on the planet. It averages about 1,250 twisters a year. Canada, which sees about 100 tornadoes per year, is a “distant second,” according to the National Centers for Environmental Information.
You are kicking your soccer ball back and forth on a soccer field. You kick the ball forward for 10 m. You turn completely around and kick the ball back for 20 m. Your turn again and kick the ball forward for 40 m. What is your distance and what is your displacedment?
Answer:
1.) Total distance = 70 m
2.) Total displacement = +30m
Explanation:
Distance is a scaler quantity. That is, we will be concerned about its magnitude only and not direction.
Total distance = 10 + 20 + 40 = 70 m
While displacement is a vector quantity. We will consider both the magnitude and its direction.
Forward direction will be positive while backward direction will be negative
Total displacement = +10 - 20 + 40
Total displacement = +30 m
A tuba creates a 4th Harmonic of frequency 116.5 Hz. When the first valve is pushed, it opens an extra bit of tubing 0.721m long. What is the new frequency of the 4th Harmonic? Hz
Answer: New frequency = 103.3Hz
Explanation:
Given that the
Frequency F = 116.5 Hz
The tube is an opened tube.
The relationship between wavelength and the length of the tube is
λ = 2L/n
Where
λ = wavelength
L = length of the tube
n = number of harmonic
For 4th harmonic,
λ = 2L/4 = L/2
But wave speed V = F(λ)
Substitutes (λ) into the wave speed formula
V = FL/2
Let's assume that the V is the speed of sound = 330m/s
Substitutes the V and F into the formula above.
330 = 116.5L/2
Cross multiply
660 = 116.5L
L = 660/116.5
L = 5.67 m
Given that the first valve is pushed, it opens an extra bit of tubing 0.721m long.
New length = 5.67 + 0.721 = 6.39 m
New frequency will be
330 = 6.39F/2
Cross multiply
660 = 6.39F
F = 660/6.39
F = 103.3 Hz
What is the frequency of UV light that has an energy of 2.39 × 10 -18 J?
Answer:
3.60 × [tex]10^{15}[/tex] Hz
Explanation:
[tex]\frac{2.39 * 10^{-18} J}{6.63 * 10^{-34} J.s}[/tex]
The frequency of UV light that has an energy of 2.39 × 10 -18 J is 3.60 × Hz.
What do you mean by frequency?The term frequency refers to the number of waves that pass a fixed point in unit time. It also describes the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.
Moreover, frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity, and is distinct from angular frequency. Frequency is measured in hertz which is equal to one event per second.
Therefore, the number of vibrations that a sound wave is making is called its frequency ( f ). Frequency can also be defined as the number of waves passing a given point in one second. Frequency is measured in hertz (Hz).
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Which elements on the periodic table have the lowest electronegativity?
A. Elements on the bottom left
B. Elements on the bottom right
C. Elements on the top right
D. Elements on the top left
Answer: A
Elements on the bottom left
Explanation:
Electronegativity of an element increases across the group in a periodic table. And decreases across the period in a periodic table. That is
Group 7, the halogen family has the highest Electronegativity and period one in that group has the highest.
A,B,C or D which of the following can be concluded regarding the movement represented in the graph?
Answer:
C. It remained at a constant speed
1. How far can your little brother get if he can travel at 2.5 m/s and in 5 seconds
you will discover that his squirt gun has run out of paint?
12.5 m/s
12.5 m
025
2 m
Answer:
12.5 meters
Explanation:
water enters a house from a ground like with an inside diameter of 2cm at an absolute pressure of 4.0×10^5Pa. A pipe that is 1cm leads to the second floor bathroom 5m above the ground floor. the flow speed at the ground pipe is 1.5m/s.
find the flow speed.
find the pressure.
find the volume flow rate in the bathroom.
Answer:
The flow speed , pressure and volume flow rate in the bathroom are 6 m/s , 3.3\times10^{5}\ Pa3.3×10
5
Pa and 0.47 L/s.
Explanation:
Given that,
Inside diameter = 2.0 cm
Pressure P= 4.0\times10^{5}\ paP=4.0×10
5
pa
Diameter of pipe = 1.0 cm
Speed at inlet = 1.5 m/s
Height = 5.0 m
(I). We need to calculate the flow speed
Using continuity equation
A_{1}v_{1}=A_{2}v_{2}A
1
v
1
=A
2
v
2
v_{2}=(\dfrac{D_{1}}{D_{2}})^2\times v_{1}v
2
=(
D
2
D
1
)
2
×v
1
Where, A₁ = area of inside
A₂ = area of
v₁ = speed at inlet
Put the value into the formula
v_{2}=(\dfrac{2.0\times10^{-2}}{1.0\times10^{-2}})^2\times1.5v
2
=(
1.0×10
−2
2.0×10
−2
)
2
×1.5
v_{2}=6 m/sv
2
=6m/s
(II). We need to calculate the pressure
Using Bernoulli equation
P_{2}+\dfrac{1}{2}\rho v_{2}^2+\rho g h_{2}=P_{1}+\dfrac{1}{2}\rho v_{1}^2+\rho g h_{1}P
2
+
2
1
ρv
2
2
+ρgh
2
=P
1
+
2
1
ρv
1
2
+ρgh
1
Put the value in the equation
P_{2}+\dfrac{1}{2}\times1000\times6^2+1000\times9.8\times5.0=4.0\times10^{5}+\dfrac{1}{2}\times1000\times(1.5)^2+1000\times9.8\times0P
2
+
2
1
×1000×6
2
+1000×9.8×5.0=4.0×10
5
+
2
1
×1000×(1.5)
2
+1000×9.8×0
P_{2}+18000+49000=4.0\times10^{5}+1125P
2
+18000+49000=4.0×10
5
+1125
P_{2}=4.0\times10^{5}+1125-67000P
2
=4.0×10
5
+1125−67000
P_{2}=3.3\times10^{5}\ PaP
2
=3.3×10
5
Pa
(III). We need to calculate the volume flow rate
Using formula of the volume flow rate
Q= vAQ=vA
Where, v = final velocity
A = area
Put the value into the formula
Q=6\times\pi\times(0.005)^2Q=6×π×(0.005)
2
Q=4.7\times10^{-4}\ m^3/sQ=4.7×10
−4
m
3
/s
Conversation:
Q=\dfrac{4.7\times10^{-4}\ m^3}{s}\times\dfrac{1000\ L}{1\ m^3}Q=
s
4.7×10
−4
m
3
×
1 m
3
1000 L
Q=0.47\ L/sQ=0.47 L/s
Hence, The flow speed , pressure and volume flow rate in the bathroom are 6 m/s , 3.3\times10^{5}\ Pa3.3×10
5
Pa and 0.47 L/s.yap
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Calculate 1.6 ∙ 103 times 3.0 ∙ 10-6.
Answer:
3,955.2
Explanation:
I think using order of operations PEMDAS this is right
What must you do if you plan to exercise everyday
Answer: set up a reminder so you won't forget also try clearing your schedule so you can have more time
The gravitational field strength at the Earths surface is 9.8 m/sec^2. What is the field strength at a distance two Earth radio beyond the surface?
Answer:
hope this helps you
..........
How are
global warming and the
carbon cycle related?
HURRY ITS DUE IN A COUPLE MINUTES!!
Answer:
The carbon cycle plays a key role in regulating Earth's global temperature and climate by controlling the amount of carbon dioxide in the atmosphere. The greenhouse effect itself is a naturally occurring phenomenon that makes Earth warm enough for life to exist.
As the burning of fossil fuels and landscape alterations, such as deforestation and industrial agriculture, mobilize fossil carbon into the atmosphere, the earth's carbon cycle is pushed out of balance and climate changes. Human generated climate change is an enormous perturbation in the global carbon cycle.
Explanation:
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Answer: Heat Cramps
Explanation:
Sunburn isn't caused by sweating. When one has heat stroke, they do not sweat. Heat cramps are a SYMPTOM of heat cramps, but heat exhaustion includes much more than just heat cramps.
A crane is used to lift an object. The crane applies a force of 400 to lift the object a distance of 25 meters in 20 seconds. Calculate the work in J performed by the crane to lift the object
Answer:
400*25
W = 10000 J
Explanation:
I believe time is irrelevant in work although it is important in the formula for power.
2. Only power tools with a 3-wire cord with
a ground are permitted by OSHA.
O
(A) True
(B) False
What do magnets have the acts on a object without touching them?
1. A power
2. A force
3. A machine
4. A current
Need help ASAP
Answer: A force
Explanation:
Answer:
it's a force because magnetics can act on a object from a distance because of gravitational force
Explanation:
Determine the relationship between neutron stars and black holes
Answer:
When a dying star has a mass which is 1.4 to 3 times that of the sun, it will form a neutron star. Stars with a mass greater than thrice the sun's mass, black hole is formed.
Explanation:
PLLSSSS HELP
MARKING BRAINLIST
SCIENCE
Answer:
the first one
Explanation: the first one because they were all on two different continents so when they seperated half of the species went on one continent and the other half went onto another one
Someone help please please
Answer:
Air currents. etc
Explanation:
I think air currents formed near the equator have something to do with this the ocean also effects the weather with it's moisture you will have to put this in your own words.
Which term related to electromagnetism applies only to electric force?
A. Attraction
B. Noncontact
C. Repulsion
D. Charge
The charge applies only to the electric force.
Is charge directly related to electric force?Electrostatic force is directly related to the charge of each object. So if the charge of one object is doubled, then the force will become two times greater. Two times 0.080 N is 0.160 N.
Does the electric force only act on objects with charges?Electric forces can only act between charged objects - either like-charged or oppositely-charged. Electric forces between two charged objects increase with increasing separation distance.
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In a transistor, collector current is controlled by
Base
Collector
Emitter
Answer:
Collector current is controlled by the Base current.
In a transistor collector current is controlled by: Base current ( A )
What is a transistor ?A transistor is an electrical device ( semi conductor ) which is used to switch off or on electrical signals and power. It can also amplify electrical signals and power. The collector current in a transistor is called by the base current when the transistor is in its active region.
Hence we can conclude that In a transistor collector current is controlled by: Base current ( A ) .
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a 1 kg box is being push across the floor. When pushed, the box accelerates at a rate of 1m/s 2. with what force is someone pushing on the box?
Answer:
Force, F = 1 N
Explanation:
We have
Mass of a box is 1 kg
Acceleration with which it is pushed is 1 m/s²
It is required to find the force acting on the box.
Force, F = ma
[tex]F=1\ kg\times 1\ m/s^2\\\\F=1\ N[/tex]
So, the force of 1 N is acting on the box.