Answer: A CT scan involves multiple X-Ray images
Explanation:
I did it and it was correct
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow.
[tex] \\ [/tex]
Answer:In a circuit, when the electrical resistance increases, the current decreases because it is blocking for the electrons to flow.
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The speed of sound in ice, water, and steam is shown.
A 3 column by 4 row table. Column 1 is titled Medium and includes the following entries: Ice, Water, Steam. Column 2 is titled Temperature (degrees Celsius) and includes the following entries: 0, 25, 100. Column 3 is titled Speed of Sound (meters per second) and includes the following entries: 3200 meters per second, 1500 meters per second, 346 meters per second.
What best explains the speed of sound in different states of matter?
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Sound travels slowest in steam because the sound has to move around the gas molecules that are far apart.
Sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy.
Sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.
Answer:
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Explanation:
The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
What is the effect of sound travel on ice?In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.
As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.
In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.
Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
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Mike is pushing a car up a ramp. What could Mike do to reduce the effort force he needs to use to push the car?
Answer:
He could use a really big pulley system or get in it and drive or call a tow truck.
Which of the following is true about the Sun?
A.
The Sun is the only star in the Solar System.
B.
The Sun is the only star in the Milky Way.
C.
The Sun is not a star.
D.
The Sun is the only star in the universe.
Angie, brad, and carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. All the masses and speeds are the same, says angie, so i think the blocks will have equal speeds after the collisions. But what about momentum? asks brad. The bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block. I think the bounce is an important factor, replies carlos. The steel block will be faster because the bullet bounces off it and goes back the other direction.
Answer:
Momentum must be conserved in the collision.
The steel block must move faster after the collision to preserve momentum.
If the steel block is moving faster it will aso have more kinetic energy.
(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)
A 3.00 kg bucket of water is raised with an upward acceleration of 2.20 m/s2 from a well by means of an attached rope. What is the tension in the rope
Answer:
F = M a
M = 3 kg
a = 2.2 m/s^2
T = tension in rope
T - M g = M a Where T - M g is the net force on the bucket
T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2 = 36 Newtons
Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m from the central image using a diffraction grating constant of 4.9 x 10-5 m. How far is the screen from the slits? SHOW ALL WORK
For Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m the distance of the screen from the slits is mathematically given as
D = 26m
How far is the screen from the slits?
Generally, the equation for the small-angle approximation is mathematically given as
x = n(Landa)D/d
therefore,
D = 0.10x4.9 x 10-5/(3x630 x 10-9)
D = 26m
In conclusion, the distance of the screen from the slits is
D = 26m
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The dwarf planet Pluto was discovered in 1930. Since that time, which jovian planet has completed a full revolution around the Sun?
Answer:
Explanation:
Uranus takes about 84 years to circle the sun.
Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.
. A marble sphere with a diameter of 1/4 inch is fully immersed in the oil of density 0.961 g/cm3 . Calculate the buoyant force exerted on the marble sphere by the oil.
Answer:
See below ( was it REALLY 1/4 INCH??)
Explanation:
Calculate the volume of the sphere
v = 4/3 pi r^3
this times the density of the oil will give g displacement
then f = ma
4/3 pi (.25 in * 2.54 cm/inch) ^3 * .961 = 1.0307 gm
1.0307 gm is .0010307 kg
f = ma = .0010307 * 9.8 = .0101 N
Which layer of the sun is where plasma rises and sinks due to temperature differences?.
Answer:
Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.
Explanation:
Which statement is true about the reaction shown by this chemical equation?
HCI + NaOH – NaCl + H20
O A. It is exothermic.
O B. It is a synthesis reaction.
O C. It is endothermic.
D. It is a combustion reaction.
SUBMIT
The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.
What is an exothermic reaction?In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.
The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.
From the given reaction,
HCl + NaOH --- NaCl + H₂O
HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.
When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.
When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.
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A pebble of mass 50g is moving with a velocity of 20m/s.What is its kinetic energy?
[tex] \bf\sf \underline{Given: - }[/tex]
[tex] \text{Mass of pebble= 50g}[/tex][tex] \text{Velocity of pebble= 20m/s}[/tex][tex] \bf\sf \underline{To \: Find: - }[/tex]
[tex] \text{Kinetic Energy of Pebble}[/tex][tex] \bf\sf \underline{Solution: - }[/tex]
We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,
1g = 0.001kg,
⠀⠀⠀50g = 0.05g
Now we know the formula of Kinetic energy,
[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]
Hence, the kinetic energy of the pebble is 10J.
Reducing access to waterways will lead to an increase in human impact on waterways. please select the best answer from the choices provided t f
Answer:
F
Explanation:
Reducing access will cause less damage to occur
Answer: the answer is false
Which of the following processes is more easily observable for light with a short wavelength?
help please.
Answer:
Option B
Explanation:
Option B
Answer is PHOTOELECTRIC EFFECT
True or False : If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
Answer:
Your answer would be:
B.) False
If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.
Explanation:
Have a great rest of your day
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is it possible to put negative and positive charge at same time at electroscope leaves?
Answer:
No
Explanation:
If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together
How does water form in the clouds? Explain how
When air rises in the atmosphere it gets cooler and is under less pressure. When air cools, it's not able to hold all of the water vapor it once was. Air also can't hold as much water when air pressure drops. The vapor becomes small water droplets or ice crystals and a cloud is formed.
I hope this helps you..
A piece of zinc was lying outside and had a temperature of 26 degrees C. Later that day the sun came out and the temperature increased to 36 degrees C. If the piece of zinc is only 0. 15 kg, find the thermal energy. NOTE: Zinc has a specific heat of 380 J/kg degrees C). I need The Equation used and The Answer
Answer: 570 J
Explanation:
The amount of heat gained by the piece of zinc can be calulctaed using ∆Q = mc∆T
=> ∆T = 36-26 = 10°C
m = 0.15 kg, s = 380J/kg/°C
=> ∆Q = 0.15 x 380 x 10
= 570J
what would happen in a capacitor if the dielectric was not made out of an insulator
[tex]
\mathbb \blue{Answer }[/tex]
[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]
[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]
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Write your own real-world scenario where the Pythagorean Theorem can be applied to find a missing piece. You may choose to write a problem that is two- or three-dimensional in nature. Be sure that you will be able to draw a diagram of your scenario.
Write out your problem and submit it for Part 1. Be sure to end your scenario with a question
Answer:
hey
Explanation:
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
What is Pythagoras Theorem ?Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.
Here,
The Pythagoras Theorem can be written as,
c² = b² + a²
where c is the hypotenuse, b is the base and a is the altitude of the triangle.
An example of application of the Pythagoras theorem is,
A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?
A line drawn from his current position and his initial point represents the displacement covered by the man.
Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.
Drawing a figure including all the data, we get a right angled triangle, ABC. So,
The base of the triangle, BC = 6 km
Altitude of the triangle, AB = 8 km
The displacement of the man = hypotenuse of the triangle
d = AC
According to Pythagoras Theorem,
AC² = BC² + AB²
AC² = 6² + 8² = 100
AC = √100
Therefore, displacement, d = AC = 10 km.
Hence,
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
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Attaching the image file here.
A circular loop of wire 75 mm in radius carries a current of 113 A. Find the (a) magnetic field strength and (b) energy density at the center of the loop.
The magnetic field strength is 9.47 ×10⁻⁴ T
The energy density at the center of the loop is 0.36 J/m³
Calculating Magnetic field strength & Energy densityFrom the question, we are to find the magnetic field strength
The magnetic field strength of a loop can be calculated by using the formula,
[tex]B = \frac{\mu_{0} I}{2R}[/tex]
Where B is the magnetic field strength
[tex]\mu_{0}[/tex] is the permeability of free space [tex](\mu_{0}=4\pi \times 10^{-7} \ N/A^{2})[/tex]
[tex]I[/tex] is the current
and R is the radius
From the give information,
[tex]R = 75 \ mm= 75 \times 10^{-3} \ m[/tex]
and [tex]I = 113 \ A[/tex]
Putting the parameters into the formula, we get
[tex]B = \frac{4\pi \times 10^{-7} \times 113}{2 \times 75 \times 10^{-3} }[/tex]
[tex]B = 9.47 \times 10^{-4} \ T[/tex]
Hence, the magnetic field strength is 9.47 ×10⁻⁴ T
Now, for the energy density
Energy density can be calculated by using the formula,
[tex]u_{B} = \frac{B^{2} }{2\mu_{0} }[/tex]
Where [tex]u_{B}[/tex] is the energy density
Then,
[tex]u_{B}= \frac{(9.47\times 10^{-4} )^{2} }{2 \times 4\pi \times 10^{-7} }[/tex]
[tex]u_{B} = 0.36 \ J/m^{3}[/tex]
Hence, the energy density at the center of the loop is 0.36 J/m³
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How is "one second time" defined in SI system?
Answer:
Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
This definition refers to a caesium atom at rest at a temperature of 0 K
Explanation:
A sound wave, generated at a frequency of 440 hertz has a wavelength of 2.3 meters as it travels through a solid material. The approximate speed of the wave is ____ m/sec.
The approximate speed of the sound wave traveling through the solid material is 1012m/s.
Wavelength, Frequency and SpeedWavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
From the wavelength, frequency and speed relation,
λ = v ÷ f
Where λ is wavelength, v is velocity/speed and f is frequency.
Given the data in the question;
Frequency of sound wave f = 440Hz = 440s⁻¹Wavelength of the wave λ = 2.3mSpeed of the wave v = ?To determine the approximate speed of the wave, we substitute our given values into the expression above.
λ = v ÷ f
2.3m = v ÷ 440s⁻¹
v = 2.3m × 440s⁻¹
v = 1012ms⁻¹
v = 1012m/s
Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.
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THE RESPIRATORY SYSTEM - 3/3
11. The epiglottis closes when someone swallows to protect the lungs?
True or False
12. Drinking too much alcohol can cause snoring due to a relaxation in which part of the respiratory system?
uvula
epiglottis
pharynx
larynx
13. What is analogous to the structure of the respiratory system?
an upside-down deciduous tree
the solar system
the Mississippi River, delta, and the Gulf of Mexico
the archipelago of islands that make up Hawaii
14. Which type of disease is characterized by a progressive obstruction of exhalation mechanisms?
pneumonia
COPD
asthma
dyspnea
Answer:
11. true
12.
13. an upside down tree
14. copd
An object with a mass of 2.0 kg accelerates 8.3 m/s? when an unknown force is applied
to it. What is the amount of the force?
Answer:
16.6 NExplanation:
We know the relation :
Force = Mass x AccelerationWe are given that :
Mass = 2.0 kgAcceleration = 8.3 m/s²Hence, on substituting the values in the equation :
F = 2.0 x 8.3F = 16.6 NThe given information is,
→ Mass = 2 kg
→ Acceleration= 8.3 m/s
→ Force = F (in Newton)
Now we have to find the,
→ Amount of force applied to the object.
Formula we use,
→ F = Mass × Acceleration
Then the amount of force will be,
→ F = Mass × Acceleration
→ F = 2 × 8.3
→ [ F = 16.6 N ]
Hence, the amount of force is 16.6 N.
Question 20 I need help ASAP!!
Answer:
1.) Gas = Are the particles moving quickly in a radom pattern?
2.) Plasma = Are the particles electrically charged?
3.) Solid = Are the particles vibrating in a fixed position?
4.) Liquid = Are the particles sliding past each other?
Hope this helps!
A spacecraft flies within 500,000 km of each of these planets. Based on its mass, which planet would gravitationally attract the spacecraft the least?
Answer:
Mars
Explanation:
It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.
I hope it helps! Have a great day!
Anygays-
Which of the four numbered galaxies have ongoing star formation?.
The image here is not found here but star formation is characterized by clouds of dust where stars are born.
What is star formation?Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.
Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).
Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.
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A 160 kg cart has a momentum of 870 kg m/s. What is the velocity of the cart?
Answer: 5.44 m/s
Explanation:
Given:
Mass of cart: 160 kg
Momentum of cart: 870 kg•m/s
[tex]$$Momentum $|\rho|=m \times v$$$\begin{aligned}&870 \ kg\cdot m/s=160 \mathrm{~kg} \times v \\&v=5.44 \mathrm{~m} / \mathrm{s}\end{aligned}$$[/tex]
Answer:
The momentum is defined as :
P=mv
Where m is the mass and v is the velocity. In this case we know the mass is 160 kg and the momentum is 870 kg plugging in this equation above and solving for the velocity we have
870=160V
V=870÷160
V=5.44
Therefore, the velocity of the cart is 5.44 m/s.
Why do planets like Jupiter and Saturn have large gas atmospheres while Mercury and Mars do not?
options:
Because Jupiter and Saturn have more mass
Because of each planets distance from the Sun
Because of their different orbits around the Sun
Because they were formed at different times
The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.
Explanation:
Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.