Answer:
a large elliptical galaxy
Explanation:
calculate area triangle 15*20
Answer:
300
Explanation:
15 * 20 = 30
15 *
20 =
——
300
Use the circuit diagram to decide if the lightbulb will
light. Justify your answer
Any circuit diagram given the funda is same .
Look at the switch symbol in circuit (Mostly present after cell symbol) If there is a dot present the circuit is closed and current cannot be flowed so lightbulb won't light.If not present a dot then lightbulb will lightAnswer:
see picture
Sample Response: The lightbulb will light because this is a parallel circuit. Even though the switch is open in one branch, the branch the lightbulb is in forms a closed circuit, allowing the current to flow through the bulb.
Explanation:
A motorcycle starts 20m west of a reference point. It moves at a constant velocity for 5s, reaching a position of 10m east of the reference point.
What is the motorcycle’s average velocity?
The motorcycle's average velocity will be 6 m/sec. The ratio of the overall distance traveled to the total time taken by the body is the average velocity.
What is average velocity?The average velocity is the ratio of the total distance traveled to the total time taken by the body. Its unit is m/sec.
Total distance travelled by the motorcycle;
d=20 m+10 m
d=30 m
The average velocity is found as;
[tex]\rm v_{avg}=\frac{d}{t} \\\\ \rm v_{avg}=\frac{30}{5} \\\\ v_{avg}= 6 \ m /sec[/tex]
Hence,the motorcycle’s average velocity will be 6 m/sec.
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Stio
choose the true statements about magnetic fields and forces. (choose 3)
the north pole attracts the south pole of a magnet.
the north pole repels the south pole of a magnet.
forces caused by magnetic fields are weaker closer to the magnet.
forces caused by magnetic fields are weaker farther from the magnet.
magnetic forces can act on an object even if the object isn't touching the magnet.
an object must be in touching a magnet in order for a magnetic force to act on it.
3 pt
The true statements about magnetic fields and forces will be A,D and E.
What is a magnet?An iron piece,alloy, or other substance with its constituent atoms arranged in such a way that it shows magnetism qualities,
The function of the magnet is attracting other iron-containing objects or aligning itself in a magnetic field.
There are two poles of the magnet;
1. North Pole.
2. South Pole.
The same poles repel each other, while the opposite poles attract each other. In a sense, south-south and north-north repel. While the north-south and the south-north attract each other.
The correct statements are;
(A). The north pole attracts the south pole of a magnet.
(D)Forces caused by magnetic fields are weaker farther from the magnet.
(E)Magnetic forces can act on an object even if the object isn't touching the magnet.
Hence, the true statements about magnetic fields and forces will be A,D and E.
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Coffee or certain cola drinks can be used to test the effect of __________ on reaction time. What drug completes the sentence?
Answer:
"caffeine" both products contain this compound
What kind of atmosphere surrounds mercury?
none
carbon dioxide
methane
dense clouds
Answer:
None
Explanation:
Mercury does not have a atmosphere because it is simply to hot. Because of its temperature it's atmosphere is constantly being replenished as the atoms escape into space.
Suppose two objects attract each other with a gravitational force of 32000 Newtons. If the distance between the two objects is quartered (times 1/4).
then what is the new force of attraction between the two objects
The new force of attraction between the two objects will be 16 times the old case.
What is Newton's law of gravitation?Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force.
Gravitational force is proportional to the product of the masses of the two bodies and inversely proportional to the square of their distance.
[tex]\rm F =\frac{GmM}{r^2}[/tex]
For case 1;
r₁=r
For case 2;
r₂=r/4
[tex]\rm F'=\frac{GmM}{(\frac{r}{4})^2} \\\\ F'=16 F[/tex]
Hence,the new force of attraction between the two objects will be 16 times the old case.
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Question 12 A wave has a wavelength of 7.96 m and travels at 30.67 m/s. What is the frequency of the wave?
Answer:
0.2597hertz
Explanation:
first of all we have to calculate time.
time is given by speed/distance
hence=30.67/7.96
=3.85s
frequency is given by 1/time
=1/3.85
=0.2597hertz
the amount of energy at the end of the system (output) is different from the starting energy (input). How does this not violate (break) the law of the conservation of energy. This question is based on solar and wind energy
Answer:
Because some of the energy escaped or was used.
Explanation:
Which of the following materials used by plants to make food can be found in the air?
A) pollen
B) soil
C) oxygen
D) carbon dioxide
Answer:
number d
Explanation:
because plant need carbondioxide
Light travels at 3.0 × 108 m/s in a vacuum
(about the same in air) - how many km/h is
this?
We've got m/s, which is value of distance ÷ time
(distance/time)
3 x 10^8 is:
300,000,000m/s
1km = 1000m
1hr = 3600secs
So, divide 300,000,000m by 1000 to get in km & you get:
300,000km
Now divide this value by 3600 seconds to get it in km/hr
300,000km/3600 = 83.33333333
Thus, answer is 83.3km/h
Or
8.33 x 10^1 km/h (in standard form)
(doing 83.3 recurring multipled by 1000 & 3600 gets you back to original answer. So, 83.33333...x1000x3600= 300,000,000)
Hope this helps!
After reading the passage about acupuncture, identify which scientific claim explains why some people say acupuncture does not truly relieve pain.
Answer:
The answer would be "This ancient form of pain relief and stimulation is said to benefit patients by blocking channels which practitioners claim
Explanation:
Answer:
It provides only a placebo effect.
Explanation:
Edge
How many basic states of matter exist?
three
two
five
four
Answer:
There are four basic states of matter
A monochromatic beam of light is absorbed by a collection of ground-state hydrogen atoms in such a way that three different wavelengths are observed when the hydrogen relaxes back to the ground state.
Answer:
If the absorbed beam is monochromatic (one wavelength) then it excites the H atom to some state n.
When that state decays, some of the atoms may decay to state 1, others to state 2, and still others to state 3
The net energy emitted in such a case would depend on:
n -1, n - 2, n - 3 which would produce 3 different wavelengths
What happens when oxygen comes in contact with NOx and VOCs?
1. They combine to create ozone to replenish the ozone layer.
2. Oxygen neutralizes NOx and VOCs.
3. They combine to form low altitude ozone.
4. They combine to form smog.
When oxygen comes in contact with NOx and VOCs They combine to create ozone to replenish the ozone layer. Option A is correct.
What is an ozone layer?The layer form on the stratosphere region of the earth, which absorbs most of the ultraviolet rays.
The ultraviolet rays come from the sun are very harmful, increases global warming when enter inside the ozone layer due to its deplection.
When oxygen comes in contact with NOx and VOCs They combine to create ozone to replenish the ozone layer.
Hence, option A is correct.
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Question 1
A bus travels 5 km east. Then it travels 3 km west by the same path and stops.
What is the bus's displacement?
O 10 km
O2 km
O3km
O 8 km
Study the image.
The image shows the electric field lines between two charged plates.
Which statement would be true for these plates?
Select one:
A. The right plate is neutral.
B. The right plate is positively charged.
C. The left plate is positively charged.
D. The left plate is neutral.
Is quartzite a mineral, a rock, or neither?
7,293 ÷ 8 what is this
Answer: 911.625
Explanation:
Answer:
911.625 is the answer of your question
Chris shines a white light onto a surface, and the surface appears to be green. What color will the surface appear if he shines a combination of blue and green light on the surface?.
Answer: just realized this is more advanced physics so if this doesn't seem right I apologize, I had a really bad physics teacher lol. So ignore this for now!
Hey there! I think this might just be basic color mixing! The color would be a turquoise
Explanation: R G B make up our visible light spectrum. This has documented graphs. Through basic use of one, you can determine that the color would be a blue-green, commonly referred to as turquoise! There are many more color combinations then just this one as well!
aristotle classified animals on the basis of?
Answer:
Aristotle classified animals on the basis of habitat.
Explanation:
Hope it helps you :)))))
have a good day
Equipment used to measure the volume of the brass pieces
I believe a scale is good
The force of gravity on an object varies directly with its mass. The constant of variation due to gravity is 32. 2 feet per second squared. Which equation represents F, the force on an object due to gravity according to m, the object’s mass? F = 16. 1m F = F equals StartFraction 16. 1 Over m squared EndFraction. F = 32. 2m F = F equals StartFraction 32. 2 Over m squared EndFraction.
Answer:
F = 32.2 m
Explanation:
F = ma
F = m * 32.2
what is collinear and concurrent
Answer:
Collinear Force System: When the lines of action of all the forces of a system act along the same line, this force system is called collinear force system. Concurrent Force System: The forces when extended pass through a single point and the point is called point of concurrency.
Base your answers to questions 11 through 13 on the information and diagram below and on your
knowledge of physics.
A ray of light with a frequency of 5.09 x 104 hertz traveling in medium X is refracted at point P.
The angle of refraction is 90°, as represented in the diagram.
Normal
Air
Refracted ray
Medium X
f = 5.09 x 1014 Hz
11. Calculate the wavelength of the light ray in air. [Show all work, including the equation and
substitution with units.]
12. Measure the angle of incidence for the light ray incident at point P.
13. Calculate the absolute index of refraction for medium X. [Show all work, including the equation and
substitution with units.]
Incident ray
11. The wavelength of the light ray in air is 0.589 x 10⁻⁶ m.
12. Angle of incidence for the light ray at point P is 43.23°.
13. The absolute index of refraction for medium X is 1.46
What is Snell's law?It states that the ratio of sine of angle of incidence and angle of refraction is equal to the refractive index of first medium to the second medium.
sini/sinr = n₁/n₂
11. The wavelength is related to the frequency as
λ = c/f
where c = 3 x 10⁸ m/s and frequency f = 5.09x 10¹⁴ Hz
Put the values, we get
λ = 3 x 10⁸/ 5.09x 10¹⁴
λ =0.589 x 10⁻⁶ m
Thus, the wavelength of the light ray in air is 0.589 x 10⁻⁶ m.
12. Given the angle of incidence is i, angle of refraction r =90° , n₂ = Refractive index of medium X = 1.46 and n₁ = Refractive index of air = 1
Substituting the values into Snell's law expression we get,
sin i= sin 90 x 1/1.46
i = 43.23 degrees
Thus, the angle of incidence is 43.23 degrees.
13. The refractive index is the ratio of speed of light in vacuum to the speed of light in the medium X.
n = c/v₂
If v₂ is the velocity of light in medium X, then
sin i / sin r = v₂/v₁
sin 43.23 / sin 90 = v₂/ 3 x 10⁸
v₂ = 2.055 x 10⁸ m/s
So, the refractive index be
n = 3 x 10⁸/2.055 x 10⁸
n = 1.46
Thus, absolute index of refraction for medium X is 1.46
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what evidence is there suggesting ellipticals may form from the mergers of 2 or more spiral galaxies
Elliptical galaxies could be formed by the collision and merging of two spiral galaxies.
What is galaxy?Galaxy is the huge collection of stars, interstellar gases, dust particles, stones. Galaxies tend to come in two shapes such as spirals and ellipticals.
In spiral galaxies, the stars orbit in a very thin disk, and all the stars move in the same direction. Two or more spiral arms wind around the center just like a pinwheel.
Selecting a sample of about 50 spiral galaxies that have collided and in the process of merging into a single object. We took infrared images using the UH 88-inch (2.2-meter) telescope, and obtained spectra of these mergers using one of the Keck telescopes.
Infrared images are used to see, if the starlight in these objects decreases with distance from the center of the galaxy the way it does in spirals or the way it does in ellipticals. The light intensity decreases exponentially in outward direction from the centers of spirals, but it declines much more slowly with distance from the center for ellipticals. It is found that at least 45 out of 51 mergers are ellipticals.
Thus, most of these mergers really are evolving into elliptical galaxies.
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A. 15
B. 1
C. 5
D. 9
The correct answer is D (I’m pretty sure) but I don’t quite get how to read the ammeter… It would be helpful if someone can explain in a few sentences why it’s 9 :)
Select the most accurate summary of kaku’s argument. newton’s scientific study transformed knowledge of the ocean and encouraged countless transformative inventions. newton’s discoveries led to the invention of machines and the beginning of an industrialized society. newton’s invention of the steam engine revolutionized transportation around the world. newton’s followers invented the machines that later stimulated factory productivity and success.
The most accurate summary of kaku’s argument is Newton’s discoveries led to the invention of machines and the beginning of an industrialized society.
What was Isaac Newton's most important discovery?According to her, “two bodies attract each other with a force proportional to their masses and inversely proportional to the square of the distance separating their centers of gravity”. With this discovery, Newton eliminated dependence on divine action and began modern science.
The text is about the achievements of Newton that led to the industrial progress, having strong impact on many generations incuding modern generations.
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Answer:
Newton’s discoveries led to the invention of machines and the beginning of an industrialized society.
Explanation:
Thumper (a rabbit) runs and jumps on a frozen lake, sliding at 8 m/s. He slides for 12 s before coming to a stop. What is the coefficient of kinetic friction between Thumper and the ice
The coefficient of kinetic friction between Thumper and the ice is determined as 0.1.
Coefficient of kinetic frictionThe coefficient of kinetic friction between Thumper and the ice is determined as follows;
μk = a/g
where;
a is accelerationg is acceleration due to gravitya = v/t
a = 8/12
a = 0.667 m/s²
μk = a/g
μk = 0.667/9.8
μk = 0.1
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Mr. Ramirez demonstrates that objects can exert forces on each other even when the objects
are not touching. He removes two long pleces of clear plastic tape from a tape dispenser. He
holds a piece of tape in each hand so that they are hanging down. As he moves his hands closer together, the pieces of tape repel each other. His students then plan an investigation to study the forces exerted by the pieces of tape. a. Identify two factors that may affect the forces exerted by the pieces of tape. Explain your
reasoning.
b. Describe how the effect of one of the factors you identified in part (a) could be tested. Be sure to include a description of how the effect would be measured and how the collected data would be analyzed.
The two factors that may affect the forces exerted by the pieces of tape are the charge on the tape and distance between them.
The effect of one of the factors could be tested by altering the distance and calculating the forces between them.
What is force?A force is the push or pull which make a body to move or stop it.
a. When two objects are kept apart. they are always attracted when uncharged kept at any distance.
When the objects are charged, the force will be attractive or repulsive.
The distance between those charged objects increase or decrease in strength depending on the distance between them.
Thus, the two factors that may affect the forces exerted by the pieces of tape are the magnitude of charge on the tape and distance between them.
b. By increasing the distance between the tapes, we can find the strength of forces.
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