A vertical rectangular box with a left side that bows out is a convex mirror. A convex mirror reflects light outwards, it cannot be utilized to concentrate light.
What is a convex mirror?
A convex mirror, also known as a curved mirror, has a reflecting surface that bulges toward the light source. A curved mirror's surface can be convex, or bulging outward, or concave, or bulging inward.
A convex mirror is a hollow spherical is divided into pieces, the exterior surface of each cut portion is painted. The image of the plant has real, inverted, and smaller characteristics.
A vertical rectangular box with a left side that bows out is a convex mirror. A convex mirror reflects light outwards, it cannot be utilized to concentrate light.
Hence, option A is correct.
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Answer:
the answer is a
Explanation:
Viewed from a distance, how would a flashing red light appear as it fell into a black hole?.
Explanation:
Light rays that pass close to the black hole get caught and cannot escape. so what ends up happening to the light is that it starts bending due to the strong gravitational force of the black hole.
A liquid exerts the pressure of 5000 Pascal at the bottom of vessel.If the depth of liquid is 2 m,find the density of the given liquid. (g=10 metre per square)
Please help!
Answer:
250
Explanation:
pressure = depth x density of liquid x g
5000 = 2 x density x 10
density = 250
Seth and Diana were asked to be the leaders for a game of tag during recess at school. Seth and Diana can ensure that all interested students get a chance to participate equally regardless of ability to run fast by having the: Tagged players sit out until the next game starts Tagged players perform a fitness activity then return to the game Two youngest students be the taggers Two fastest students be the taggers
Answer:
B
Explanation:
did this yesterday with my friend
Answer: Tagged players perform a fitness activity
Explanation: Proof of validity is shown below.
Micah, a young adult, reads a diary he kept in high school, laughing at his former self. He wonders how he could
have thought he was so deeply in love that he'd found his soulmate at the age of 13. What part of Micah's brain
has developed since he was 13 to give him this perspective?
Hypothalamus is the region of brain is the control centre of love and also make the limbic system of our body.
What is hypothalamus?The hypothalamus is the region of the brain that makes up the limbic system and is considered as the control centre of love. It gathers the various stimuli felt by the body such as smells, touches, sounds and formed the physical response to the emotions associated with those stimuli.
So we can conclude that hypothalamus is the region of brain is the control centre of love.
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The form of energy associated with the motion, position, or shape of an objects called:.
What is average velocity?
Answer:
amount of displacement divided by the time the displacement occurs
Explanation:
Best answer of those given
Define 1 joule work done.
Answer:
1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.
Explanation:
When the reflecting wave flips upside-down on a stretched
string, which of the following is correct?
a The stretched string is with a fixed boundary
b The stretched string is with a free boundary
с
The stretched string may have a fixed boundary or
a free.
d The given information is not enough.
e None of the above is correct.
The reflecting wave flips upside-down on a stretched string when the wave moves from a less dense part of the rope moves toward a boundary that has a higher density. Hence the correct answer is (Option E).
What is a Reflecting Wave?A reflecting wave is a wave that abruptly changes its propagation direction when it hits the boundary between two media.
An echo is a real-world example of a reflecting wave.
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1.0 A weightlifter picks up a barbell.
1.1 .10. Which type of energy is stored in the barbell when it is held above the weightlifter's head?
[1 mark]
Put an X in one box only.
11
Chemical potential
Elastic potential
Gravitational potential
Kinetic
The type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
What is potential energy?This is the type of energy possessed by an object due to its position above te ground level.
Potential energy of an object is given by the following formulas;
P.E = mgh
where;
m is mass of the objecth is the height above the groundg is gravityThus, the type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
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An electron (me = 9.1 x 10-31 kg) traveling south at a constant speed of 5.0 x 106 m/s enters a
region where the downward component of earth's magnetic field is 3.5 x 10-5 T. What is the
magnitude and direction of the acceleration of the electron at this instant?
Answer:
F = Q V X B
V X B = south X downard = East - deflection is West
Since Q is negative the deflection = West
a = F / m = Q V B / m
a = 1.6E-19 * 5*E6 * 3.5E-5 / 9.1E-31
a = 1.6 * 5 * 3.5 / 9.1 * 10^13 m/s^2 = 3.1 * 10^13 m/s^2
Define the following words:
Phylogenetic:
Bifurcation:
Taxonomy:
Prokaryote:
Eukaryote:
Virus:
Classification:
Biotype:
(brainliest if you use your own words) please hurry!!!
The opening graph in the video shows the measured relative abundances of elements in the galaxy. What is the 4th most abundant element?.
Answer: Carbon
Explanation:
The opening graph in the video shows the measured relative abundances of elements in the galaxy. What is the 4th most abundant element? Carbon has the fourth highest dot on the graph, and therefore is the fourth most abundant element.
Answer:
Carbon is the masured relative abundant element.
What conditions are necessary for total internal reflection to occur?.
Answer: When a ray of light travels from an optically denser medium to an optically rarer medium and is incident at an angle greater than the critical angle for the two media, the ray totally reflects back into the medium, obeying the laws of reflection. This phenomenon is known as the total internal reflection.
Explanation:
Distance meters Time (seconds) Trial Tria 2 Trials Average 3 053 059 0.52 055 6 106 719 104 Uning the values trom the data table calculate the speed of the object that traveled 3 meters Round your value to two decimal places past the Decimal 5 4545 m/s 0.18 m/s 0183333 ms 545ms
Answer:
I'm pretty sure it's the last one, or D.
Explanation:
I did the math in my head so forgive me if I'm wrong :)
Which is an example of current electricity
Water vapor is an important greenhouse gas in Earth's atmosphere. The map here shows the average amount of water vapor in a column of atmosphere during one month in 2015.
Based on the data in the map where would you expect temperatures on Earth to be warmest?
• At higher altitudes
• Over the poles
• At the equator.
• Over landmasses
Answer:
The answer in C- At the equator
Explanation:
just took the test and got it correct
Based on the data in the map, the temperatures on Earth to be warmest will be at equator. The third option is correct.
What is greenhouse gas?The gases which get easily trapped inside the glasses and increase the temperature of the atmosphere causing the global warming level to increase overall.
Water vapor is an important greenhouse gas in Earth's atmosphere. The map here shows the average amount of water vapor in a column of atmosphere during one month in 2015.
Based on the data in the map, the temperatures on Earth to be warmest will be at equator.
Thus, third option is correct.
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White light is sent through glass prism. Which color is refracted the most?.
Tomas lives in Brazil. When he looks up to the night sky, he always sees the same side of the Moon. Why does this happen?
A
The Moon orbits the Earth in the same length of time that it takes to make one revolution on its axis.
B
The Moon is stationary on its axis as it orbits the Earth.
C
The Moon orbits the Earth in the same length of time that it takes for the Earth to orbit the Sun.
D
The Moon is stationary in the sky in relation to Earth.
Answer: The answer is C. Hope it helps!!, and if you get it wrong it's my fault
Why are choir concerts better in performance halls than in gymnasiums?
Please Mention the scientific terms.
Reflection, Refraction, Diffraction, Echo, Constructive Interference, Destructive Interference, Doppler Effect and Longitudional Waves.
Constructive interference in performance halls and the elimination of echoes are reasons why choir concerts better in performance halls than in gymnasiums.
What is constructive interference?Constructive interference is a phenomenon which occurs when two waves travelling in same direction and which are in phase add up together to produce a wave of greater amplitude.
Constructive interference occurs in performance halls while destructive interference occurs in gymnasiums.
Also in performance halls, echoes are minimized due to the padded walls and the curtains while echoes which disturb choir concerts occur in gymnasiums.
Therefore, choir concerts better in performance halls than in gymnasiums because of constructive interference in performance halls and the elimination of echoes.
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A block of mass 3. 0 kg is hung from a spring, causing it to stretch 12 cm at equilibrium, as shown above. The 3. 0 kg block is then replaced by a 4. 0 kg block, and the new block is released from the position shown above, at which the spring is unstretched. How far will the 4. 0 kg block fall before its direction is reversed?.
Based on the length of the spring and the mass of the block, the distance the 4.0 kg block can fall before a reversal in direction is 32 cm.
How do we arrive at 32cm?Because energy is conserved, the distance the block can drop can be found as:
Mass x gravity x distance = (1 / 2) x spring constant x distance ²
Spring constant:
= (Mass x gravity) / distance
= (3 x 9.8) / 12
= 2.45 cm
Distance is:
Mass x gravity x distance = (1 / 2) x spring constant x distance ²
distance = (2 x Mass x gravity) / spring constant
= (2 x 4 x 9.8) / 2.45
= 32 cm
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Q1. Explain the conservation of energy in terms of the energy transformation(s) that occur when you strike (light) a match.
Q2. When you turn on a lamp at home you are using electricity generated by a power company or public utility. Assume the electricity powering the lamp was generated at a coal burning power plant and explain the conservation of energy in terms of the energy transformations that occur when you turn on the lamp.
Q3. Unless you push a pendulum at the start of it's swing (doing work to give it extra energy), will it ever swing higher than it's starting point? Explain your answer in terms of kinetic and potential energy.
Q4. Does a pendulum swing forever? Why or why not?
Q5. Unless you push a pendulum at the start of it's swing (doing work to give it extra energy), will it ever swing higher than it's starting point? Explain your answer in terms of kinetic and potential energy.
Q6. Describe the transformations between potential and kinetic energy when you drop a 15000 gram television from a height of 0.8 meters.
Q7. A car with a mass of 860 kg sits at the top of a 32 meter high hill. Describe the transformations between potential and kinetic energy that occur when the car rolls to the bottom of the hill and continues rolling.
Q8. How is the previous problem different from ones where the object comes to a stop at the end of moving/falling? Discuss what happens to the energy in each case and how they are different.
Q9. Describe the transformations between potential and kinetic energy that occur when a 1000 kg rock falls from the top of a 18 meter cliff.
Q10. How much kinetic energy does a 2000 gram ball have the instant before it hits the ground after falling from a height of 6 meters?
Q11. Assume the collision in problem 10 is perfectly elastic (no energy is lost) and there is no air friction. How high should the ball bounce? Describe the transformations between potential and kinetic energy that will occur from when the ball is dropped till it reaches the top of it's first bounce.
1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.
2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.
3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .
4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.
5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .
6)
Mass (m)⇢15000 gram = 15 kgHeight(h)⇢0.8 metersAcceleration due to gravity(g)⇢9.8m/s²Potential energy ⇢mghPotential energy ⇢(15 x 9.8 x 0.8 )JPotential energy ⇢117.6 J7)
Mass (m)⇢15000 gram = 860 kgHeight(h)⇢32metersAcceleration due to gravity(g)⇢9.8m/s²kinetic energy ⇢mghkinetic energy ⇢(860 x 9.8 x 32 )Jkinetic energy ⇢269,696 J8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .
9)
Mass (m)⇢ 1000kgHeight(h)⇢18 metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(1000x 9.8 x 18 )JKinetic energy ⇢176,400 J10)
Mass (m)⇢ 2000 gm = 2kgHeight(h)⇢6metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(2x 9.8 x 6 )JKinetic energy ⇢117.6 J11)
In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J
How are temperature and molecular motion related?
Answer:
temperature is essentially the speed of the molecules.
Explanation:
temperature is the kinetic energy of molecules, and kinetic energy is dependent on velocity.
A solenoid with an iron core is 25 cm long and is wrapped with 100 turns of wire. When the current through the solenoid is 10 A, the magnetic field inside it is 2.0 T. For this current, what is the permeability of the iron
Answer:
A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches. The magnetic field within a solenoid depends upon the current and density of turns.
Explanation:
hope this helped its pretty long
Roughly how long does it take for the sun's light to reach Earth - 8 minutes, 8 hours or 8 days?
Answer:
8 minutes
Explanation:
Light travels at a speed of 299,792
kilometers per second; 186,287 miles
per second. It takes 499.0 second
for light to travel from the Sun to the
Earth, a distance celled 1 Astronomical
Unit.
The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given time is 96.875%. How many half-lives has the sample experienced?
A. 5
B. 4
C. 6
D. 3
I believe it's 4, but I'm not entirely sure.
The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given time is 96.875%. The sample has experienced 5 half lives. The correct option is A.
What is half life?Half life is the time required for the heavy nucleus or any radioactive material to disintegrate by half its quantity.
After one half life, the probability of decay of any nucleus is given by 50%. = 0.5
After two half lives gone, probability of decay is 0.5 + 1/2(0.5) = 0.75
After, three half lives gone, probability of decay is 0.5 + 1/2(0.5) + (1/2)²(0.5) = 0.875
After, four half lives gone, probability of decay is 0.5 + 1/2(0.5) = 0.875 + (1/2)³(0.5) = 0.9375.
After, five half lives gone, probability of decay is 0.9375 + (1/2)⁴(0.5) = 0.96875.
Thus, the sample has experienced 5 half lives. The correct option is A.\
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Levi observed properties of three different waves and recorded observations about each one in his chart. which statement is best supported by the table? wave w and y are light waves. wave x is a sound wave. wave w is a light wave. waves x and y are sound waves. waves y is a sound wave. waves x and w are light waves. wave w is a sound wave. waves x and y are light waves.
For the three different waves observed and recorded, Waves X and Y are light waves. This is further explained below.
What is a wave?Generally, A wave is simply defined as a disturbance that propagates through a medium from one point to another.
In conclusion, Wave Z is impossible to classify, Waves X and Y are light waves, and Wave W is a sound wave.
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Answer:
D
Explanation:
There are pros and cons to both e-readers and paper books. Do you think the pros outweigh the cons more for modern electronic readers, or for good old-fashioned paper books? Maybe it simply comes down to personal preferences as opposed to rational decision-making. Which do you prefer? Which do you think is better? Explain.
E-books have made it easier to carry books across long distances and have made learning simpler.
E-books or paper books?In the twenty first century, we have seen a sudden budding of technology such as have never been. Part of this mordern technology is the introduction of electronic books in several formats such as pdf, epub etc.
These books can be read on computers, ipads, laptops, sart phone etc having the appropriate reader software. These ebooks unlike the paper books have eased the inconvienence associated with carrying paper books which are often bulky from place to place.
Several ebooks could be housed at once in a smartphone and carried in the pocket. This has made learning easier than ever. Thus, ebooks are better than paper books.
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State Newton's law of motion.
Answer:
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
Explanation:
If our planet was twice as far away how would the Earth’s orbit change?
Answer:
One of the indirect proofs that orbits change is actually in the growth of our own teeth when we were children. our teeth are some of the most basic, and primitive
parts of our bodies. They grow on a 9 day cycle, which was an ancient full moon to full moon cycle when the Earth and the Moon were a lot smaller, and closer together, and the co-orbital period was only 9 days, not the 29.5 days that it is currently.
So Given any two " Planets " that co-orbit a common gravitational center, the larger planet will grow larger far faster than the smaller planet, and the larger planet will accelerate the smaller planet to a higher orbit with a longer period, and decelerate itself to a lower orbit with a longer period, and the absolute value of the center to center distance will increase, and the orbital period will increase. The two orbs and their common gravitational center will remain co-linear through out the gradual growing and changing process.
This is an important process for the enlargement of the solar system as time passes, and an important process for larger galaxies as they attract and merge with smaller galaxies.
All of the planets grow larger at an accelerating rate, and thus systems spiral outward concentrating mass into larger and fewer galaxies, solar systems, and planet - moon systems.
A force of 1 N is equal to which combination of SI units?
O A. 1J/m-s2
OB. 1 kg-m/s2
O C. 152-kg/m
D. 1 m/J's
SUBM
Answer:
F = M a = kg * m/s^2
1 N = 1 kg * m/s^2
(B) is correct
