why is no one helping?

Why Is No One Helping?

Answers

Answer 1

Answer:

First one is hyperopia, second is myopia

Explanation:

Hyperopia is when the image is formed behind the retina.

Myopia is when images are formed infront of the retina.

Why Is No One Helping?
Why Is No One Helping?

Related Questions

What is the name of the change in state by which some more energetic molecules in a liquid leave the surface, leaving the rest of the liquid slightly cooler.

Answers

Answer:

evaporation

Explanation:

vapor is having higher temperature (also energy) that the liquid it left behind.

that's why the water vapor leave the surface of water which can only have a maximum temperature as 100°C

The object will feel minimum force of gravity at the

Answers

Answer:

space , small amount of gravity is found in the space ,infact we can say that there is no gravity in the space

Answer:

Poles

Explanation:

The gravitational force is maximum at the equator and minimum at the poles.

The power of a machine is 6000 W. This machine is scheduled for design improvements. Engineers have reduced the
time for the output by one half from 15 s to 7.5 s. What work would be required to cut the time in half.
Step #1
Step #2
Step #3​

Answers

Explanation:

Work = power × time

W = (6000 W) (7.5 s)

W = 45,000 J

A student with a mass of 66.0 kg climbs a staircase in 44.0 s. If the distance between the base and the top of the staircase is 14.0 m, how much power will the student deliver by climbing the stairs

Answers

[tex]power = 205.8 \: watt \\ solution \\ mass = 66 \: kg \\ time = 44 \: sec \\ distance = 14 \\ now \\ power = \frac{w}{t} \\ \: \: \: \: \: \: \: \: = \frac{f \times d}{t} \\ \: \: \: \: \: = \frac{m \times g \times d}{t} \\ \: \: \: \: \: \: = \frac{66 \times 9.8 \times 14}{44} \\ \: \: \: \: = \frac{9055.2}{44} \\ \: \: \: \: \: = 205.8 \: watt \\ hope \: it \: helps[/tex]

A 2kg object is dropped from a height 10m.Calculate the speed of the object after it has fallen 5m, assuming there is no resistance. g= 10 N/kg​

Answers

Answer:

10m/s

Explanation:

[tex]d=v_ot+\dfrac{1}{2}at^2[/tex]

Since there is no initial velocity as the object is dropped, you can write the following equation:

[tex]5=\dfrac{1}{2}(10)t^2 \\\\1=t^2 \\\\t=1[/tex]

Now that you know how long the fall took, you can use another physics equation to find the velocity at that point.

[tex]v_f=v_o+at[/tex]

Since there once again is no initial velocity, you can rewrite this as:

[tex]v_f=at=(10)(1)=10m/s[/tex]

Hope this helps!

The kinetic energy the object has at any point during the fall is exactly the potential energy it lost by falling to that height.

Potential energy = (mass) · (gravity) · (height)

Change of potential energy = (mass) · (gravity) · (change of height)

Change of potential energy = (2 kg) · (10 m/s ) · (-5 m)

Change of potential energy = 100 Joules

Kinetic energy = (1/2) · (mass) · (speed²)

Kinetic energy = (1 kg) · (speed² )

100 J = (1 kg) · (speed²)

Speed² = (100 J) / (1 kg)

Speed² = (100 kg-m²/s²) / (1 kg)

Speed² = (100 m²/s²)

Speed = 10 m/s  

QUICK WILL MARK BRAINLIEST
As light shines from air to water, the index of refraction is 1.02 and the angle of
incidence is 38.0 °. What is the light's angle of refraction?

29.8°
32.5°
37.1°
39.8°

Answers

Answer:

37.1°

Explanation:

An astronaut is moving in space when a big explosion occurs about 50 meters behind him. How will the astronaut come to know about the explosion?
Choose:--
From the sound of the explosion
From the light due to the explosion
From light and sound due to the explosion
From the vibrations due to the explosion

Answers

Answer:

The correct answer is B.

The astronaut will know due to the light from the explosion.

Explanation:

Sound and vibrations require a medium such as air to travel through. Space, there is no air. Only a vacuum. So sound and vibrations are unable to travel. Light requires no medium to travel. It can go through a vacuum.  

Therefore the Astronaut will see a bright flash of light as it travels from the explosion to outer space. It is also important to note that light can travel very far because nothing else interacts with its wave particles and as such, it cannot be impeded.

Cheers!

Write down any four points that should be considered during household wiring

Answers

1. Safety equipment is available
2. Person attempting the task has some general knowledge about wiring
3. Not All Cable is Color-Coded
Cable-sheath color coding started in 2001 and is still voluntary. If you have older wiring, don’t assume it complies with the current color coding. However, most manufacturers now follow the standard color code.
4. Stranded wire is more flexible than solid. If you’re pulling wire through conduit, stranded wire makes it easier to get around corners and bends in the conduit. However, if the situation requires pushing wires through conduit, you’ll want to use solid wire.

Answer:

USE RUBBER CLOVES

USE A PLIER

USE CONDUCTIVE WIRES

SWITHC OFF THE MAIN SWITCH WHILE WIRRING

Explanation:

What is the acceleration if velocity increases from 10 m/s to 15m/s after travelling a distance of 5 metre​

Answers

Answer:

a=1.25m/s²

Explanation:

GIVEN DATA

vi=10m/s

vf=15m/s

S=5m

TO FIND

a=?

SOLUTION

by using third equation of motion

2as=(vf)²-(vi)²

2a(5m)=(15m/s)²-(10m/s)²

10m×a=225m²/s²-100m²/s²

10m×a=125m²/s²

a=[tex]\frac{125}{10}[/tex]

a=12.5m/s²

can someone help what are the common branches of physics

Answers

Answer: Dear Buddy ,the common brnches os physics are given below:

Explanation:

Mechanics

Classical physics

Modern physics

Thermodynamics

Electricity

Magnetism

Geo physics

Plasma physics

Optics

Sound and oscillation

Electronics

Chemical physics

Engineering physics

Solid state physics

Quantum physics

Nuclear physics

Particle physics

Bio physics

Astrophysics

Condensed matter physics

hope it helps

Answer:

Engineering is one of branches that uses physics mainly the most

Explanation:

as for engineering requires mathematics and physics principles in their everyday routine to calculate and measure accordingly to manufactur a product.

What is the most likely reason why these early flowers gradually changed to many different types of flowers over time?

Answers

Answer:

The flowers adapted to environmental conditions.

Explanation:

explain the causes of yaa asantewaa war of 1900​

Answers

Answer: the conflict began when a british representative - Sr. Frederick Mitchell Hodgson sat on the golden stool.

Explanation:

since the stool wasn't a throne, when Yaa Asantewaa found out, he led a rebellion which killed 1000 British and allied African soldiers and 2,000 Ashanti.      

good luck with your assignment :)

calculate the pressure exerted by a man having mass 50 kg standing on one feet having area 500cm2​

Answers

Answer:

9800 Pa

Explanation:

Data: pressure-?

Force- mass ×acceleration

= 50× 9.8m/s^2

=490N

Area= 500cm^2=0.05m^2

pressure= force/ area

p=F/A

P= (490N)/( 0.05m^2)

=9800 Pa

Is a 5kg ball is rolling to the right and has a velocity of 4 m/s what is the momentum of the ball

Answers

Answer:

∆p = 20 kg * m/s

Explanation:

The change in momentum is the mass of the body multiplied by the change in its velocity.

In formula form ∆p = m * ( ∆v ).

with m = 5 kg and ∆v = 4 m/s

∆p = 5 kg * 4 m/s

∆p = 20 kg * m/s

Investigator Robbins is called to the scene of a robbery. The officer on the scene thinks that the suspect entered the home from the garage. As Investigator Robbins checks over the house, he does not find any evidence of forced entry. He cannot find any physical evidence near the garage door at all. There is a window open above the kitchen sink and footprints in the mud under the window outside. Based on his examination, what conclusion might Investigator Robbins make?


1. The officer was correct; the garage was the point of entry.

2. There is no evidence to indicate that anyone entered the home.

3. The officer's conclusion was mistaken, and a suspect may have entered through the window.

4. The garage was the point of entry, but the window was the escape route.

Answers

Answer:

3

Explanation:

Since the evidence found points to the window on investigation remember there was a foot print below the window as well as the window been opened.

a motorcar is moving with a velocity of 108 km / h and it takes 4s to stop after the brakes are applied calculate the force exerted by the brakes on the motorcar if it's mass along with the passengers is 1000 kg​

Answers

Answer: - 7500N

Explanation:

Given the following :

Initial Velocity of car = 108km/hr

Time taken to stop after applying brakes = 4s

Mass of passengers in car = 1000kg

Force exerted by the brakes on the car =?

After 4s, then final Velocity (V) = 0

Initial Velocity (u) of the car = 108km/hr

108km/hr = (108 × 1000)m ÷ (3600)s = 30m/s

Force exerted = mass(m) × acceleration(a)

Acceleration of car = Change in Velocity with time

a = (v - u) / t

a = (0 - 30) / 4

a = - 30/ 4

a = - 7.5m/s^2

Therefore,

Force exerted = mass(m) × acceleration(a)

Force exerted = 1000kg × (-7.5)m/s^2

Force exerted = - 7500N

Answer:

The force exerted by the brakes on the motor car is -7500 N.

Explanation:

Given :-

Mass of the motor car along with passengers (m)= 1000 kgInitial velocity (u) = 108 km/hTime taken (t) = 4 s

To find :-

The force exerted by the brakes on the motor car.

Solution :-

Since the car stops, the final velocity (v) will be 0 m/s.

• Initial velocity (u) = 108 km/h.

Converting initial velocity into m/s.

We know that,[tex] \sf{1\:km/h=\dfrac{5}{18}\:m/s}[/tex]

Then initial velocity,

= [108 × 5/18 ] m/s

= 30 m/s

Now find the force exerted by the brakes.

Formula used :

[tex]{\boxed{\sf{F=\dfrac{m(v-u)}{t}}}}[/tex]

   [put values]

[tex]:\implies \sf \: F= \dfrac{1000(0 - 30)}{ 4} \\ \\ : \implies \sf \: F \: = \dfrac{ - 30000}{4} \\ \\ : \implies \sf \: F \: = - 7500[/tex]

The force exerted by the brakes on the motor car = -7500 N.

•The negative sign of force(F) means that the force was applied in opposite direction of motion.

__________________

If the potential difference across the bulb in a camping lantern is 9.0 V, what is the
potential difference across the cells used to power it?

Answers

Answer:

9.0 V.

Explanation:

battery gives the voltage of 9.0 V to the lantern to use it.

The voltage across the bulb in camping lanterns is equal to the potential difference across the cells that are used to power it. So, 9 V.

What is meant by potential difference ?

Potential difference between two points is defined as the amount of work required to move a unit positive charge along any path between two places in the electric field without accelerating the charge.

Here,

While the one point has a lower potential, the other one has a higher potential. The term voltage or potential difference refers to the charge difference between higher and lower potentials.

The force needed for the electrons to move through a circuit is provided by the voltage or potential difference.

In a series circuit, the voltage across a bulb is equal to the voltage across the battery only if the bulb and the battery are the only components in the circuit.

Hence,

The voltage across the bulb in camping lanterns is equal to the potential difference across the cells that are used to power it. So, 9 V.

To learn more about potential difference, click:

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A wire having resistance 20 ohm is bent to make a closed square.What is the resistance across the diagonal of square?

Answers

Answer:

5 Ω

Explanation:

When it is bent into a square, each side of the square will get 5 Ω resistance. As considered diagonally ,path of the wire between to diagonal points is the two sides of the square (that is half the length of the wire connected in parallel position). Which gives 10 ohm parallel to 10 ohm wire. So it finally read as 5 Ω wire

Chemical potential energy can be released into
energy
OA) heat
OB) elastic
OC) potential​

Answers

The answer is A) heat.

Answer:

C Potential

Explanation:

Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.

what is brightness. help asap

Answers

Answer:

The subjective visual sensation related to the intensity of light emanating from a surface or from a point source.

Salt is dissolved in a flask of tap water . Distilling the mixture causes the salt to separate from the water. Which type of energy is required to begin the distilling process

Answers

I think it’s kinetic energy

A sheet of paper 3.0 cm by 4.0 cm is lying on the desk. If the atmospheric pressure is 1.013105 Pa, what is the total force exerted on the top side of the paper by the atmosphere?

Answers

Answer:

132.56N

Explanation:

Pressure is defined as force per unit area.

Expressed mathematically as;

P = F/A

Where P-pressure

F-force

A-area

From the above formula,

F= P×A

= 1.1013 × 10^5 × (3×4/10000)

= 11.013×12 =132.56N

Note: the unit of measure in cm is converted to m and since 100cm makes 1m for each sides 3cm and 4cm we convert to 'm' by dividing by 100 twice giving division by 10000)

The unit of measure Pa means Pascal and is the same as N/m2


A rubber band that has been stretched has gained ____ energy
OA) heat
OB) kinetic
OC) potential
D) chemical​

Answers

Answer: potential

Explanation:

A train is moving west with an initial velocity of 20m/s accelerates at 4m/s for 10 seconds during this time the train moves a distance ​

Answers

Answer:

400m

Explanation:

From Newton's law of motion;

S = ut + 1/2 at2

Where U is initial velocity

a is acceleration

t is velocity hence;

S is distance covered

S = 20×10 + 1/2 × 4×(10)^2

= 200 + 200 = 400m

Calculate the transfer of energy by a force of 15N when it moves the object by a distance of 5m
a. In the direction of the force

b. In a direction at 60° to the direction of the force


c. At right angles to the force

NEED EXPLAINATION

Answers

Answer:

a) 75 J

b) 37.5 J

c) 0

Explanation:

Work is the force exerted on an object causing it to move, Work is the product of force and displacement. Work is not done if the force and displacement are at right angles to each other. It is given by:

[tex]Work(energy)=Fxcos(\theta)[/tex]

F is the force, x is the displacement and Θ is the angle between force and displacement.

a) Force (F) = 15N and distance (x) = 5. Since it is in the direction of the force, Θ = 0

[tex]Work(energy)=Fxcos(\theta)= 15*5*cos(0)=75J[/tex]

b) Force (F) = 15N and distance (x) = 5.  Θ = 60

[tex]Work(energy)=Fxcos(\theta)= 15*5*cos(60)=37.5J[/tex]

c) Force (F) = 15N and distance (x) = 5.  Θ = 90

[tex]Work(energy)=Fxcos(\theta)= 15*5*cos(90)=0[/tex]

A 2 kg billiard green ball is moving toward the 2 kg white billiard ball on a pool table. The green ball is moving with an initial speed of 4 m/s and the white ball is at rest. The two balls collide and move apart. The white ball moves away from the green ball with a speed of -6 m/s. With what speed does the green ball move away?

Answers

Answer:

10m/s

Explanation:

collisions results in objects sticking together or not sticking together after collision and so they do move with a common velocity or uncommon velocity respectively.

Parameters from the question:

Mass of green billiard balls, m1=2kg

Mass of white billiard balls, m2=2kg

Initial velocity for green billiard balls ,u1=4m/s

Initial velocity for white billiard balls ,u2 = 0m/s( since the body is at rest meaning it wasn't moving)

Final velocity of green billiard ball after collision is,v1= unknown

Final velocity of white green billiard ball after collision is, V2 = -6m/s.

Now from Newton's third law of motion that action and reaction must be equal and opposite;hence change in momentum before collision would be the same after collision since energy is conserved.

Hence,

m1U1 + m2U2 = m1V1 +m2V2

2×4 + 2×0 = 2×V1 + 2× (-6)

8 = 2V1 -12

8+12=2V1

20=2V1

10=V1

V1=10m/s

What is the magnitude of impulse of a 2.7 gram ping pong ball initially moving at 15 m/s, if hit by a ping pong paddle and then moves the opposite direction at 14/ms

Answers

Answer:

impulse = 0.0783 kg.m/s

Explanation:

The impulse is the product of the force and an interval of time. This can be represented in terms of the mass of the body and the change in the velocity of the body in such a time:

[tex]F\Delta t=m\Delta v[/tex] [tex]=|m(v_f-v_i)|[/tex]

m: mass of the body = 2.7gm = 0.0027 kg

vf: final velocity = -14m/s

vi: initial velocity = 15m/s

vf is negative because the direction of the ball is opposite to the initial direction:

[tex]|m(v_f-v_i)|=|(0.0027kg)(-14m/s-15m/s)|=0.0783\frac{kg.m}{s}[/tex]

hence, the impulse of the ping pong ball is 0.0783 kg.m/s

When the kinetic energy of particles in a substance decreases, what also decreases?
93
The size of the particles in the substance.
The number of particles in the substance.
The substance's specific heat.
The substance's temperature.

Answers

Answer: D

The substance's temperature

Explanation:

According to kinetic theory, increase in temperature causes increase in kinetic energy of particles in a system.

When the kinetic energy of particles in a substance decreases, it has nothing to do with the size of the particles and the specific heat capacity of the particles or substance. But it a clear indication that the substance temperature has also decreased.

Answer:

D

Explanation:

a 50.0kg bicyclist on a 10.0kg bicycle speeds up from a 5.00m/s to 10.0m/s

Answers

Answer:

The total kinetic energy before accelerating = 750 JThe total kinetic energy after accelerating = 3,000 JTotal work done = 2,250 J

Explanation:

Given:

Mass of bicyclist = 50 kg

Mass of bicycle = 10 kg

Initial velocity (u) = 5 m/s

Final velocity (v) = 10 m/s

Find:

(a) What was the total kinetic energy before accelerating = ?

(b) What was the total kinetic energy after accelerating = ?

(c) How much work was done to increase the kinetic energy of the bicyclist = ?

Computation:

Total mass (M) = 50 kg + 10 kg = 60 kg

1. The total kinetic energy before accelerating = 1/2[Mu²]

The total kinetic energy before accelerating = 0.5[(60)(5)²]

The total kinetic energy before accelerating = 750 J

2. The total kinetic energy after accelerating = 1/2[Mv²]

The total kinetic energy after accelerating = 0.5[(60)(10)²]

The total kinetic energy after accelerating = 3,000 J

3. Total work done = Δ K.E

Total work done = 3,000 J - 750 J

Total work done = 2,250 J

A horse runs for 15 seconds to the south at a speed of 12 m/s. What is the
displacement of the horse in this time?
A. 180 m south
B. 150 m south
C. 150 m
D. 180 m

Answers

Answer: 180 m south

Explanation:

The displacement of the horse in this time is 180 m south. The correct option is A.

What is displacement?

The displacement is the shortest distance travelled by the particle. It is the vector quantity which re[presents both the magnitude and direction.

Velocity is the time rate of change of displacement with time.

Given is a horse runs for 15 seconds to the south at a speed of 12 m/s. So, the displacement is

Displacement = Speed x Time

Put the values, we get

Displacement = 12 m/s x 15s

                      = 180 m

Thus, the displacement of the horse in this time is 180 m south.

Learn more about displacement.

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Other Questions
The area of a parallelogram is 12 ftsquared and the height is 3 ft. Find the length of the corresponding base. What is the angle relationship shown below?A)CorrespondingB)Same side interiorC)Alternate interiorD)Alternate exteriorE)Vertical Read the excerpt from Mark Twain's "The 1,000,000 Bank-Note".Well, I was perfectly honest and square with her; told her I hadn't a cent in the world but just the million-pound note she'd heard so much talk about, and it didn't belong to me, and that started her curiosity; and then I talked low, and told her the whole history right from the start, and it nearly killed her laughing. What in the nation she could find to laugh about I couldn't see, but there it was; every half-minute some new detail would fetch her, and I would have to stop as much as a minute and a half to give her a chance to settle down again. Why, she laughed herself lame--she did, indeed; I never saw anything like it. I mean I never saw a painful story--a story of a person's troubles and worries and fears--produce just that kind of effect before.Which rhetorical device is demonstrated in the excerpt? Find the surface area of the polyhedra pls!! show how you got the surface area What is the measure of XYZ?please help me out 6. When a positive charge is released and moves along an electric field line, it moves to a position of A) lower potential and lower potential energy. B) lower potential and higher potential energy. C) higher potential and lower potential energy. D) higher potential and higher potential energy. An asset was acquired on September 30, 2021, for $104,000 with an estimated five-year life and $25,000 residual value. The company uses double-declining-balance depreciation. Calculate the gain or loss if the asset was sold on December 31, 2022, for $54,000. Partial-year depreciation is to be calculated. Which one of the following is not equivalent to 2.50 miles? (1.00 mi = 1.61 km = 5280 ft, 1.00 yd = 3.00 ft = 12.0 in.) (A) 1.32 x 104 ft (B) 1.58 x 105 in (C) 4.02 x 103 km (D) 4.40 x 103 yd (E) 4.02 x 105 cm Problem PageQuestion The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of per day. Find the half-life of this substance (that is, the time it takes for one-half the original amount in a given sample of this substance to decay). What is the subject of a memoir? A. an experience or period in the authors life B. a significant historical event C. a fictional adventure story D. an analysis of a certain topic Solve the equation using the Quadratic Formula: *x2 3x + 3 = 5x + 1 translate this latin WITHOUT USING GOOGLE TRANSLATE if you dont know latin dont try it Graec clmbant hosts vict esse; urbem esse suam! The part of the atom involved in chemical bonding is the what How many groups are in the modem periodic table John Locke would have agreed with all of the following statements EXCEPT:A.Government should be accountable to the people it governs.B.A government should protect peoples natural rights to life, liberty, and property.C.A government should have limited power so that it does not infringe on the rights of its citizens.D.Government should have the authority to suppress the will of its citizens if it deems it to be crucial to society. Simplify 1 0 - . can someone please help out plz help ASAP i would thx u alot Read the passages about Esperanza. Select the trait that best describes her during each scene. Isabel handed Esperanza the smelly bundles and said, "Take them to the toilets and dump themand I'll fill the washtub." Esperanza held them at arm's length and almost ran to the toilets. In her entire life, Esperanza had never held a broom in her hand. But she had seen Hortensia sweep and she tried to visualize the memory. It couldn't possibly be that hard. "I said I could work. I told Mama I could help. But I cannot even wash clothes or sweep a floor. Does the whole camp know?" Isabel sat down on the bed next to her and patted her back. "Yes." Esperanza groaned. "I will never be able to show my face." What is one way in which chemistry affects your everyday life?A. Refrigerators use energy more efficiently than they did 10 yearsago.B. Tap water is safe to drink because it is monitored for harmfulsubstances.c. Weather forecasts are now more accurate because of radar.D. Watches are now more accurate because they are digitalized. Under the Articles of Confederation, Congress had no power to: