How much energy is required to move 2 electrons through a potential difference of 1.0 x 10^ 2 volts?

Calculate the focal length of a lens needed by a woman whose near point is 50cm from her eyes, assuming the least distance of di

son4ous [18]

The focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.

To find the answer, we have to know about the focal length of correcting lens.

<h3>How to find the focal length of correcting lens?</h3>

If x is the distance of nearest point of the defective eye and D is the least distance of distinct vision, then, the expression for focal length of the correcting lens will be,

$f=\frac{XD}{X-D}$

It is given that, the woman whose near point is 50cm from her eyes, assuming the least distance of distinct vision for a normal eye is 25cm. Thus, the focal length will be,

$f=\frac{50*25}{50-25} =50cm.$

Thus, we can conclude that, the focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.

Learn more about the focal length here:

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4 0

2 years ago

1. During mitosis, the genetic material in a cell is replicated, and then the cell splits into two new cells. The two new cells

DENIUS [597]

<h2>Answer:</h2><h3>Part 1.</h3>

The correct option is the option C which is all cells come from the pre-existing cells.

Explanation:

Mitosis is the cell division in which one cell divides into two identical cells having same number of chromosomes.

So a cell divide into two giving two cells which further divides.

Even a whole organism come from the division of single cell which is made from the combination of an egg and sperm.

The correct option is the option A which is gene.

Explanation:

DNA contains all the information necessary for a whole organism.

A gene is the unit of DNA which describes a single trait.

For example gene of eye color and gene for insulin production.

So the gene is exact answer to this question while proteins and phenotype are less relevant to question.

Graphs are not given in this question but a graph Will be hyperbola type of inversely proportional. The line in graph descends.

Explanation:

If distance square is on x axis and intensity of light on y axis, The line will move from upward to lower direction.

In the graph at initial distance means low square of distance the intensity will be high and as the square distance increases the intensity will become low.

The line on the graph will descends as the distance square on x axis increases.

The correct answer will be option B.

Explanation:

The process of generating sugar from the carbon dioxide and water in the presence of light and green pigment chlorophyll is known as the photosynthesis.
It occurs mostly in leaves off plants.
While respiration is the breakdown of food generating energy.
And digestion is simplification of complex molecules and osmosis is the transport of water across membrane.
Hence photosynthesis is the correct answer.

The correct answer is the option D which is the population of frogs and mice would increase which would cause the population of grasshoppers to decrease.

Explanation:

Snake is the tertiary consumer in a food web and frogs and mice are secondary consumer while grasshopper is the primary consumer.

As the snake is removed from the food web the population of frogs and mice will increase due to the less pray of secondary consumers.

As frog and mice will increased they will eat more grasshopper making decrease in grasshopper population.

The correct answer is the option B which is the volume of block B is more than A.

Explanation:

The rate of sinking depends upon the density of blocks.

As we know both blocks sink at the same rate. Hence both blocks have same density.

Now the mass measured of block B is more than block A.

But their mass to volume ratio is same. So it means block B has more mass with more volume making density equal to block A.

The correct answer is the option B which is the solution is the base.

Explanation:

Litmus papers are indicators that are used to know the pH of a solution.
They change color as the indication of acidic or basic solution.
A red litmus paper turns into blue when the solution is basic.
A blue litmus paper turns red under acidic solution.

<u>In this question the red litmus changes color to blue it means solution would be basic or alkaline.</u>

The correct answer of this question is the option D which is insulin maintain the homeostasis within the body system.

Explanation:

Homeostasis is body's condition in internal equilibrium. It actually maintains the body in internal condition into dynamic equilibrium.

As the concentration of glucose increases the insulin lowers it. And as the glucose level concentration becomes too low then an hormone known as glycogen is release by pancreas which increases the glucose level in blood.

Hence all mechanism of insulin is to maintain the homeostasis in body.

The correct option is A.

Explanation:

A chemical compound is the combination of two or more than two different elements forming a stable compound.
While an element is the combination of 2 or more than 2 same atoms.
Atoms form elements and elements forms the compounds.
For example C6H12O6 is a chemical compound made from 3 types of elements.
While H2 is an elements.

The option B is the correct option. Jupiter has shortest day in given planets.

Explanation:

The time period of a day of a planet depends upon its rotation around its axis.
A planet with shortest time period of rotation around its axis will have shortest day.
The Jupiter has shortest day. Its spinning time around its axis is 9 hr 55 min 29.69 sec.
It is because Jupiter has small axial tilt of only 3.13 degrees.

8 0

4 years ago

Read 2 more answers

The Astronomer Carl Sagan is famous. Why?

Zolol [24]

Mainly because he was Johnny Carson's advisor and consultant
on space, astronomy, and science in general, and he appeared
on The Tonight Show Starring Johnny Carson many times.

6 0

3 years ago

If the car has the same initial velocity, and if the driver slams on the brakes at the same distance from the tree, then what wo

Elena L [17]

Answer: The question is incomplete or some details are missing. Here is the complete question ; (a) The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration of −5.55 m/s2 for 4.05 s, making straight skid marks 63.0 m long, all the way to the tree. With what speed (in m/s) does the car then strike the tree? m/s

(b) What If? If the car has the same initial velocity, and if the driver slams on the brakes at the same distance from the tree, then what would the acceleration need to be (in m/s2) so that the car narrowly avoids a collision? m/s2

a ) With what speed (in m/s) does the car then strike the tree? m/s = 4.3125m/s

b) then what would the acceleration need to be (in m/s2) so that the car narrowly avoids a collision? m/s2 = -5.696m/s2

Explanation:

The detailed steps and calculation is as shown in the attached file.

6 0

4 years ago

If a rock is thrown upward on the planet Mars with a velocity of 10 ms, its height in meters seconds later is given by (a) Find

Delicious77 [7]

Answer:

$1) X(t)=Xo+So(t)+\frac{1}{2} g(t)^{2}$

2) S(Δt)=So+g(Δt)

Explanation:

I think the equation they gave you for the Height upon time in seconds it's (1), where if you see, you will find the gravity, that you should multiply by 2 because, its divided by two in (1) (that should be your (a)), then, once you find your gravity, you can use the equation (2) to know the Final Speed replacing g , at the time asked, remember that g is gravity, and Δt is the: final time- initial time.

so in the [1,2] interval of time, your Δt=1s, and in [1,1.5] is Δt=0,5s.

i hoped it helped you even though i cant give you the exact answer right now.

6 0

4 years ago