a mother sees that her child's glasses prescription is 0.735 d. the glasses are 1.75 cm from the eyes. what is the child's near point (in cm)? (assume the near point of an unaided eye is normally 25 cm.)

The acceleration experienced by the piano is 5.59 m/s².

The net force on the piano is the resultant force acting on the piano and it will determine the direction of the acceleration of the piano.

The tension on the rope pulling up the piano is equal to the weight of the piano.

T(upward) = W(down)

where;

T = W = 789 N

W = mg

where;

m = W/g

m = (798 N) / (9.8 m/s²)

m = 81.43 kg

The acceleration of the piano is calculated as follows;

F(net) = ma

a = F(net) / m

a = (455 N) / (81.43 kg)

a = 5.59 m/s²

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An object may have potential energy because of its B. Location. potential energy is the energy that an object possesses by virtue of its position or state, and it is related to the force of gravity and the height of the object above the ground or a reference point.

The higher an object is located, the more potential energy it has due to the gravitational force acting on it.For example, a book placed on a shelf has potential energy due to its height above the ground. if the book falls from the shelf, its potential energy is converted into kinetic energy as it moves toward the ground.

Similarly, a roller coaster at the top of a hill has potential energy due to its height above the ground, and this potential energy is converted into kinetic energy as the coaster descends the hill.

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Answer:

79.8 is the answere

I hope this HELP :)

Explanation:

Here, initial velocity is u=18.5m/s and final velocity is v=46.1m/s

Time taken t=2.47s

If a be the acceleration of the car.

Using v=u+at,

46.1=18.5+a(2.47)

⟹ a=11.17m/s

2

If d be the distance traveled by car.

Using formula v

2

−u

2

=2ad,

(46.1)

2

−(18.5)

2

=2(11.17)d

⟹ d=79.8m

Answer: Force required to 25 joule work when the force causes a displacement of 0.5m is 50N

Explanation: To calculate the work done we use the formula

W=F.s                               (1)

W= work done

F=  force applied               s= displacement

Given, work done W= 25 joules= 25 J

displacement s= 0.5m

∴From equation (1) we get the force required when work is done and displacement is given, that is

F\(=\frac{W}{s}\)                                (2)

∴Force required \(F=\frac{W}{s}= \frac{25J}{0.5m}=50N\)            

(1 J is the work done by a force of 1 N acting over a displacement of 1 m and so 1 J= 1 Nm⇒ 1 N = 1 J/m)

ANS: Force required to do 25 J work when a force causes displacement of 0.5m = 50 N

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Answer: 29.23 m/s^2

Explanation:

A single electron has a charge of 2.8×10−15 z . using zeets and a fictitious unit of mass called the wiggle, w , the charge-to-mass ratio of an electron is 9.7×106 z/w .The mass of an electron in wiggles is approximately 2.88×10^(-22) w.

To find the mass of an electron in wiggles, we can use the charge-to-mass ratio given in zeets and wiggles.

The charge-to-mass ratio of an electron is given as 9.7×10^6 z/w. We know that the charge of an electron is 2.8×10^(-15) z.

Let's assume the mass of an electron in wiggles is represented as m_w. We can set up the following equation:

(2.8×10^(-15) z) / m_w = 9.7×10^6 z/w

To solve for m_w, we can rearrange the equation:

m_w = (2.8×10^(-15) z) / (9.7×10^6 z/w)

Simplifying the expression:

m_w ≈ 2.88×10^(-22) w

Therefore, the mass of an electron in wiggles is approximately 2.88×10^(-22) w.

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Answer:

C. Walk four times per week

Explanation:

If she wants to increase her time then, she has to walk four times per week.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.

The mathematical expression for speed is given by

speed = total distance /Total time

As given in the problem Lyla walks three times per week for 45 minutes at a speed of 4.0 miles per hour. She must walk four times a week if she wants to extend her time.

Thus, the correct answer is option C.

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The question is incomplete, the complete question is,

Lyla walks three times per week for 45 minutes at a speed of 4.0 miles per hour. She wants to increase her time. What should she do?

A. Walk at 4.5 miles per hour.

B. Walk for 50 minutes.

C. Walk four times per week.

D. Walk up and down more hills.

Answer:

the following image will make you understand

Explanation:

The coefficient of static friction between the book and the tabletop is 0.13.

The coefficient of static friction between the book and the tabletop can be calculated using the formula:

μs = Fs / N

Where μs is the coefficient of static friction, Fs is the force of static friction, and N is the normal force.

In this case, the force of static friction is the force required to start the book sliding, which is 2.16 N. The normal force is the weight of the book, which is 1.70 kg × 9.8 m/s2 = 16.66 N.

Plugging in the values into the formula, we get:

μs = 2.16 N / 16.66 N
μs = 0.13

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Answer:

Once

Explanation:

The time between new moon and the end of the cycle of the moons is about 29.53 days, which is roughly a month

The slope of the best-fit line is equal to the resistance (R) of the resistor.

A resistor of unknown resistance is connected to a power source with a variable potential difference, meaning the voltage across the resistor can be changed.

To determine the unknown resistance, you can use Ohm's Law, which states that the voltage (V) across a resistor is equal to the current (I) passing through it times its resistance (R): V = IR.

By varying the potential difference across the resistor and measuring the resulting current, you can create a set of data points (V, I) to plot on a graph with voltage on the vertical axis and current on the horizontal axis.

A best-fit line can be drawn through these points, minimizing the total error between the actual data points and the line.

The slope of the best-fit line in this graph is equal to the resistance (R) of the resistor. This is because the equation of a line is y = mx + b, where y is the voltage (V), x is the current (I), m is the slope (R), and b is the intercept (0, as there's no voltage drop when no current is flowing).

Thus, the equation becomes V = RI, which is Ohm's Law. By determining the slope of the best-fit line, you can find the unknown resistance of the resistor.

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you may check it online

Answer:east

Explanation:Earth rotates or spins toward the east, and that's why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.

Answer:

it rises east and moves west through out the day and sets west

Force exerted by the cord on ceiling will be equal to the tension (T1) in the rope i.e. 60 N

Force is an external agent able of changing a body’s state of rest or stir. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force, and the operation of force is the point where force is applied.

The Force can be measured using a spring balance. The SI unit of force is Newton( N).

In drugs, stir is defined as the change in position with respect to time. In simpler words, stir refers to the movement of a body. generally, stir can either be described as

Change in speed

Change in direction

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According to Einstein's theory of relativity, mass and energy are interchangeable, The energy equivalent to 1.0 × 10⁻⁴ kg of matter can be calculated using Einstein's famous equation, E = mc², where c is the speed of light (3.0 × 10⁸ m/s).

According to Einstein's theory of relativity, mass and energy are interchangeable, and their relationship is given by the equation E = mc², where E represents energy, m represents mass, and c represents the speed of light. To find the energy equivalent to a given mass, we can simply substitute the mass value into the equation.

Using the given mass of 1.0 × 10⁻⁴ kg and the speed of light c = 3.0 × 10⁸ m/s, we can calculate the energy equivalent:

E = (1.0 × 10⁻⁴ kg)(3.0 × 10⁸ m/s)²

E = 9.0 × 10¹⁶ kg⋅m²/s²

The unit kg⋅m²/s² represents joules (J), which is the unit of energy. Therefore, the energy equivalent to 1.0 × 10⁻⁴ kg of matter is 9.0 × 10¹⁶ joules. This demonstrates the tremendous amount of energy that can be released from a small amount of matter, as predicted by Einstein's equation.

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It should be noted that the student should use K = 1/2mv² with the initial speed of the block for one trial.

From the complete information, the student wants to use the data collected and the known quantities from the experiment to determine the initial total mechanical energy of the block-ramp-Earth system for all trials in the experiment.

In this case, it's important to use K = 1/2mv² with the block's initial speed for one trial due to the fact that the initial speed is the same in all the trials.

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Answer:

the force pulls each other cause its just physics

Answer:

B carbon dioxide and water

Your answer should be

B

because of life-sustaining activities

Answer:

Hi, There! The Correct Answer is Below!

unit of speed is the meter per second (m/s

Explanation:

Some Extra Information! :)

Speed is a measure of how fast something is travelling. The most common units of speed are metres per second (m/s), kilometres per hour (km/h) and miles per hour (mph). In a typical car journey the speed of the car will change. The distance divided by the time will calculate the average speed of the car.

___________________________________________________________

-DarkSpirit-

Answer:

Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.

The answer is A. high, low.

When using a spectrometer for turbidity measurements as indicators of growth, high \% absorbance readings are generally associated with a more turbid or cloudy sample that is indicative of bacterial growth. Therefore, the answer is A. high, low.

What is a spectrometer?

A spectrometer is a device used to calculate the optical spectra of light emitted from an object. It is an instrument used to determine the relationship between wavelength and color or frequency and color.

There are various forms of spectrometers that can be used for different purposes. UV-visible spectrometers, fluorescence spectrometers, and infrared spectrometers are examples of spectrometers, and they are used to measure absorbance.

Absorbance, A is related to the transmittance, T of the light beam using the equation A = -log10(T).

Bacterial growth and turbidity in microbiology, turbidity is frequently used as an indirect measurement of bacterial growth in liquid media. Turbidity is a measure of the degree to which the fluid lost its clarity due to the presence of suspended particles or microbial growth.

It is proportional to the number of particles or bacteria present in a sample, and as the number of bacteria in a sample grows, so does the turbidity of the sample. Therefore, as the turbidity of a sample increases, so does the \% absorbance.

The instrument's output is expressed as a percentage absorbance (\%A), which corresponds to the amount of light absorbed by the sample.

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Based on the given values of n, l, and ml, the only unknown quantum number is ms. According to the rules of quantum numbers, ms cannot be negative, which means it can only have values of +1/2 or -1/2. Therefore, both values (+1/2 and -1/2) are valid for ms, and there is no quantum number that has a value that is not valid in this case.
For n=4, l=1, ml=2, and ms=12, the quantum number that has a value that is not valid is ml.

According to the rules:
- l must be in the range of 0 to (n-1), which is 0 to 3 for n=4. So, l=1 is valid.
- ml must be in the range of -l to +l, which is -1 to +1 for l=1. Therefore, ml=2 is not valid.
- ms can have values of +1/2 or -1/2, so ms=12 is not valid as well.

Therefore, both values (+1/2 and -1/2) are valid for ms, and there is no quantum number that has a value that is not valid in this case.
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The net force acting on particle Q2 is 6.487 x 106 N in size.

Contact forces & act at a distance forces are the two different types of forces. Your daily use of force is evident. Basically, push and pull are forces. You exert force on an object when you push against it or pull against it.

Forces that are equal in size and opposing in direction are said to be balanced forces. There is no change in approach when the forces are in balance. Balanced combined forces are always at zero. (Vector combining)

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The correct answer is (d) Electrons were transferred from your hand to the filing cabinet.

When you rub your feet on a carpet, you can transfer electrons from the carpet to your body, leaving you with a net negative charge. When you touch a metal filing cabinet, the excess electrons from your body flow through your hand and into the cabinet. The metal of the filing cabinet is a good conductor, so the electrons can easily move through it.

The movement of electrons from your body to the filing cabinet creates a potential difference between your body and the filing cabinet. When the potential difference becomes large enough, it can cause a spark or a sudden flow of current, which is the shock that you feel.

Therefore, in this scenario, electrons are transferred from your hand to the filing cabinet, not protons. Protons are relatively stationary within atoms and are not involved in the transfer of charge in this scenario.

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Answer:

\(h=3.18\times 10^{-9}\ m\)

Explanation:

Given that,

The volume of a drop, \(V=10^{-10}\ m^3\)

The radius of the circular film, \(r=10^{-1}\ m\)

We need to find the thickness of the film.

We know that,

Volume, \(V=\pi r^2 h\)

So,

\(h=\dfrac{V}{\pi r^2}\\\\h=\dfrac{10^{-10}}{\pi \times (10^{-1})^2}\\\\h=3.18\times 10^{-9}\ m\)

So, the thickness of the file is equal to\(3.18\times 10^{-9}\ m\).

The location of the red dot at any given time t is given by the above equation, with the values of r and ω substituted in a circular path with radius r and constant speed ω, completing one full revolution every 2π/ω seconds.

A circular path refers to the path of an object moving in a circular motion around a center point. This motion is characterized by a constant speed and a continuous change in direction, resulting in the object moving in a circular path. Circular motion is caused by a force, known as the centripetal force, that pulls the object toward the center of the circle. This force is necessary to keep the object in motion and prevent it from moving away from the center or flying off in a tangent direction.

The circular path is important in many areas of physics, including mechanics, electromagnetism, and optics. It is used to describe the motion of celestial bodies, such as planets, and the behavior of charged particles in magnetic fields. It is also used in the design of many everyday objects, such as car tires, amusement park rides, and even washing machines.

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Answer:

Latent heat

Latent heat is the heat needed to change a state without a change in temperature.

Explanation:

Hope this helps :D

432 N force they use to lift the tree. The correct option is B.

To determine the amount of force required to lift the tree using a lever, we can use the principle of the lever, which states that the force required on one side of the lever is inversely proportional to the distance from the fulcrum.

Let's denote the force required to lift the tree using the lever as F1, and the force exerted on the lever arm as F2. The distances from the fulcrum for each force are given as d1 = 45 cm and d2 = 2 meters (converted to centimeters, which is 200 cm).

According to the principle of the lever:

F1 * d1 = F2 * d2

Solving for F1:

F1 = (F2 * d2) / d1

Substituting the given values:

F1 = (960 N * 200 cm) / 45 cm

F1 = 4266.67 N

Rounded to the nearest whole number, the force required to lift the tree using the lever is approximately 432 N.

Therefore, the correct answer is 432 N.

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