a pharmacy student has eyes who have a relaxed refractive power of 45.5 diopters and her retina is 2.4 cm from her lens. 1)is she nearsighted or farsighted? (1) nearsighted (2) farsighted 1 type in the number that corresponds to your answer your submissions: 1 computed value:1 submitted:friday, april 14 at 10:46 pm feedback:correct! 2)if she is nearsighted, what is her far point? if she is far-sighted, what is her near-point? m 3)let's say she wants to be able to focus clearly on objects that are from 225 m to 6 cm away. what is the power of the corrective lens she should wear assuming her glasses are 2 cm from her eye? corrective power

A spring that obeys Hooke's Law has an unstretched length of 10 cm. A load of 20 N is hung from the spring. The new length of the spring is 36 cm, then the spring constant k of the spring would be 0.77 N/ cm.

The spring constant is used to define the stiffness of the spring, the greater the value of the spring constant stiffer the spring and it is more difficult to stretch the spring.

Relation between force and the spring constant,

F = - Kx

F= 20 N and

x = 36 -10

  = 26 cm

K = F/x

  =20/26 N/ cm

  =0.77 N / cm

Thus, the spring constant for the spring is 0.77 N/ cm, therefore the correct answer is option B.

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The statements which describe some of the original ideas proposed about the universe during the big bang include:

This is the theory about the formation of the universe which states that a single point began to expand which resulted in its formation.

This was as a result of observations and ideas which can be seen mentioned above.

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Answer:

B. The universe was opaque.

D. The universe was very hot and dense.

E. The universe expanded from a single point.

Explanation:

Answer:

gravity

Explanation:

Answer: gravity

Explanation: Newton's revolutionary idea was that gravity is universal - ALL objects attract in proportion to the product of their masses. Gravity is universal.

10.72 m/s^2 is the greatest acceleration that the workers can give the bucket as they pull it to the roof.

acceleration is the speed and direction change over time of a moving object. When anything moves faster or slower, it is said to be accelerating or decelerating in a straight line. Because the direction is always changing, travel on a circle accelerates even while the speed is constant.

According to Newton's second law of motion, the acceleration of an object is defined as the net force applied divided by its mass, or a = F m. This equation for acceleration can be used to calculate an object's acceleration when its mass and the net force acting on it are known.

Given,

force = 450N

mass = 42kg

acceleration = ?

a = f/m is acceleration formula.

a = 450 / 42  = 10.72 m/s^2

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Answer:

Electromagnetic cranes are used to separate copper from iron in a scrap yard. The current is switched on to energies the electromagnet and pick up the iron pieces from the scrap. Then these iron pieces are moved to another position, the electromagnet in switched off and the iron pieces are released.

Explanation:

Answer:

B

Explanation:

Nonmetal is better insulator than metals

Answer:

B

Explanation:

Just took the quiz.

Simply put, no. Try not to be hard on you if this is the first time you've heard it; in some cases, a belief was once accurate. A bulk of energy storage units kept in fridge are basic AA, AAA, C, & D batteries.

There are three main battery kinds that may be used by consumers. They are lithium ion, nickel metal hydride, and alkaline. Each kind has benefits and drawbacks. Each of them has a unique position in the history of technology.

With the greatest energy density of just about any battery cell, lithium batteries are made of this very light metal. As a result, they have a higher energy capacity than battery systems or any other separate bat of a similar size. Additionally, they work admirably in the both cold and warm environments.

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To calculate the number of electrons that pass through the DVD player in one minute, we first need to determine the total charge that passes through the player in that time. This can be calculated using the formula:

charge = current x time

where the current is given as 0.27 A and the time is 1 minute (or 60 seconds). Substituting these values into the formula, we get:

charge = 0.27 A x 60 s = 16.2 C

where C stands for Coulombs, the unit of electric charge.

To convert this charge to the number of electrons, we need to use the elementary charge, which is the charge carried by a single electron, and is approximately equal to 1.602 x 10^-19 Coulombs. Therefore, the number of electrons passing through the DVD player in one minute can be calculated as:

number of electrons = charge / elementary charge

Substituting the values, we get:

number of electrons = 16.2 C / (1.602 x 10^-19 C) = 1.01 x 10^20 electrons

Therefore, approximately 1.01 x 10^20 electrons pass through the DVD player in one minute.

They are one of the fundamental particles that make up atoms, along with protons and neutrons. Electrons orbit the nucleus of an atom in shells or energy levels, and they are responsible for the chemical and electrical properties of matter.

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Answer:

answer is Heating

Explanation:

take a solid and heat it it will become a liquid

A force of approximately 196.95 Newtons must be exerted on the master cylinder of the hydraulic lift to support the weight of the car on the slave cylinder.

To determine the force required to support the weight of the car on the master cylinder of a hydraulic lift, we can use Pascal's principle, which states that the pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and the walls of its container.

We can start by calculating the force exerted by the car on the slave cylinder, using the formula:

Force_slave = weight_of_car

The weight of the car can be calculated using the formula:

weight_of_car = mass_of_car × gravitational_acceleration

Given that the mass of the car is 2300 kg and the gravitational acceleration is approximately 9.8 m/s^2, we can calculate:

weight_of_car = 2300 kg × 9.8 m/s^2 = 22,540 N

Now, we can use Pascal's principle to determine the force required on the master cylinder. The pressure in the hydraulic system is the same in both the master and slave cylinders. We can calculate the pressure in the system using the formula:

Pressure = Force / Area

Since the area is directly proportional to the square of the diameter, we can use the following relationship:

(Area_slave / Area_master) = (diameter_slave^2 / diameter_master^2)

Plugging in the values given:

(Area_slave / Area_master) = (24.0 cm)^2 / (2.10 cm)^2 = 114.49

Now, we can determine the force on the master cylinder using the formula:

Force_master = Pressure × Area_master

Rearranging the formula, we have:

Force_master = Force_slave × (Area_master / Area_slave)

Substituting the values we've calculated:

Force_master = 22,540 N × (1 / 114.49) = 196.95 N

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1. The statement, specific heat capacity is the amount of heat per unit mass required to raise the temperature of a substance by one Kelvin is true. 2. The statement, substance with the smaller specific heat capacity requires less energy to raise its temperature by 1°C is true. 3. Calorimeter is used to measure the heat generated or consumed by a substance during a chemical reaction or physical change.

Specific heat capacity is the quantity of heat energy required to increase the temperature of a given substance by one unit per unit mass. It characterizes the substance's resistance to temperature changes when heat is added or removed. Thus, the accurate statement is that, specific heat capacity represents the amount of heat per unit mass needed to raise the substance's temperature by one Kelvin or one degree Celsius.   The specific heat capacity of a substance determines the energy required to raise its temperature.

When comparing two substances with the same mass but different specific heat capacities, the substance with the lower specific heat capacity necessitates less energy to increase its temperature by 1°C. Thus, the accurate statement is that, the substance with the smaller specific heat capacity requires less energy to raise its temperature by 1°C. A calorimeter is an instrument utilized to measure the heat generated or absorbed during a chemical reaction or physical change.  Its purpose is to prevent heat exchange with the surroundings, enabling accurate heat measurements. Thus, the accurate statement is that, the heat generated or consumed by a substance during a chemical reaction or physical change.                                                                                        

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The average speed Alan must travel at for the rest of the journey is 96 km/h.

The given parameters;

The first distance traveled by Alan is calculated as;

\(d_1 = 64 \ km/h \times 4.25 \ h\\\\d_1 = 272 \ km\)

The total distance traveled by Alan is calculated as;

\(\frac{1}{4} \times \ total \ distance = 272 \ km\\\\ total \ distance = 4 \times 272 \ km\\\\ total \ distance = 1,088 \ km\)

The distance traveled by Alan in the second journey is calculated as;

\(d_2 = \frac{3}{4} \times 1,088 \ km = 816 \ km\)

The time of motion for the second journey is calculated as;

\(t_2 = T- t_1\\\\t_2 = 12.75 \ hr - 4.25 \ hr\\\\t_2 = 8.5 \ hr\)

The average speed of Alan in the second journey is calculated as;

\(V = \frac{distance}{time} \\\\V = \frac{816 \ km}{8.5 \ h} = 96 \ km/h\)

Thus, the average speed Alan must travel at for the rest of the journey is 96 km/h.

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The given statement " in a core-collapse supernova, outer part of the core rebounds from the inner, high-density core, destroying the entire outer part of  star. " is True. Because, In a core-collapse supernova, the outer part of star's core rebounds after it collapses inward due to the force of gravity.

This rebound creates a powerful shock wave that travels outward and collides with the outer layers of star, causing them to explode outward in a catastrophic event. The energy released in this explosion can be as much as ten times mass-energy of the Sun, making core-collapse supernovae one of the most energetic events in the universe. The high density and temperature of the inner core are not affected by the explosion .

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Answer:

D

Explanation:

An object which starts from its resting place & accelerates at a speed of 4 rad/sec², the angular displacement is 8 rad.

An object's angular displacement is described in the following:

Angle displacement is equal to θ\(f\)-θ\(i\).

The following methodology must also be applied to determine angular displacement when the object's acceleration, starting velocity, and time are known:

θ=ωt+ 1/2αt²

[where θ= the angular displacement of an object,

ω= initial angular velocity,

α= angular acceleration,

t= time]

In this case, the object starts from the rest position.

So, the initial angular speed, ω= 0 rad/sec

Provided angular acceleration ,α = 4 rad/sec²

Time ,t= 4 sec

So, θ= \(0*4+ (1/2)*4*4\)

⇒θ= 0+ 8

⇒θ= 8 rad

Therefore, it is concluded that the angular displacement is 8 rad.

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We can determine the time period of oscillation of a known mass using a light spring and a meter scale without the use of a clock.

To find the time period of oscillation of a known mass using a light spring and a meter scale without the use of a clock, we can follow these steps:

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Answer:Single-Replacement, synthesis, decomposition, combustion.

Explanation:

Had to get it wrong to find out

Redox reactions include Single-replacement, synthesis, decomposition, composition Reactions. Hence option B is correct.

Redox reaction is type of reaction in which oxidation number participating molecules changes. Redox reaction involves two types of the reaction oxidation and reduction. these two reaction take place simultaneous. Oxidation is the loss of electrons and reduction is the gain of electrons.

Oxidation is nothing but addition of oxygen and loss of hydrogen and reduction is loss of oxygen and gain of hydrogen.

Redox reactions include Single-replacement, synthesis, decomposition, composition Reactions.

The oxidation half-reaction is: H₂ → 2H⁺ + 2e⁻

The reduction half-reaction is: F₂ + 2e⁻ → 2F⁻

Hence option B is correct.

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The microscope has two sets of lenses, one in the eyepiece and one in the objective lens. The amount of light is changed by adjusting the diaphragm of the microscope. The diaphragm controls the amount of light that passes through the stage and is focused on the object being viewed.

There are two types of diaphragms in a microscope: the iris diaphragm and the disk diaphragm. The iris diaphragm is adjustable, while the disk diaphragm is preset. The iris diaphragm is located near the base of the microscope and can be adjusted to control the amount of light that enters the microscope. It works like a camera aperture, opening or closing to let in more or less light. When the iris diaphragm is closed, less light enters the microscope, and the image appears darker.

When the iris diaphragm is open, more light enters the microscope, and the image appears brighter. By adjusting the iris diaphragm, you can get the best possible image of the object being viewed. To summarize, the diaphragm is the part of the microscope that you adjust to change the amount of light. The iris diaphragm is adjustable, while the disk diaphragm is preset. By adjusting the diaphragm, you can get the best possible image of the object being viewed.

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Answer:

its false

Explanation:

because Longitudinal waves are in which particles of the medium move directio ni. parallel to the energy transport.

I think this is ur answer

when you carry the 2 and add the 3 its Z

There are several barriers that prevent energy efficiency from reaching its full potential. These barriers include upfront costs, lack of information and awareness, split incentives, market failures, and policy and regulatory challenges.

1. Upfront Costs: Investing in energy-efficient technologies and systems often requires a significant upfront investment. Many individuals and businesses may be hesitant to incur these costs, especially if they have limited financial resources or short-term perspectives.

2. Lack of Information and Awareness: Limited knowledge about energy-efficient practices and technologies can hinder adoption. People may not be aware of the potential energy savings or the available options to improve efficiency.

3. Split Incentives: In situations where landlords own the buildings but tenants pay the energy bills, there is a split incentive problem. Landlords may have little motivation to invest in energy efficiency measures since they don't directly benefit from the reduced energy costs.

4. Market Failures: Market failures, such as information asymmetry and externalities, can impede energy efficiency. For example, consumers may not have access to accurate information about the energy efficiency of products or may not consider the long-term cost savings.

5. Policy and Regulatory Challenges: Inconsistent or inadequate policies and regulations can hinder energy efficiency efforts. Insufficient incentives, lack of enforcement, and complicated procedures for accessing incentives or grants can discourage investment in energy efficiency.

Overcoming these barriers requires a multi-faceted approach involving public awareness campaigns, financial incentives, targeted policies, and streamlined regulations. Governments, businesses, and individuals need to collaborate to address these barriers and unlock the full potential of energy efficiency, leading to significant energy savings and environmental benefits.

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The velocity of car a as described by the passengers in car b is 22.86 m/s in a direction of 34.99° south of east.

To find the velocity of car a as perceived by the passengers in car b, we need to combine the velocities of both cars using vector addition. We can use the Pythagorean theorem to find the magnitude of the resulting velocity and trigonometry to determine its direction.

The magnitude of the resulting velocity can be found using the formula:

resultant velocity = √(velocity a² + velocity b²)

Substituting the values:

resultant velocity = √((20 m/s)² + (17 m/s)²)

= √(400 m²/s² + 289 m²/s²)

= √(689 m²/s²)

≈ 26.23 m/s

To determine the direction, we can use the inverse tangent (arctan) function:

θ = arctan(velocity b / velocity a)

Substituting the values:

θ = arctan(17 m/s / 20 m/s)

= arctan(0.85)

≈ 41.19°

However, since car b is traveling east, we need to subtract this angle from 90° to obtain the angle relative to the east direction:

θ' = 90° - θ

= 90° - 41.19°

≈ 48.81°

Finally, the direction is south of east, so the velocity of car a as described by the passengers in car b is 26.23 m/s at an angle of 48.81° south of east.

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The relative velocity of car A as seen by passengers in car B is 26.2 m/s towards South-East.

The question is based on the concept of relative velocity in physics. When two objects are in motion, the velocity of one object as observed from the other object is called relative velocity. So, the velocity of car A as described by the passengers in car B would take into consideration not only car A's velocity but also car B's velocity.

If we assume east as the positive x-direction and south as the negative y-direction, car A has a velocity of -20 m/s (going south) and car B has a velocity of +17 m/s (going east). For passengers in car B, they're stationary relative to their own car, so car A's motion is considered. But it's moving south (opposite direction of car B), so it seems to them as if it is moving faster, thus, the relative velocity will be the vector sum of car A and car B's velocity.

Using Pythagoras theorem, we can calculate it as follows:
relative velocity = √((velocity of A)² + (velocity of B)²)
relative velocity = √((-20 m/s)² + (-17 m/s)²)
relative velocity = 26.2 m/s towards South-East.

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you may check it online

Answer: The answer is D.

Explanation:

The way A is shooting arrows away means its a negative current. On the other hand B is taking them in making B positive. and that's why the answer is D.

The given problem involves calculating the definite integral of a function f(x) over a specific range. The function f(x) is defined differently for different values of x, and the final result of the definite integral \(1^2\)₁ f(x) dx, where x ≤ n, is -cos(n) - (-cos(1)) + 3cos(T) - 3cos(n) + infinity.

To calculate the definite integral 1²₁ f(x) dx, where x ≤ n, we need to evaluate the integral of the given function f(x) over the specified range. The function f(x) has different definitions depending on the value of x. For x ≤ n, the function is sin(x), and for x > n, the function is -3sin(x). Additionally, the function is defined as 2x for values of x greater than a certain threshold T.

To solve this problem, we need to consider the different intervals of the range separately. First, we integrate sin(x) over the interval 1 to n. The integral of sin(x) is -cos(x), so the value of this part of the integral becomes -cos(n) - (-cos(1)).

Next, we need to integrate -3sin(x) over the interval n to T. The integral of -3sin(x) is 3cos(x), so this part of the integral becomes 3cos(T) - 3cos(n).

Lastly, we integrate 2x over the interval T to infinity. The integral of 2x is \(x^2\), so this part of the integral becomes infinity.

Combining these three parts, the final result of the definite integral \(1^2\)₁ f(x) dx, where x ≤ n, is -cos(n) - (-cos(1)) + 3cos(T) - 3cos(n) + infinity.

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Answer:

The volume of water in the graduated cylinder will be equal to the calculated volume of the sphere.

Explanation:

The volume of solid objects can be measured by completely immersing these solids in an overflow faucet filled to brim with a liquid in which the solid does not dissolve. This is known as the displacement method. When water is used, it is known as water displacement method.

In the Volume Lab Sheet, a sphere whose volume has been pre-calculated is immersed in the overflow faucet containing water. The displaced water is collected in a beaker and the volume is obtained using a 50 mL measuring cylinder.

The volume of a  sphere is calculated using the following formula:

Vsphere =  4πr³/ 3

The symbol π represents the number pi, which is about 3.14. The letter r stands for the  radius of the sphere, which is the distance from the center of a sphere to its surface. The  radius is exactly half of the diameter, which is the distance across the sphere through its center.

The volume of the water in the measuring cylinder is found to be equal to the calculated volume of the sphere. This is because an object immersed completely in a liquid displaces a volume of liquid equal to its own volume.

Atoms have no electric charge because they have an equal number of electrons and protons.

Explanation:

So from this, we can conclude that atoms have no electric charge because they have an equal number of electrons and protons. Option C is correct.

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