A brick falls to the ground. if the time for the collision of the brick and the ground is increased by a factor of 4, the force of the collision with the ground will change by a factor of:_______.

Answer:

If your birthday was celebrated already then you would be  23, but if your birthday isn't celebrated then you would be 22

Explanation:

The answer to the digits rounded to one significant figure is 100.

Significant figures are the most important figures in a number of digits.

The closer a digit is to the beginning of a number, the more important  or significant  it is.

But, the rule for rounding up a set of numbers to the first significant or to one significant figure is that:

From the numbers 98.907, 9 is the most significant digit followed by 8.

8 is greater than 5 so we should round up by adding one to 9 making the number 100.

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Amphibians retain a set of gills their whole lives that help them to breathe in the water. So, the correct option is D.

Amphibians are defined as the class of cold-blooded vertebrates which is made up of frogs, toads, salamanders, newts, and caecilians. All amphibians that spend part of their lives in water and part of their lives on land.

Amphibians are born with gills, and some outgrow them when they become adults while others retain them for their entire lives.

Thus, the correct option is D.

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The y-intercept of the lens represents the focal length of the lens.

The y-intercept of a lens refers to the point where the incident rays, parallel to the principal axis, converge or appear to diverge after passing through the lens. In other words, it represents the distance from the lens to the focal point.

When an object is placed between the focal point and the lens, a specific type of image is produced. This situation is known as an object placed in front of a converging lens. The characteristics of the image formed in this case are as follows:

1. Type: The image is virtual, meaning it cannot be projected onto a screen. It can only be seen when looking through the lens.

2. Orientation: The image is upright. It appears in the same orientation as the object.

3. Size: The image is magnified compared to the object. It is larger in size.

These three characteristics hold true when the object is positioned between the focal point and the lens. It is important to note that the specific values of the image's size and magnification would depend on the specific distance of the object from the lens and the focal length of the lens.

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Addition of vectors is done by adding the components of the vectors

The total speed of the fan  is approximately 9.43 m/s,

Direction of total wind 58° counterclockwise from the positive x-axis

The reason the value is correct is as follows:

The given parameters are:

The direction at which the fan blowing at 5 m/s is blowing = Easterly

The direction in which the fan blowing 8 m/s is blowing = Northerly

The total speed of the van, |v| ≈ 9.43 m/s

Required:

To find the total wind speed of the fans

Solution:

Taken the easterly direction as the ith component, and the northerly direction as the jth component,  the vector representing the speed of the fan is presented as follows

v = 5·i + 8·j

The magnitude of the total wind speed of the fan, |v| = √(5² + 8²) = √(89) ≈ 9.43

The total wind speed of the fan , |v| ≈ 9.43 m/s

The direction of the total speed with respect to the x-axis, θ, is given as follows;

θ = arctan(8/5) ≈ 58°

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Answer:

V = 26.95 cm³

Explanation:

Density is given by the formula :

ρ = m÷V

Density = mass ÷ Volume

Given both density and mass we rearrange, substitute and solve for Volume :

Rearranging the equation to make Volume the subject :

ρ = m÷V

ρV = m

V = m÷ ρ

Now substitute :

V = 45 ÷ 1.67

V = 26.9461077844

Take 2 decimal places as the density is 2 decimal places :

V = 26.95

Units will be cm³ as it is volume

Hope this helped and have a good day

One possible length of the second pipe is 2.1 m. When two closed pipes produce a beat frequency, it indicates that there is a slight difference in the frequencies of the sound waves produced by each pipe.

The beat frequency can be calculated using the formula:

Beat Frequency = [Frequency of Pipe 1 - Frequency of Pipe 2]

In this case, the beat frequency is given as 4.3 Hz.

Let's assume the frequency of Pipe 1 is f1 and the frequency of Pipe 2 is f2. We know that the length of Pipe 1 is 2.5 m.

The fundamental frequency of a closed pipe is given by:

f = v / (2L)

where v is the speed of sound and L is the length of the pipe.

If we substitute the values into the formula, we have:

f1 = v / (2 * 2.5) = v / 5

f2 = v / (2L)

The difference in frequencies is:

|f1 - f2| = |(v / 5) - (v / (2L))|

To obtain a beat frequency of 4.3 Hz, we need to find a possible value for the length of the second pipe (L) that satisfies this equation. By trying different values, we find that when the length of the second pipe (L) is approximately 2.1 m, the difference in frequencies gives a beat frequency of 4.3 Hz.

Therefore, one possible length of the second pipe is 2.1 m.

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If there are both electric and magnetic fields in the room and their effects on the charged particle cancel, and the electric field points upward, then the direction of the magnetic field is downwards.

The electric force on a charged particle is provided by an electric field, whereas the magnetic force is provided by a magnetic field. The effect of the electric and magnetic fields on the motion of the particle is a function of the relative directions and magnitudes of the two fields.

If the magnetic field is perpendicular to the electric field and the particle's velocity, the magnetic force is at right angles to both the electric force and the velocity, and it does not adjust the particle's speed. If the electric and magnetic forces on a charged particle are equal and opposite, they cancel each other out, resulting in no acceleration of the charged particle. Since the electric field is pointing upward, the magnetic field should be pointing downward.

In conclusion, the direction of the magnetic field is downward if the electric field is pointing upward, according to the given condition.

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We have to use Newton's Second Law, knowing that the friction force is

Then,

Because the friction force is against the movement.

We know that m = 5kg, F = 75N, friction = 10.

Let's solve for a

The acceleration is 13 meters per square second.

Also, the force acting on the object is 65N because we have a net force present there.

A certain slide projector has a 100 mm-focal length lens. (a) If the slide is 24.0 by 36.0 mm, the dimensions of the image projected by the slide projector are approximately 39.9 mm by 59.8 mm.

The dimensions of the image projected by the slide projector can be calculated using the thin lens equation, which relates the object distance, image distance, and focal length of a lens. In this case, the slide is the object, and the image is the projection on the screen.
The thin lens equation is:
1/f = 1/do + 1/di
where f is the focal length, do is the object distance, and di is the image distance. Since the slide is placed in the projector, the object distance is equal to the focal length of the lens, which is 100 mm.
To find the image distance, we need to assume that the slide is positioned at the focal point of the lens so that the image is formed at infinity. This is called the "slide-to-film" distance and is equal to the sum of the focal length and the distance between the slide and the film plane, which is usually around 150-200 mm.
Using these values, we can solve for the image distance:
1/100 = 1/100 + 1/di
1/di = 1/100 - 1/100
di = -10000 mm
This negative value indicates that the image is formed on the same side of the lens as the object, which is not physically possible. Therefore, we need to adjust the slide-to-film distance until the image is formed on the opposite side of the lens.
Assuming a slide-to-film distance of 150 mm, we can calculate the image distance:
1/100 = 1/100 + 1/di
1/di = 1/100 - 1/250
di = 166.7 mm
This means that the image is formed 166.7 mm behind the lens, which is approximately 6.6 inches.
To find the dimensions of the image, we need to use similar triangles. Since the slide has an aspect ratio of 2:3 (24 mm by 36 mm), the image will have the same aspect ratio.
Let x and y be the dimensions of the image, in millimetres. Then we can set up the following proportion:
x/24 = y/36 = di/f
Substituting in the values we just calculated, we get:
x/24 = y/36 = 166.7/100
x = 39.9 mm
y = 59.8 mm

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Answer:

Population 1 indicates growth while Population 2 indicates a declining population

Explanation:

Here, using the given rate of change of the population, we want to determine which of the two is growing and which is declining

From the rate of change of both, we can determine this. Looking at the differential equation for the first one, we can see that it is of positive value. Looking at the differential equation for the second one. we can see it is of negative value

While a positive change rate indicates growth, a negative change rate will indicate otherwise

Hence, we can conclude that the one with a negative rate change will indicate a declining population

Answer:

???

Explanation:

Not sure to which reaction the question refers

 but here is the simplest balanced equation

    P4 O10     +  6  H2 O ======>  4  H3 PO4  

So the answer may be   4 moles

If the reaction is using 9 moles of PO4   and 51 Moles of H2O

  the H2O will limit the number of moles of H3PO4 produced to 34 moles      this may be the answer the Q is looking for....H2O is the limiting reagent

The number of moles of H3PO4 form during the reaction is 4.

Limiting reagent of a reaction is defined as the reactant that is being completely used up in the reaction.

Here,

Given that,

The number of moles of P₄O₁₀ = 9

The number of moles of H₂O = 51

If 9 moles of P₄O₁₀ can form 36 moles of H₃PO₄, 1 mole of P₄O₁₀ can form 36/9 = 4 moles of H₃PO₄

The balanced equation for the reaction can be written as,

P₄O₁₀ + 6H₂O ⇒ 4H₃PO₄

From the equation, we can say that 1 mole of P₄O₁₀ and 6 moles of H₂O will form 4 moles of H₃PO₄

H₂O is the limiting reagent of this reaction.

Hence,

The number of moles of H3PO4 form during the reaction is 4.

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The strong nuclear force overcomes the repulsive electric force of protons in the atomic nucleus because it is a much stronger force. It is able to act over very short distances and is mediated by particles that are much heavier than electrons and photons.

The repulsive electric force of protons in the atomic nucleus does not cause the protons to fly apart because of the strong nuclear force. The strong nuclear force is an attractive force between nucleons that overcomes the repulsion between protons due to the electromagnetic force. This force is responsible for holding the nucleus of an atom together.

We will explain the physics behind why the strong nuclear force overcomes the repulsive electric force. The protons in the nucleus are positively charged and would normally repel each other due to the electrostatic force. The reason why they do not is because they are held together by a stronger force, the strong nuclear force. This force acts between nucleons, which are particles found in the nucleus of an atom. The strong nuclear force is a short-range force that acts over distances of less than a femtometer. It is much stronger than the electrostatic force, which is why it is able to hold the nucleus together. The reason for this is that the strong nuclear force is mediated by particles called mesons, which are much heavier than electrons and photons. The strong force is able to overcome the repulsion between protons because it is much stronger than the electromagnetic force, which is what causes the repulsion in the first place.

The strong nuclear force overcomes the repulsive electric force of protons in the atomic nucleus because it is a much stronger force. It is able to act over very short distances and is mediated by particles that are much heavier than electrons and photons. This force is responsible for holding the nucleus of an atom together and is what allows for the existence of matter as we know it.

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Electrons that are located in the outermost orbit in the Bohr model of a boron atom will be 3.

A nucleus with six neutrons and five protons makes up the Bohr model of boron. The K-shell and L-shell electron shells around the nucleus The valence electrons, which make up three of the electrons in the outermost shell of the Bohr diagram, are also present. The orbits of the electrons around the small nucleus are described by the Bohr model of boron.

It utilizes a number of different electron shells, including K, L, M, and N. The number of electrons that each shell can hold varies, with the shell closest to the nucleus having the least energy. The energy levels increase as the shell recedes more. According to the Bohr model, the electrons in an atom may be seen to orbit the nucleus in a variety of orbits with differing energies.

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There is direct relationship between harmonics and resonance frequency.

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Answer:

A

Explanation:

this is because the law of reflection states that the angle of incidence equals to the angle of the reflection.

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It uses one main simple machine, the lever, to propel a projectile, making it both a compound machine (a device that employs a number of simple machines) and a simple machine.

A trebuchet is a form of catapult, a weapon that can launch things considerably farther than a person can. The usage of trebuchets is first recorded in second-century China, however catapults were in use far before the Roman Empire. Trebuchets are most known for their use in medieval castle raids because they could be placed so far away from the fortress that archers couldn't touch them and could launch practically anything.

They are the most basic techniques that are now understood for using leverage (or mechanical advantage) to increase force. The wheel and axle, inclined plane, lever, wedge, pulley, and screw are examples of rudimentary machines.

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Answer:

Average Velocity: 0

Average Speed 0.8

Explanation:

Velocity - (30-30)/75 = 0

Speed - (30+30)/75 = 0.8

\( \large{ \boxed{ \tt{447.3 \: m}}}\)

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Answer: We don't have enough information to find the individual diameters, only their difference. But we can conclude that the difference in diameters between the two spheres is 7.1 mm

Explanation:

A capacitor is a device used to store electrical charge. It consists of two conductive plates separated by a gap, called the dielectric. In the case of a spherical capacitor, the plates are two concentric spheres, with a gap between them. The capacitance of the capacitor is a measure of its ability to store charge, and is given by the following expression:

C = 4πε₀r₁r₂ / (r₂ - r₁)

where C is the capacitance,

r₁ is the radius of the inner sphere,

r₂ is the radius of the outer sphere,

and ε₀ is the permittivity of free space (a physical constant).

To solve the problem, we are given that a spherical capacitor with a 1.0 mm gap between the shells has a capacitance of 100 pf. We can use this information and the expression for capacitance to find the radii of the two spheres.

First, we need to convert the gap between the shells from millimeters to meters, since the equation requires the radius in meters. 1.0 mm is equal to 0.001 m.

Next, we can rearrange the capacitance equation to solve for r₂ - r₁:

r₂ - r₁ = 4πε₀r₁r₂ / C

Now we can substitute the given values and solve for r₂ - r₁:

0.001 m = 4π(8.85 x 10^-12 F/m)(r₁)(r₂) / 100 x 10^-12 F

r₂ - r₁ = 0.00355 m

Finally, we can use the relationship between the radii and the diameters of the spheres to find the diameters:

D₁ = 2r₁ and D₂ = 2r₂

Substituting the value of r₂ - r₁, we get:

D₂ - D₁ = 0.0071 m

We don't have enough information to find the individual diameters, only their difference. But we can conclude that the difference in diameters between the two spheres is 7.1 mm

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The total pressure acting on the submarine is approximately 106,993.6 Pa.

To calculate the total pressure acting on the submarine, we need to consider both the pressure due to the depth of the seawater and the atmospheric pressure.

The pressure due to the depth of the seawater can be calculated using the formula:

Pressure = density × gravity × depth

where density is the density of the seawater, gravity is the acceleration due to gravity, and depth is the depth of the submarine below the seawater.

Given:

Density of seawater = 1020 kg/m³

Depth of submarine below seawater = 40 cm = 0.4 m

Acceleration due to gravity = 9.8 m/s²

Pressure due to the depth of the seawater = 1020 kg/m³ × 9.8 m/s² × 0.4 m = 3993.6 Pa

Next, we need to consider the atmospheric pressure, which is given as 103,000 Pa.

To find the total pressure acting on the submarine, we need to add the pressure due to the depth of the seawater to the atmospheric pressure:

Total pressure = Atmospheric pressure + Pressure due to depth of seawaterTotal pressure = 103,000 Pa + 3,993.6 Pa

Therefore, the total pressure acting on the submarine is approximately 106,993.6 Pa.

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Answer:

6180

Explanation:

if he is riding at 10.3 meters per second, and is riding for 10 minuets you multiply 10.3 by 60 for 1 minuet and get 618. Then multiply 618 by 10 for 10 minuets and you get 6180

Answer:

618 of 103

Explanation:

If you do 10.3 x 60 you will get 618

If you do 10.3 x 10 you will get 103

The statement " The centroidal axis and neutral axis are always the same in both straight and curved beam" is false.

In straight beams, the centroidal axis and neutral axis are coincident because the cross-section of a straight beam is symmetric about the centroidal axis. However, in curved beams, the centroidal axis and neutral axis may not coincide because the cross-sectional area of a curved beam is not symmetric about the centroidal axis.

The neutral axis of a curved beam is the axis passing through the centroid of the cross-sectional area that is subjected to zero stress when the beam is loaded. In general, the neutral axis of a curved beam is located at a distance from the centroidal axis that depends on the curvature of the beam and the shape of the cross-section.

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Answer:

1.7 g/cm³

Explanation:

Given that:

Density of substance = 3.4 g/cm³

Relative density to another substance = 2

Density of second substance=?

Let density of second substance = x

Relative density = density of substance / density of second substance

Relative density = density of substance / x

2.0 = 3.4g/cm³ / x

2 * x = 3.4 g /cm³

x = 3.4 g/cm³ ÷ 2

x = 1.7 g/cm³

Every magnet consists of two poles one is the south pole other one is the north pole. All magnets have two poles. This statement is correct.

The area at either end of a magnet where the external magnetic field is strongest is known as a magnetic pole.

Every magnet consists of two poles one is the south pole other one is the north pole like poles attracts each other while unlike poles repel each other.

Hence option (a) is correct. All magnets have two poles.

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The angle of the plate will affect how much sunlight hits the plate. The amount of sunlight that hits a surface depends on the angle of incidence, which is the angle at which the sunlight hits the surface. When the angle of incidence is perpendicular to the surface (i.e., the sun is directly overhead), the maximum amount of sunlight is received by the surface.

However, as the angle of incidence increases, the amount of sunlight that hits the surface decreases because the same amount of sunlight is spread over a larger area. Therefore, if the plate is not angled properly to face the sun, it will receive less sunlight, which will affect its efficiency in converting sunlight into electricity.

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a) Volume = 2.07074454 m^3. b) Heater needs to be on for approximately 45.7 minutes.

The issue gives us the underlying states of an unbending tank containing an immersed fluid fume blend of water at a strain of 100 kPa. The absolute mass of the blend is 5 kg, with just 75.6% of it being fluid. We are approached to decide the volume of the compartment and the time the electric opposition radiator should be turned on until all the water has disintegrated.

To address for the volume of the compartment, we first need to track down the particular volume of the underlying combination. Utilizing the given data that 75.6% of the complete mass is fluid, we can find the mass of the fluid and utilize the steam tables to decide the particular volumes of the immersed fluid and fume at 100 kPa. With this data, we can compute the absolute volume of the combination. The subsequent volume is around 2.07074454 m^3.

To make the opportunity expected for the radiator to disintegrate all the fluid, we can utilize the energy balance condition. We decide the energy expected to disintegrate all the fluid utilizing the particular enthalpy of the immersed fume at 100 kPa and the particular enthalpy of the soaked fluid at 100 kPa. We then, at that point, partition this energy by the force of the radiator, which is a consistent 3.4 kW, to get the time expected for the warmer to disintegrate all the fluid. The subsequent time is roughly 45.7 minutes.

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Answer:

The velocity-time graph is illustrated and it shows the speed and direction that's traveled by the bicycle.

A velocity-time graph simply shows the speed and the direction that an object travels over a particular period of time.

It should be noted that they're also known as the speed-time graph. On the vertical axis is the velocity of the object.

Since 60 minutes = 1 hour 3 minutes will be converted to hour. This will be:

= 3/60 = 1/20 hour.

5 minutes will be changed to hour. This will be: = 5/60 = 1/12 hours.

Explanation: