2 attempts left enter your answer in the provided box. a metal ball-bearing with a circumference of 41.3 mm weighs 8.77 g. what is the density of the metal in g/cm3 (v of a sphere

When the force applied on the ball causes it o accelerate into the field

goal, Positive work is done on the ball.

option B.

A work is said to be done when an applied force causes a displacement of an object.

Mathematically, the formula for work done is given as;

W = Fd

where;

Thus, when  a soccer player kicks a ball moving in a straight line

towards the field goal, causing it to accelerate into the field goal, the work done on the ball is a Positive work.

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The other end of the pool is approximately 24.2 meters away.

Pool is a game played on a table with six pockets, in which players use a cue stick to hit balls into the pockets. The game is enjoyed by people of all ages, and is especially popular in the United States and Europe.

The other end of the pool is approximately 24.2 meters away. This can be determined using the equation
speed = distance/time
In this case, the speed of the wave is 0.643 m/s, the time is 36.7 s, and the distance is unknown. We can rearrange the equation to solve for the distance:
distance = speed * time
Therefore, the distance is 0.643 m/s * 36.7 s = 24.2 m. This means that the other end of the pool is approximately 24.2 meters away.

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Answer:

Explanation:

Cedric is correct because he used the inverse of subtraction and added 4.5

Most geologist think the movement of Earth’s plates are caused by: convection currents in the mantle. Option C- is the correct answer.

This occurs as a result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.

These convection currents are in three forms namely:

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The minimum time required to raise the bucket a vertical distance of 12m without breaking the cord is 2.58s

Given the mass of bucket of water (m) = 5.60kg

The strength acting on bucket is (F) = 75N

The distance bucket is raised (s) = 12m

Let the time taken to raise the bucket = t

So, W = m x g as a force of gravity is always acting on a system.

W = 5.60 x 9.8 such that W = 54.88N

The maximum accelerating force acting on the cord (Fr) = 75 - 54.88 = 20.12N

We know that from Newtons laws of motion F = ma where a is the acceleration and F is the force.

Fr = ma then a = 20.12/5.60 = 3.59m/s^2

Then according to the problem s = ut + 1/2at^2 where u is initial velocity which is 0m/s as at rest initially.

So, s = 1/2at^2 then 12 = 1/2 x 3.59 x t^2

t^2 = 24/3.59  = 6.68

t = 2.58s

Hence the minimum time required to raise the bucket a vertical distance of 12 m without breaking the cord is 2.58seconds.

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A 180 kg hippo is riding a bicycle at a speed of 6. 0 m/s. 0.135 sec will it take to stop the bicycle

The kinetic energy of an object can be calculated using the equation:

KE = (1/2) × m × v^2

where m is the mass of the object, v is its velocity.

The work done by the brakes is given by the force of the brakes multiplied by the distance over which the brakes are applied. This can be written as:

W = F × d

As the force of the brakes is equal to the force that opposes the motion of the object and the force is constant, then,

F × d = KE

W = (1/2) × m × v^2

d = (2 × KE) / F

where d is the distance over which the brakes are applied, F is the force of the brakes and m, v are the mass and velocity of the object

Now we can substitute the known values into this equation:

d = (2 × (1/2) × 180 kg × (6 m/s)^2) / 1600 N = 0.81 m

Now we can find the time it takes to stop the bicycle:

t = d / v = 0.81 m / 6 m/s = 0.135 s

So it will take the hippo 0.135 seconds to stop the bicycle using the brakes.

The energy that an object has when it moves is called kinetic energy. It is equivalent to the amount of work required to propel an object from rest to its current velocity. The following equation can be used to determine an object's kinetic energy:

where v is the object's speed and m is its mass. The joule (J) is the unit of kinetic energy.

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The information supports the assertion that the elementary charge has a value of 1.6. All of the values are more than that number, proving the assertion.

Utilizing augmented reality (AR) technology, the Measure app transforms your iPhone into a tape measure. Objects' sizes can be estimated, the measurements of rectangular objects can be automatically determined, and a photo of the measurement can be saved.

Simple measurements are those that just employ one kind of unit. hours and minutes To find all three numbers in seconds, we must use the conversion factors, for instance, if we wish to convert 2 hours, 23 minutes, and 12 seconds into seconds.

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The elastic potential energy of the spring is  375 J. Option C

We have to note that the elastic potential energy has to do with the energy that has been stored in the elastic material and it can be released to do work once the spring has been stretched.

It should be noted that we would have that;

The elastic potential energy which we have shown as E is obtained from;

E = 1/2Fx

F = force applied

x = The stretching of the spring

Then

E = 0.5 * 150 * 5

E = 375 J

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Answer: Through observing the motion of sunspots

Explanation:

Answer:

The Sun spins on its axis once every 27 days. Its rotation had been initially discovered by watching the movement of sunspots. Because the Sun's rotational axis is tilted by around 7.25 degrees first from the direction of the Earth's orbit, humans observe more of the Sun's north pole in September & more of the south pole in March.

"Rod cells in the eye detect light and dark." completes the sentence.

Light is defined as electromagnetic radiation visible to the human eye with wavelengths ranging from 380 to 750 nm. Light is a type of electromagnetic radiation that enables or makes objects visible to the human eye. It's also known as visible radiation to the eye. Light contains photons, which are tiny packets of energy. Lux (lx) (lx) The unit of illumination is the lux, which is equal to one lumen per square metre. The metric equivalent of footcandles is one lux equals 0.0929 footcandles.

Here,

"In the eye, rod cells detect light and dark." completes the sentence.

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The buoyant force exerted on the 1 kg rock by the water is 2 N.

The buoyant force is the force exerted by a fluid (in this case, water) on an object that is submerged in it. To find the buoyant force, we need to subtract the weight of the object when it is submerged in the fluid from the weight of the object when it is suspended above the fluid.

The weight of the rock when it is suspended above water is 9.8 N (the weight of the rock is equal to its mass multiplied by the acceleration due to gravity, which is 9.8 m/s²).

The weight of the rock when it is suspended beneath the surface of the water is 7.8 N.

To find the buoyant force, we can use the following formula:

Buoyant force = weight of object above fluid - weight of object below fluid

Buoyant force = 9.8 N - 7.8 N = 2 N

Therefore, the buoyant force exerted on the 1 kg rock by the water is 2 N.

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The boundary condition at a perfectly insulated surface (at x = 0, for example) can be expressed as [latex] -k frac{partial T(0, t)}{partial x}=0 [/latex]

This node is the default boundary condition for all Heat Transfer interfaces. This boundary condition means that there is no heat flux across the boundary:

and hence specifies where the domain is well insulated. Intuitively, this equation says that the temperature gradient across the boundary is zero. For this to be true, the temperature on one side of the boundary must equal the temperature on the other side. Because there is no temperature difference across the boundary, heat cannot transfer across it. As the default boundary condition, it can be applied only on external boundaries; but when added manually, it can be applied also on interior boundaries.

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A positive charge and a negative charge held a certain distance apart are released and when they move, the force on each particle increases.

The charge carriers  are the positively charged proton and the negatively charged electron. The movement of any of these charged particles constitutes and explained as electric current.

When there are more or fewer protons in an atom than electrons, the substance has an electric charge. Protons have a positive charge on them, while electrons have a negative charge on them. If a substance has more protons than electrons, it is positively charged; if it has more electrons, it is negatively charged.

The SI units for charge can be written as ampere-second or coulomb.

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There's no harm done because this is really the low current there is and not many electrons transferred between you and the doorknob.

Voltage just says what is the tendency for charges to move. But it's actually the current that does harm to the body, which is the number of charges per second that move.

Electric field is the voltage or the potential difference between two points divided by the distance between them. We can solve this for V by multiplying both sides by d. So V is electric field times distance. We have electric field of about 3 times 10 to the six volts per meter when air starts to have dielectric breakdown and starts conducting and you have a spark. That's times by the separation between your finger and the doorknob which is one millimeter, which is one times 10 to the minus three meters. So the voltage must be about 3,000 volts.And in this case, there is not very many charges, and so no harm done.

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Answer:

Explanation: It's R/n

It is 1.93 metres away from the post.

for vertical motion

[tex]S= u t + \frac{1}{2} g t^{2}[/tex]

S = 0 +  [tex]\frac{1}{2} g t^{2}[/tex]

1.7 = [tex]\frac{1}{2} 9.8 t^{2}[/tex]

t = 0.589 sec

using law of  conservation of momentum, on the horizontal motion

[tex]m_{bullet} \ v_{bullet i} = m_{bullet} \ v_{bullet f} + m_{tin} \ v_{tin}[/tex]

[tex]0.0020 = 0.0020 \ 3 \ 720 + 0.11 \ v_{tin}[/tex]

[tex]v_{tin}[/tex] = 3.273 m/s

S = [tex]v_{tin} \ t[/tex]

   = 3.273 m/s * 0.589 s

   = 1.93 m

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The very slight sound of the impact will reach the spider first, as sound travels faster than the disturbance traveling along the radial thread of the web.

The speed of sound is about 343 meters per second, while the disturbance traveling through the web is much slower.

The spider's ability to detect and react to sound is an important part of its survival, as it allows it to detect predators and other potential threats. Additionally, spiders use sound to communicate with each other and to find potential mating partners.

By understanding how sound travels and how spiders use sound to detect their environment, we can gain a better understanding of how spiders interact with their environment and how they communicate with each other.

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The change in internal energy of an ideal gas is 826.9 J. Internal energy, represented by the symbol U, is the total energy of a system.

The change in internal energy of an ideal gas can be calculated using the equation:

ΔU = nCΔT

where ΔU is the change in internal energy, n is the number of moles of gas, C is the heat capacity at constant volume, and ΔT is the change in temperature.

Since the heat capacity at constant volume for an ideal gas is (3/2)R, we can use the ideal-gas equation to find the number of moles n = PV/RT = (810^-3 m^3)(101325 Pa)/(8.314 J/molK)(340 K) = 0.965 mol

We know that the volume of the gas expanded to 2.3 times its initial volume, thus the change in volume is 2.3 - 1 = 1.3 times

The change in internal energy can be calculated by using the equation:

ΔU = nCv(ΔT) + nRT ln(Vf/Vi)

where Cv is the heat capacity at constant volume = (3/2)R, T is the temperature, and Vf and Vi are the final and initial volume respectively.

So, ΔU = 0.965 x (3/2) x 8.314 x (340) + 0.965 x 8.314 x 340 x ln(2.3) = 826.9 J

Therefore, the change in internal energy of the gas is 826.9 J.

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We observe the Andromeda galaxy as it was 2.5 million years ago since it is around 2.5 million light years away.

We observe the Andromeda galaxy as it was 2.5 million years ago since it is around 2.5 million light years away. The Andromeda galaxy's light was first visible 2.5 million years ago. The Andromeda galaxy may have gotten a few thousand light years nearer to us during those 2.5 million years. While the diameter of the Andromeda galaxy itself is roughly 200 thousand light years, the uncertainty in the 2.5 million light year distance estimate is on the order of 100 thousand light years (simply because estimating the distance to other galaxies is difficult).

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The density of seawater at a depth where the pressure is 680 atm is 2576 kg/m3. Bulk modulus is defined to be measure of its resistance to compression.

The bulk modulus of a substance is a measure of its resistance to compression. It is defined as the ratio of the change in pressure to the resulting fractional change in volume. The density of a substance can be affected by changes in pressure. The equation to calculate density at a certain pressure is:

density = density surface x (1 + (bulk modulus x pressure) / (density surface x gravity x height surface))

where density surface is the density of the substance at the surface, bulk modulus is the bulk modulus of the substance, pressure is the pressure at a given depth, gravity is the acceleration due to gravity, and height surface is the height of the surface of the substance.

In the case of seawater:

density = 1030 kg/m3 x (1 + (2.3*10^9 N/m2 x 680 atm) / (1030 kg/m3 x 9.8 m/s^2 x 0))

density = 1030 kg/m3 x (1 + 1.502)

density = 1030 kg/m3 x 2.502

density ≈ 2576 kg/m3

So the density of seawater at a depth where the pressure is 680 atm is approximately 2576 kg/m3.

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The windings' current is 8.00 A. A location close to the solenoid's center has a magnetic field of 0.0111 T.

The magnetic field at a point near the center of a solenoid can be calculated using the following formula:

B = (μ₀xnxI) / L

Where:

B is the magnetic field

μ₀ is the permeability of free space, which is 4π x 10^(-7) Tm/A

n is the number of turns per unit length of the solenoid, in turns/m

I is the current flowing through the solenoid, in A

L, length of solenoid

Given the radius of the solenoid as 0.75 cm = 0.0075 m, and the length of the solenoid as 15.0 cm = 0.15 m, the cross-sectional area of the solenoid is:

π*(0.0075 m)² = 1.767 x 10^-5 m²

The number of turns per unit length of the solenoid can be calculated by dividing the total number of turns by the length of the solenoid:

600 turns / 0.15 m = 4000 turns/m

We can now substitute these values into the formula:

B = (4π x 10^(-7) Tm/A) * (4000 turns/m) * (8.00 A) / (0.15 m)

B = 0.0111 T

Therefore, the magnetic field at a point near the center of the solenoid is 0.0111 T.

It is worth noting that this result is valid only when the solenoid is long enough so that its ends do not affect the magnetic field inside. Also, the solenoid is considered as tightly wound and the radius of the solenoid much smaller than the length, so that the magnetic field inside the solenoid is uniform.

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The value of g inside the earth at half of its radius is 4.9 m/s², if the value of g at the surface of the earth is 9.8 m/s².

Let the uniform density of the earth, = ρ

Radius of the earth, = R

We know the relation between the uniform density(ρ) of the earth and the acceleration due to gravity of the earth is as follows:

g = Gρ(4/3)πR

Let the value of acceleration due to gravity at (r = R/2) is g₁.

Then g₁ = Gρ(4/3)π(R/2)

g₁ = (1/2)Gρ(4/3)π(R)

g₁ = (1/2) × g

g₁ = (1/2) × 9.81 = 4.9 m/s²

Hence the correct option is 1.

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The ratio of the engine's work, W, to the heat absorbed from the high-temperature heat source, QH, is the measure of a heat engine's efficiency, or e. In mathematical terms, it looks like:e = W/QH

According to the second law of thermodynamics, the maximum efficiency of a heat engine, also known as the Carnot efficiency, eC, is equal to the difference between the temperatures TH and TC:

eC = 1 - (TC/TH) The Carnot efficiency is the maximum efficiency of a theoretical heat engine, also known as a Carnot engine, which operates between two temperatures TH and TC and is thought to be the most efficient heat engine possible.

Therefore, the following is the range of possible e values for a heat engine operating between TH and TC:

0 e eC = 1 - (TC/TH), indicating that a heat engine's efficiency cannot exceed the Carnot efficiency and cannot fall below 0.

A heat engine's maximum theoretical efficiency is measured by the Carnot efficiency, after the French engineer Sadi Carnot. The ratio of the heat engine's work to the heat absorbed from the higher-temperature heat source is what is used to define it. It is calculated as follows:

eC is equal to 1 - (TC/TH), where TC is the cold reservoir temperature and TH is the hot reservoir temperature.

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The speed of a bicycle and its rider with a combined mass of 120 Kg is 50m/s.

                           momemtum of the car = mass × speed

                                                                 = 1200 × 5

                                                                 = 6000 kg m/s

       Mass of the bicycle = 120 kg.

                                 momentum of the bicycle = mass × speed

                                                  [tex]speed = \frac{6000}{120} \\\\ speed = 50 m/s[/tex]    

Therefore, the speed of the bicycle and its rider = 50 m/s      

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The average force acting on a given area is 21.98 Pa.

A force is an influence in physics that can change the motion of an object. A force can cause a mass object to change its velocity, or accelerate. Intuitively, force can be described as a push or a pull. A force is a vector quantity because it has both magnitude and direction.

Here,

Force = Mass X acceleration = 0.004kg x 9.8. This is when the hailstone is not inclined at an angle.

When the hailstone is inclined at an angle of 45, then the component of force along the glass window will be F =0.004kg x 9.8 x sin20= 0.005kg x 9.8 x 0.707= 0.0357N.

Therefore, total force for the 500 hailstones would be 500x0.0357N=17.85N

This force is acting on an area equal to 0.788m2

Pressure = Force per unit area = 17.32N/0.788m2 = 21.98Pa

The force is acting on an area known as average force is 21.98 Pa.

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In the transverse wave, point D represents the trough of the wave.

option D.

A wave two important points point, one curves upwards while the other curves downwards.

The maximum value of upward displacement within a cycle of a wave is known as crest. So the crest is a point on a surface wave where the displacement of the medium is at a maximum.

The maximum value of downward displacement within a cycle of a wave is known as trough.

Thus, from the graph, point A represents crest of the wave while point D represents trough of the wave.

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(a) Energy per photon is [tex]3.8 x 10^{-19 }J[/tex] and Number of photons per second is [tex]2.63 x 10^{20}[/tex] photons/s.

A 100-W yellow lightbulb emitting at 550 nm has a wavelength of [tex]550 x 10^{-9 }[/tex]meters. The energy per photon can be calculated using the relationship:

Energy per photon = h * c / wavelength

where h is Planck's constant ([tex]6.62607015 x 10^{-34} Js[/tex]) and c is the speed of light (299792458 m/s).

Substitute the values:

Energy per photon = [tex](6.62607015 x 10^{-34} Js) * (299792458 m/s) / (550 x 10^{-9} m)[/tex]

Energy per photon = [tex]3.8 x 10^{-19 }J[/tex]

To calculate the number of photons emitted per second, we can use the relationship:

Number of photons per second = Power / Energy per photon

By substituting the values:

Number of photons per second = [tex]100 W / (3.8 x 10^{-19} J)[/tex]

Number of photons per second = [tex]2.63 x 10^{20}[/tex] photons/s

(b) Energy per photon is [tex]2.0 x 10^{-25 }J[/tex] and Number of photons per second is [tex]5.0 x 10^{25}[/tex] photons/s

A 1-kW microwave source emitting at a wavelength of 1 cm has a wavelength of 1 x 10^-2 meters. The energy per photon can be calculated using the same relationship as before:

Energy per photon = h * c / wavelength

Energy per photon = [tex](6.62607015 x 10^{-34} Js) * (299792458 m/s) / (1 x 10^{-2} m)[/tex]

Energy per photon = [tex]2.0 x 10^{-25 }J[/tex]

To calculate the number of photons emitted per second, we can use the same relationship as before:

Number of photons per second = Power / Energy per photon

Number of photons per second = [tex]1000 W / (2.0 x 10^{-25} J)[/tex]

Number of photons per second = [tex]5.0 x 10^{25}[/tex] photons/s.

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1) They would collide with the walls more frequently

2) They would collide with the walked more frequently

We know that collisions occur when there is a bump of an object against an obstacle. In the case of the scenario that we have here, we have been told that there are 50 people walking in straight lines in a room. If we move the walls to half the size they would collide with the walls more frequently.

In the second case, if the people that were walking in a straight line now begin to run, the chances are that they would collide with the walls more frequently.

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The weight of an 8200 N spacecraft when it is 43200 km above earth's surface is 136.5 N

The formula for the gravitational force between two objects is:

F = GMm/r²

Where:

G = gravitational constant

M, m = mass of the objects

r = distance between objects.

Notice that the gravitational force is inversely proportional to the square of the distance.

Hence,

F1 : F2 = (r2)² : (r1)²

In this case:

r1 = 6400

r2 = 6400 + 43200 = 49600

The gravitational force between earth and the spacecraft represents the weight of the satellite. Hence,

w1 : w2 = (r2)² : (r1)²

8200 : w2 = 49600² : 6400²

w2 = 136.5 N

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Answer:55

Explanation: hope thi heps!