A 3.9 kg ball traveling towards a soccer player at a velocity of -3.5 m/s rebounds off the soccer player's foot at a velocity of +15.9 m/s. If the Force of contact between the ball and the player's foot was 25.9 N. For how long was the force applied?

Do you remember the old fashioned flashlights, before there were LEDs ?

They had two or three heavy batteries in the tube, and one little tiny glass light bulb in the middle of the little headlight in the front.  When the batteries were fresh, that little light bulb gave out a nice bright beam of light, and drew about 0.7 Amperes from the batteries.  That's the number I want you to remember for a couple of minutes:  Flashlight bulb, 0.7 Amperes.

-- The wiring (nerves) that operate your heart can go haywire, and your heart can stop or go crazy, if 0.015 Amp of current or more happens to pass close by it.

-- The muscles in your arms or legs, or your diaphragm that makes you breathe, can lock up so that you can't control them, if 0.1 Amp of current or more happens to pass by them.  If that current is 0.5 Amp or more and passes close to a muscle, the muscle can lock up so violently that it breaks the arm- or leg-bone that it's attached to.

Lightning is electric current flowing between a cloud and the ground.  If anything is in the path it wants, it just flows right on through.  

Lightning may flow in either direction ... up to the cloud or down to the ground.  It really doesn't make any difference.  The effects are the same, on anything it decides to flow through.

The current in a typical, average lightning bolt is 30,000 Amperes.  A lot of them are bigger.

Current flowing through anything causes heat to be generated.

The more current  =  the more heat.

-- Lightning flowing through the wall of a house generates enough heat inside the wall to make the wall explode.

-- Lightning flowing through the juice inside a tree generates enough heat to boil the tree juice, and explode the tree.

-- Lightning flowing through the air heats a skinny tube of air so hot and so fast that the air explodes.  That makes a strong sound wave in the air, that can be heard from miles away.  It's called "thunder".

-- A person is made of lots of nice soft, moist, mushy stuff, water, juices, and air.  A thousand Amperes flowing through it all can do a fast, efficient, complete job of heating it, boiling it, cooking it, exploding it, and tearing it to pieces.  

Sounds dangerous to me.

Answer:

Central core

Explanation:

Answer:

a) The distance each child ran is approximately 0.232 m

b) The angular acceleration is 0.21[tex]\overline 6[/tex] rad/s²

Explanation:

The given parameters of the merry-go-round are;

The mass of the merry-go-round, m = 240-kg

The diameter of the merry-go-round, d = 4.00 m

The number of children pushing tangentially on the merry-go round = Four children

The spinning rate of the merry-go-round, n = 2.14 rev/minute

a) Given that the force exerted by each child = 26 N, we have;

The total force applied by the four children, F = 26 N × 4 = 104 N

The tangential acceleration, [tex]a_t[/tex] = F/m = 104 N/240-kg = 0.4[tex]\overline 3[/tex] m/s²

The angular acceleration, α = [tex]a_t[/tex]/r

Where, the radius of the merry-go-round, r = d/2

∴ r = 4.00 m/2 = 2.00 m

α = 0.4[tex]\overline 3[/tex] m/s²/(2.00 m) = 0.21[tex]\overline 6[/tex] rad/s²

We have;

ω² = ω₀² + 2·α·Δθ

The merry-go-round starts from rest, therefore; ω₀ = 0 rad/s

ω² = 2·α·Δθ

Δθ = ω²/(2·α)

n = 2.14 rev/minute

∴ ω = 2·π×2.14/60 rad/s ≈ 0.22410 rad/s

∴ Δθ = (0.22410 rad/s)²/(2 × 0.21[tex]\overline 6[/tex] rad/s²) ≈ 0.11589 rad

Therefore, the angle each child ran, θ = 0.11589 rad

The distance each child ran = r·θ

∴ The distance each child ran = 2.00 m × 0.11589 rad ≈ 0.232 m

b) From part 'a' above, the tangential acceleration, [tex]a_t[/tex] = 0.4[tex]\overline 3[/tex] m/s²

Angular acceleration, α = [tex]a_t[/tex]/r

∴ α = 0.4[tex]\overline 3[/tex] m/s²/(2.00 m) = 0.21[tex]\overline 6[/tex] rad/s²

The angular acceleration = 0.21[tex]\overline 6[/tex] rad/s²

Answer:

Food is potential energy because as our bodies digest it then the stored energy will turn into energy that helps us to move and grow

Explanation:

i hope this helps

Answer:

Squamous epithelium has cells that are wider than their height (flat and scale-like). ... Cuboidal epithelium has cells whose height and width are approximately the same (cube shaped). Columnar epithelium has cells taller than they are wide (column-shaped).

Answer:

False

Explanation:

Because as soon as you hit the person, all of your "charge" you've created gets destroyed by forcing you to hit another object, and therefore cannot be charged.

Answer: [tex]1.8409\ kN[/tex]

Explanation:

Given

Mass of student [tex]m=70\ kg[/tex]

Mass of Jupiter [tex]M=1.901\times 10^{27}\ kg[/tex]

Distance between them is [tex]r=6.98\times 10^7\ m[/tex]

Gravitational force is given by

[tex]\Rightarrow F=\dfrac{GmM}{r^2}\\\\\Rightarrow F=\dfrac{6.74\times 10^{-11}\times 70\times 1.901\times 10^{27}}{(6.98\times 10^7)^2}[/tex]

[tex]\Rightarrow F=18.409\times 10^{-11+27-14}=1.8409\ kN[/tex]

If the distance is cut to half, then the force will be four times the initial force

Answer:

B. Mass

Explanation:

mass Includes newton which is a measure of force

weight is a measure of force. hence option D is correct.

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. Balanced forces are those forces which are opposite in direction and equal in magnitude. When Net force acting on a body is zero then we call it as balanced force. Balanced force is not responsible for the motion of the body. ex. when two persons pulling rope on both end with equal magnitude which cause them to be balanced force have 0 net force. Unbalanced forces are those when resultant of all the forces is not equal to zero is called as unbalanced force. unbalanced force is responsible for the motion of the body.

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Answer:

the answer is that it increases by a factor of 16

Explanation:

Answer:

c and b

Explanation:

Explanation:

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they have a pictures just click and thats the answer ↑

The farther you live from an ocean, the more likely you will have a continental climate where there are extreme temperature differences in summer and winter

Inland regions have continental climates. To feel the impacts of ocean water, they are too distant from oceans. Between 40 and 70 degrees north latitude, continental climates are typical.

Northern Ukraine, eastern Belarus, Russia, the majority of Finland, and northern Sweden all have climates that are classified as continental. The northeast has the coldest winters and warmest summers, with winters being significantly colder, longer, and covered in more snow than in western Europe.

Given data ,

Let the land be situated at a place where it is farther away from the ocean

Now , there will be extreme temperature differences during the summer and the winter time

And , winters may be quite cold and summers can be very hot in continental climes. As there is less water in the continental environment than there is in marine climates, the temperatures are not as warm.

Hence , the continental climate takes place the farther you live from an ocean

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Answer:

d

Explanation:

thats how it works

Answer:

its 100 times stronger

Explanation:

hope its right

Answer:

Explanation:

A convex mirror is used in automobiles to have a Clear View of the traffic behind because they give an erect, virtual, full size diminished image of distant objects with a wider field of view.

hope it helps :)

Answer:

C. Sternal Head, Clavicular Head

Answer:

0.0025H

Explanation:

I didn't come here to be part of this all I wanted is just information for my research

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Answer:

to something in action there is always a equal and opposite reaction. Like if you bounce a bounce ball on the ground, it will bounce back.

Explanation:

Answer:

The center of mass of the human body depends on the gender and the position of the limbs. In a standing posture, it is typically about 10 cm lower than the navel, near the top of the hip bones. In this Atom, we will learn how to measure the COM of a human body.

Explanation:

In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular acceleration. Calculations in mechanics are often simplified when formulated with respect to the center of mass. It is a hypothetical point where entire mass of an object may be assumed to be concentrated to visualise its motion. In other words, the center of mass is the particle equivalent of a given object for application of Newton's laws of motion.

In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid. The center of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe. In the case of a distribution of separate bodies, such as the planets of the Solar System, the center of mass may not correspond to the position of any individual member of the system.

The center of mass is a useful reference point for calculations in mechanics that involve masses distributed in space, such as the linear and angular momentum of planetary bodies and rigid body dynamics. In orbital mechanics, the equations of motion of planets are formulated as point masses located at the centers of mass. The center of mass frame is an inertial frame in which the center of mass of a system is at rest with respect to the origin of the coordinate system.

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Answer: The microwaves are reflected within the metal interior of the oven where they are absorbed by food. Microwaves cause water molecules in food to vibrate, producing heat that cooks the food.

Explanation:

Answer:

B

Explanation:

Answer:  A: the same

Explanation: Based on the field lines, the electric charges indicated by the question marks are the same. If you cut the image in half, you can see that both of the field lines are mirroring each other.

Answer:

The magnitude of swing's tension is 0.71 N.

Explanation:

Given;

mass of the ball, m = 18 g = 0.018 kg

angular speed of the ball, ω = 1 rev/s

radius of the motion, r = 1 m

Angular speed in rad/s is calculated as follows;

[tex]\omega = \frac{2\pi \ rad}{rev} \times \frac{1 \ rev}{s} \\\\\omega = 2 \pi \ rad/s[/tex]

Linear speed of the ball, v;

v = ωr

v = 2π x 1

v = 2π  m/s

The magnitude of swing's tension is calculated as the centripetal force keeping the ball in circular motion.

[tex]F_c =T = \frac{mv^2}{r} \\\\T= \frac{0.018 \ \times (2\pi )^2}{1} \\\\T = 0.71 \ N[/tex]

Therefore, the magnitude of swing's tension is 0.71 N.

Answer:

Explanation:

Answer: None of the above I got it right on my test

Answer:

the answer is C. Children tend to forget events before they were five years old.

Explanation:

The doctor that is hesitant to diagnose him should be considered when the children of the age have the normal lapse which arises prior to the age of 5.

Memory means the capacity to remember anything. It can be the conversation had few days ago or any other things. The more good the memory the more better it is.

Since the child is suffering from dissociative amnesia due to which he is not able to remember some phases of his life.

Hence, based on the above explanation, we can say that the option c is correct.

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Answer:

the answer is 12 second easy

Answer:

um Saturday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday?

Explanation:

Answer:

the energy increases 4 times

Explanation:

A spring has an elastic potential energy that is given by the expression

          K_e = ½ K (x-x₀)²

where x is the distance from the equilibrium point and k is the return constant

if the spring is stretched at  x-x₀ = 2x₀, the energy value

        K_e = ½ k (2x₀)²

        K_e = ½ k 4 x₀²

        K_e = 4 (½ k x₀²)

        [tex]\frac{K_e}{ \frac{1}{2} k x_o^2}[/tex] = 4

therefore the energy increases 4 times

The energy stored in the spring changes by a factor of 4

The formula for calculating the energy stored in the spring is expressed as:

[tex]E=\frac{1}{2}ke^2[/tex]

If the spring is stretched to twice the length of its equilibrium position

[tex]E_2=\frac{1}{2}(2k)^2\\E_2=\frac{1}{2}4k^2[/tex]

Take the ratio of the energy stored in the spring

[tex]\frac{E_2}{E} =\frac{1/2(4kx^2)}{1/2kx^2}\\ \frac{E_2}{E} =\frac{4}{1}\\E_2 = 4E[/tex]

This shows that the energy stored in the spring changes by a factor of 4

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Answer:

fxb

c

Explanation:bfffffffff

Answer:

Explanation:La ecuación de Van der Waals es una ecuación de estado de un fluido compuesto de partículas con un tamaño no despreciable y con fuerzas intermoleculares, como las fuerzas de Van der Waals. La ecuación, cuyo origen se remonta a 1873, debe su nombre a Johannes van der Waals, quien recibió el premio Nobel en 1910 por su trabajo en la ecuación de estado para gases y líquidos, la cual está basada en una modificación de la ley de los gases ideales para que se aproxime de manera más precisa al comportamiento de los gases reales al tener en cuenta su tamaño no nulo y la atracción entre sus partículas.

Answer:

90 N

Explanation:

m = 60 kg

a = 1.5 m/s^2

F = m × a = 1.5 × 60 = 90 N