A sprinter accelerates from rest to 10.0 m/s in 1.35 s l. What is her acceleration?

The person's legs exert a force on his torso during deceleration equivalent to the work they must do to bring his torso's kinetic energy to zero. This force can be calculated using the relationship between work and energy and the mass, height of the fall, and distance over which the force is applied.

To find the magnitude of the average force exerted on the person's torso by his legs during deceleration, we need to use the relationship between work and energy, specifically the work-energy theorem. This theorem states that the work done on an object is equal to the change in its kinetic energy.

When the person jumps from the roof, he gains kinetic energy equal to the gravitational potential energy he loses, which can be calculated as mgΔh, where m is the mass of the torso (45 kg), g is the acceleration due to gravity (9.8 m/s²), and Δh is the height of the fall (3.5 m).

This kinetic energy becomes zero when the person's legs decelerate his torso to a stop. The work done by the legs in this process is therefore equal to the kinetic energy the torso had initially, which gives a force F according to the equation W = F⋅d, where W is the work and d is the distance over which the force is applied (0.71 m).

Solving for F we find the average force exerted by his legs during deceleration.

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The problem is about calculating force exerted on a person's torso when he jumps from a certain height. Initially the gravitational potential energy of the person is converted to kinetic energy, and then dissipated as work done when he bends his knees to decelerate. The force can be calculated by first calculating deceleration and then using F=ma, where m is the mass of the torso and a is the deceleration.

The subject of your question involves calculating the force exerted on a person's torso by his legs during a jump from a certain height. This is a physics problem related to gravitational potential energy, kinetic energy, and work. Initially, when the person is on top of the roof, the entire energy of the system is gravitational potential energy which can be calculated by the formula: PE = mgh. When the person jumps and hits the ground, this energy transforms into kinetic energy. However, this kinetic energy is not immediately dissipated. Instead, the person bends their knees and decelerates over a certain distance, which implies that the energy is dissipated over a certain period of time or work done. This work done can be calculated by the formula: W = -KE = mgh. The force can therefore be calculated using the formula: F = ma, where a is the deceleration. The deceleration can be obtained from the relation between displacement, initial velocity, final velocity, and acceleration which is (final velocity^2) = (initial velocity^2) + 2*a*d. Here, initial velocity is the velocity with which the person hits the ground and the final velocity is zero as the person completely stops and 'd' stands for the distance over which the person decelerates.  Once 'a' is calculated, it can be substituted into the equation F = ma to find the force.

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This is a false statement. Newton's first law says that if the net force on an object is zero, the object stays in UNIFORM MOTION. That means it keeps moving at a constant speed, in a straight line. It can certainly have some speed, in some direction, but without any net force, they CAN'T CHANGE.

The baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.

Explanation:

It is known that speed is the rate at which any object covers a particular distance.

So [tex]speed =\frac{\text { distance }}{\text { time }}[/tex]

Hence, it is known that speed is directly proportional to distance covered and inversely proportionate to the time taken to cover this distance.

Similarly, the time taken by any object to cover a distance is directly proportionate to the distance and inversely proportionate to the velocity of the object.

As the distance is given as 20 m and speed is given as 25 m/s, then the time can be easily obtained by finding the ratio of distance to speed.

Here,

          [tex]\text { Time }=\frac{\text {distance}}{\text {speed}}=\frac{20}{25}=0.8 \mathrm{s}[/tex]

Thus, the baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.

Answer:

A Brief burst of intense exercise

Explanation:

Apex

Answer:

[tex]44.27m/s[/tex]

Explanation:

The kinematic equation

[tex]v_f^2=v_0^2+2ad[/tex]

gives the final velocity [tex]v_f[/tex] of the object given the initial velocity [tex]v_0[/tex], the acceleration [tex]a[/tex], and the distance traveled [tex]d[/tex].

For our case, the object is dropped; therefore,

[tex]v_0=0[/tex]

I.e. the initial velocity is zero. The acceleration due to gravity is

[tex]a=9.8m/s^2[/tex],

and the distance traveled is [tex]d=100m[/tex].

Putting the values into the equation we get:

[tex]v_f^2=0+2(9.8ms^{-2})(100m)\\\\v_f^2=1960\\\\v_f=\sqrt{1960} \\\\\boxed{v_f=44.27m/s}[/tex]

The final velocity of the object is 44.27 m/s.

Answer:

the chemical energy of the fuel is transformed into the mechanical energy

Explanation:

got it right on USAtestprep

When pressing the accelerator on a car, the chemical  energy of the fuel is transformed into the mechanical energy that makes the car move.

Energy can neither ne created nor be destroyed. But it can be transformed from one form to the other.  The energy transformation does not make any energy loss and the total energy is conserved always.

For instance in batteries, the chemical energy by electrolysis is converted into the electrical energy and which is passed into the electrical devices. This electrical energy further converted to mechanical energy to work fan, motors etc.

When pressing accelerator of the car, the chemical energy released from the combustion of the fuel is converted into the mechanical energy that drives the car ahead.

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Answer: A. 1.77x10-² N

Explanation: Newton's Law of Universal gravitation is expressed in the following formula:

F= G x ( m1 x m2 ) / r²

= 6.673x10-¹¹ N.m²/kg² ( 2.0x10⁴ kg x 3.0x10⁴ kg) / (1.5m )²

= 0.0177 N or 1.77x10-² N

Answer:

It is easier to move empty cart than of moving 20 empty carts because of surface that can affect balancing the carts in same array which makes the carts of array to move in different directions.

Final answer:

It's easier to get one empty cart moving than 20 because a single cart has less inertia and friction to overcome compared to the combined inertia and friction of 20 carts.

Explanation:

The question you've asked pertains to the subject of physics, specifically the principles of inertia and momentum. Inertia is the tendency of an object to resist changes to its state of motion. When you have one empty cart, the inertia is relatively low compared to a line of 20 empty carts. Therefore, it requires less force to get one cart moving than 20 carts because the combined inertia of all the carts is greater, hence more force is needed to overcome it.

In addition to inertia, frictional forces also play a part. Each cart adds its own frictional resistance to the total system. Thus, when you try to push 20 carts, you're trying to overcome the frictional force of 20 sets of wheels on the surface as opposed to just one. This makes it substantially more difficult to get the line of carts moving compared to just one cart.

Answer:

25J

Explanation:

Kinetic energy = 1/2 mv²

Mass = m= 0.5kg

Velocity = v = 10m/s

K. E = 1/2 x 0.5 x 10 x 10

K. E = 0.5 x 5 x 10

K. E = 2.5 x 10

K. E = 25 J

The S. I unit of energy is joules with symbol J

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Answer:

A.) 25j

Explanation:

k= 1/2mv^2

B) 37 V

The potential difference between point a and point b is equal to 37 V

The potential difference across a and b can be calculated by finding the equivalent resistance of the resistors R1, R2 and R3 and then by applying Ohm's law.

Given:

R1 = 3.0 Ω

R2 = 8.0 Ω

R3 = 10.0

Current = I = 5 A

To calculate equivalent resistance of the circuit:

R2 and R3 are connected in parallel configuration. The equivalent resistance of R2 and R3 can be calculated as

[tex]\frac{1}{R_p} =\frac{1}{R_2} + \frac{1}{R_3} \\\\\frac{1}{R_p}=\frac{1}{8} + \frac{1}{10}= \frac{5+4}{40} = \frac{9}{40} \\\\ \frac{1}{R_p}=\frac{9}{40} \\\\R_p=\frac{40}{9}\ ohms[/tex]

Resistance R1 is in series with Rp. The equivalent series resistance is calculated as

[tex]R_s = R1+R_p = 3+\frac{40}{9}= \frac{27+40}{9} = \frac{67}{9} = 7.44\ ohms[/tex]

Thus the given 3 resistor circuit can be written as an equivalent resistance Rs equal to 7.44 Ω through which current I passes.

By Ohm's law;

If V is the potential difference between a and b

Potential difference across points a and b = Current flowing through the circuit × Resistance between points a and b

[tex]V = I\times R_s = 5\times 7.44 = 37.2\ V[/tex]

37.2 V ≈ 37 V

Therefore, the potential difference between point a and point b is equal to 37 V

Answer:

Explanation:

37V

Earth is surrounded by a magnetic field because of the rotating electric currents by the charged metallic particles in the earth crest.

On earth, electric currents are produced by the movement of liquid metal in the planet's outer core. These electric currents combine to create a magnetic field that surrounds the globe as a result of Earth rotating on its axis.

The magnetic field is crucial to keeping life on Earth alive. Without it, we would be exposed to a lot of solar radiation and our atmosphere would be unrestricted in its ability to escape into space.

A stream of charged particles emerging from the sun, interacts with the magnetic field that stretches from the interior of the earth into space. Electric currents caused by the movement of convection currents of a combination of molten iron and nickel in the earth's outer core produce the magnetic field.

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The correct option is option A.

According to the universal gas equation, the product of the pressure and volume of a gas is directly proportional to the product of the number of moles of gas and the absolute temperature of the gas.

So PV is proportional to nT.

Here, it's said that the temperature of the gas is constant. And inside a tube, the volume of the gas remains constant.

So the pressure of the gas will be directly proportional to the number of moles of gas. So as the number of moles of the gas rises, the pressure of the gas also rises. So, with addition of more gas into tyre, the pressure of gas will also increase.

Answer:

a

Explanation:

gradpoint gang

Answer:

4. hours to travel 350km going at a rate of 80km/hr.

Explanation:

Well first you must divide 350/80=4.375~4.

Answer: 4.375 hours

Explanation:

350 divided by 80 = 4.375

Answer:

12,750

Explanation:

P = mv

Momentum = Mass x Velocity

Plug it in and finish equation

Answer:

P=12,750kgm/s

Explanation:

Momentum (P) = mass x velocity

Where velocity =15m/s

Mass=850kg

Therefore, momentum(P) = (850kg) x (15m/s)=12,750kgm/s

Hence,the momentum of the train is 12,750kgm/s

formula for wavelength = speed/frequency

So 1500/200 = 7.5 meters

The wavelength of the wave is 7.5m.

The wavelength of light is described as "the distance between two consecutive peaks or troughs of a light wave" which is denoted by the Greek letter lambda (λ). Therefore, the distance between one crest or trough of one wave and the next wave is known as wavelength.

Wavelength can be expressed as:

[tex]\lambda=\frac{v}{f}\\\lambda = wavelength\\{v} = velocity\\{f} = frequency[/tex]

λ represents wavelength which is expressed in meters. The v is wave velocity that is calculated as meters per second (mps) and the f stands for frequency, which is measured in hertz (Hz).

For above given information,

speed of a wave is 1500 m/s

frequency is 200 Hz

So, wavelength= 1500/200= 7.5m

Thus, the wavelength of the wave is 7.5m.

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Which statements describe the Mercalli scale? Check all that apply.

A. This scale measures seismic waves based on their size.

B. This scale rates an earthquake according to how much damage it causes.

C.This scale produces a single rating for earthquakes that reach the surface.

D. This scale uses Roman numerals to rank the damage caused by an earthquake.

E.This scale measures the magnitude of an earthquake based on the size of seismic waves.

The Mercalli scale : This scale rates an earthquake according to how much damage it causes and This scale uses Roman numerals to rank the damage caused by an earthquake.

The Modified Mercalli scale is intended to illustrate the consequences of an earthquake, at a contracted station, on tangible characteristics, on modern fittings and human beings.

The Modified Mercalli Intensity value ascribed to a particular site subsequent an earthquake has an extra significant means of severity to the nonscientist than the magnitude because intensity assigns to the outcomes really encountered at that position. This scale is comprised of 12 growing levels of intensity, denoted by Roman numerals, arranging from gradual shaking to catastrophic impairment.

Answer:

The less distance between the objects, the more force there is between them.

Relationship between the gravitational force and distance shown in the graph is

>increases, decreases.

As most gravitons exist in a cloud around any object so when distance from the object increases, the density of the graviton cloud goes decreases. There is less gravitational attraction due to this.

The relationship between the force of gravity and distance between the objects is explained by inverse square law. This implies that the force of gravity between objects is inversely proportional to the square of the distance.

Any influence that causes an object to undergo a change is called force. Distance implies how far an object travels over a period of time. When the force applied is greater on an object, it will travel more distance.

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Answer:

Fields

Explanation:

The presence of a magnet's magnetic field best explains why a magnet can act at a distance on other magnets or objects containing certain metals. The magnetic field is an invisible force field that extends from the magnet, wherein other magnets or certain metals are influenced.

The feature of a magnet that allows it to act at a distance on other magnets or on objects containing certain metals is its magnetic field. A magnet's magnetic field is an invisible force field that extends out from the magnet in a pattern similar to the pattern formed by evenly spaced, radiating lines. Within the magnetic field, other magnets or certain metals are pushed or pulled by the magnetic force. For example, if you slowly bring a piece of iron closer to a magnet, you will feel the iron being attracted towards the magnet even before it physically touches the magnet. That's the magnetic field in action.

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Final answer:

The statement is true; atoms with electronegativity differences below 0.4 typically form covalent bonds, with a bond being considered nonpolar covalent when the electronegativity difference is less than 0.4.

Explanation:

The statement that atoms with electronegativity differences below 0.4 generally form covalent bonds is true. In chemistry, the electronegativity difference between bonding atoms is a determinant of the type of bond they will form. If the difference in electronegativities is less than about 0.4, the bond is typically considered nonpolar covalent, where the bonding electrons are shared equally between the two atoms, and the distribution of electrical charge is balanced. When the electronegativity difference is between 0.4 and about 1.7, the bond is classified as polar covalent, meaning electrons are not shared equally, leading to a partial charge distribution within the molecule.

An electronegativity difference of zero indicates an absolute nonpolar covalent bond, while significantly higher differences (usually greater than about 1.8) suggest the bond will be ionic in character, where electrons are transferred from one atom to another, resulting in the formation of ions.

Answer: 4N downward

Explanation: If 16N is applied on both the right and left then the object isn't moving either way, so we are left with 4N.

"The net force on the object is 4N downward.

To find the net force acting on the object, we need to consider the vector sum of all the individual forces. Forces acting in opposite directions (to the right and to the left in this case) will cancel each other out.

Given the forces:

- 16N to the right

- 16N to the left

- 4N downward

Since the forces to the right and to the left are equal in magnitude (16N), they will cancel each other out. This leaves us with only the downward force to consider for the net force.

Therefore, the net force [tex]\( F_{net} \)[/tex]is simply the downward force:

[tex]\[ F_{net} = 4N \text{ (downward)} \][/tex]

The horizontal components of the force (to the right and to the left) have no net effect on the object's motion because they are equal and opposite, so they sum to zero in the horizontal direction. The only unbalanced force is the 4N acting vertically downward. Hence, the net force on the object is 4N downward."

Answer:

C. positron

Explanation:

Antimatter particles bind with each other to form antimatter, just as ordinary particles bind to form normal matter. For example, a positron (the antiparticle of the electron) and an antiproton (the antiparticle of the proton) can form an antihydrogen atom.

There you go.

Answer:C. positron

Explanation:

Answer:

A

Explanation:

Transformation rule : The coordinates change by the rule when the figure rotate 90 degrees about the origin is given by

[tex](x,y)(-y,x)[/tex]

Transformation rule: When the figure reflected across x- axis then the coordinates change by the rule

[tex](x,y)(x,-y)[/tex]

The given figure cut x - axis at x=3

The coordinates (3,0).

After 90 degrees rotation about origin the coordinates becomes (0,3).

After reflection across x- axis , the coordinates becomes (0,-3).

Only in first figure, there is (0,-3) .

Hence, the option A is true.

Answer:

Resistor

Explanation:

Resistors are measured in ohms . So one ohm is the amount of resistance that opposes current flow from one part of a circuit to another. The voltage v is directly proportional to the current I so , V= IR

Resistance R =

voltage v/ current I

Nichrome is a mixture of nickel and chromium. Nichrome Wire is highly resistant to the flow of electricity . This resistance causes an increase in generated heat . It also has the ability to be heated many times without being destroyed. It is is a mixture of nickel and chromium.This heat is powerful enough to heat the water without damaging the wire.

Nichrome wire's high resistance to electric current causes it to heat up and transfer heat, its resistance can be calculated using Ohm's Law, and it draws power when initially switched on.

Nichrome wire is used as a heating element in heaters due to its high resistance to electric current, which causes it to heat up and transfer that heat to its surroundings. When electricity flows through a conductor like nichrome, heat is generated as a result of the resistance to the flow of electrons.

The resistance of the Nichrome wire can be calculated using Ohm's Law, knowing the power output and voltage supplied. Additionally, the length of the Nichrome wire needed can be determined based on its cross-sectional area and operating temperature.

When first switched on, the Nichrome wire heating element will draw a certain power as it starts to heat up until it reaches its operating temperature and stabilizes.

Answer: Option A. They follow a repeating pattern as they propagate

Explanation:

Answer:5990 kj

Explanation:

Assume they weigh the same: If Sally is pushed harder than Bill,  Bill would come back sooner, Bill has a greater amplitude.  Assume Bill is heavier than Sally: If both are pushed equally hard, Bill would come back sooner, Sally has a greater amplitude

Explanation:

The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.

In simpler terms, amplitude stands for the maximum extent of a vibration or oscillation, measured from the position of equilibrium. Amplitude is proportional to the energy of a wave, a high energy wave having a high amplitude and a low energy wave having a low amplitude.

Answer:

C. The provider's success claims seem too good to be true.

The heat required to change 1.25 kg of steak is 2825 kJ /kg.

Explanation:

Given, mass m = 1.25 kg,     Temperature t = 100 degree celsius

To calculate the heat required,

                                 Q = m [tex]\times[/tex] L

where m represents the mass in kg,

          L represents the heat of vaporization.

When a material in the liquid state is given energy, it changes its phase from liquid to vapor and the energy absorbed in this process is called heat of the vaporization. The heat of vaporization of the water is about 2260 kJ/kg.

                                  Q = 1.25 [tex]\times[/tex] 2260

                                  Q = 2825 kJ /kg.

Answer:

Turbines in coal factories

Explanation:

Turbines in coal factories use steam power to move the turbine flaps and generate static electricity as energy output.

Explanation:

a machine or a device that transfers the motion of a hot gas to motion of an object is a rocket ship.