Tug-of-War During a tug-of-war, team A does 2. 20x105] of work in pulling team B 8. 00 m. What average force did team A exert?

Answer:

B) Friction force

Explanation:

if the object is heavy then it will need more force to move it unlike a tennis ball for example.

Explanation:

The gravity equation defines the relationship between weight, mass, and gravity:

W = mg

Answer:

CO2 increases in the winter

Explanation:

The big bang did not produce a significant proportion of elements heavier than helium because by the time helium could survive, the temperature had become too low for heavier elements to form.

In the field of physics, the big bang can be described as a theory that the universe was created when the hot mass of a ball was stretched enough due to collisions that the entire universe could be formed from it. After this mass of the ball cooled, life came into existence

It was due to the formation of the big bang that life came into existence. Elements that are lighter and do not have much nuclear radioactivity were easier to be formed. However, the formation of elements such as helium required high nuclear fusion reactions to occur. By the time helium became stable after various nuclear fusion reactions, the big bang had already cooled and hence no more heavier elements could be produced.

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Here volume of gas is not given so question is solved assuming volume as 1 L.

The number of moles of 1 L gas present in the sealed container at a

pressure of 125 kPa at 25 degrees Celsius is 0.0067 moles.

The ideal gas law equation can be written as

PV  = nR T

Here

P is the pressure of the gas in atm

V is the volume it occupies in L

n is the number of moles of gas present in the sample

R is the universal gas constant, equal to 0.0821 atm L/ mol K

T is the absolute temperature of the gas in Kelvin

Now, it's important to realize that the units you have for the volume, pressure, and temperature of the gas must match the unit used in the expression of the universal gas constant.

So

P = 125 kPa

1 atm = 760 kPa

P = 125/760 = 0.1644 atm

T = 25 degree celsius  = 25 +273 = 298 K

Taking V  = 1 L

So

n  = PV/RT

n = 0.1644 x 1 / 0.0821 x 298

n =  0.0067 moles

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If the floor were not frictionless, the sphere's angular speed would change and increase until the sliding between the sphere and the floor came to an end. As a result, correct option is C.

When something moves over or rolls over another solid object, there is friction. Even though friction force can be advantageous, such as the traction needed to move without slipping, they also present a sizable amount of resistance to motion.

Friction between alloys appears to be primarily caused by the attraction forces, also called as stickiness, between the contact zones of the surfaces, which are always microscopically unequal. As the defects of the rough surface rub up against the softer surface, the "welded" seams are torn apart and friction is produced.

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The complete question is:

A solid sphere is placed on a frictionless floor in a very long corridor and is given a quick push so that it begins to slide, without rotating, along the corridor. How would the angular speed of the sphere be changing if the floor were not frictionless?

A.) It would remain zero because the net torque is still zero.

B.) It would remain zero because the angular momentum is conserved.

C.) It would be increasing until the slipping between the sphere and the floor stops.

D.) It would be increasing until the linear and the angular speeds become equal.

E.) It would be increasing until the translational motion stops.

A spring of force constant 120 N/m acted up by a constant force of 240N. Then, the elastic potential energy stored in the spring is 240 Nm.

The elastic potential energy stored in the spring is formulated as follows

                                                 PE = ½kx²

Where PE is the elastic potential energy, x is the displacement of the spring from its equilibrium position, and k is the spring force constant.

In this question, the spring force constant is 120 N/m, and the constant force acting on the spring is 240 N. To find the spring displacement, we can use the formula:

F = kx

Where F is the force acting on the spring, x is the displacement, and k is the force constant,

So that:

F = kx

240 N = 120 N/m . x

x = 240 N/120 N/m

x = 2 m

Once x is known, then we can calculate the potential energy of the spring:

PE = ½kx²

PE = ½ (120) (2²)

PE = 60 x 40

PE = 240 Nm

So, the elastic potential energy stored in the spring is 240 Nm.

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The y-values range from -1 to 1. Symmetry about the x-axis finds y-values between 0 and 1 and twice the loudness.

The axis of rotation is x = 3, so the radius is r = 3-x or correct = 3 −3j 2

Now let's set up an integral to find the volume using the disk method.

v = 2 Pi ∫ba

2 i.e.j = 2 Pi 1 0(3 −3j 2)2 i.e.jv = 2 Pi∫1 0( 9 −18j 2 +9j Four)

Finally, integrate and evaluate.

v =2Pi(9j−6j3+9j Five) | |10 v = 3 Pi(9 − 6 +95 )v = 48 Pi 5≒b16.30.

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Answer:

32 m

Explanation:

By energy conservation, total energy at the top of slide must be equal to the total energy at at the bottom.

therefore

mgh = (1/2)mv^2

v^2= 2gh

\(v = \sqrt(2gh)\) ..............(1) i.e., velocity is a function of height of slide.

1st part

Let height of blue slide be H and height of red slide be h.

Let velocity of rider in blue slide= V and red slide= v

At the bottom of slide,

From equation (1)

therefore  

\(\frac{V^{2}}{v^{2}} = \frac{2gH}{2gh}\)

Given, V= 2v  

\(\therefore  \frac{4v^{2}}{v^2{}} = \frac{H}{h}\)

H = 4h

therefore, height of blue slide is 4 times that of red slide= 4*8=32 m

The Biot-Savart law is a fundamental law in electromagnetism that describes the magnetic field produced by a current-carrying wire.

When a current flows through a wire, a magnetic field is generated around the wire. The Biot-Savart law allows us to calculate the magnetic field at any point in space due to a current-carrying wire.

A finite solenoid is a coil of wire wound in a helix shape that has a finite length. The Biot-Savart law can be used to calculate the magnetic field produced by a finite solenoid. The magnetic field of a finite solenoid is similar to that of an infinite solenoid, but with additional end effects.

The formula for the magnetic field produced by a finite solenoid is complex and involves integrating over the length of the solenoid. The magnetic field depends on various factors such as the number of turns in the solenoid, the current flowing through it, and the radius and length of the solenoid. The Biot-Savart law is a crucial tool for understanding and analyzing the behavior of magnetic fields produced by current-carrying wires and is used in various applications in physics and engineering.

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Answer:

Qúéßtîóñ : A quantity of pepper soup of mass 800g poured into a plastic container with a tight fitting lid has a temperature of 30oC. The container is then placed in a microwave oven, rated 1200 W and operated for3 minutes.

(i) Calculate the final temperature attained by the soup. (Assuming no heat losses)

Àñßwër : Pt = mc

1200 x 3 x 60 = x 4000 x

= 67.5o

Final temp = 67 . 5o + 30o

= 97.5oC

(ii) Explain why containers with tight-fitting lids are not suitable for use in microwave cooking.

Àñßwër : The molecules of the steam from the content are confined within the container. As the temperature increases the rate of collision of the molecules with walls of the container increases, thus the pressure inside the container increases. If it is tightly fitted, the pressure can make the container burst thus releasing its hot content.

(iii) When the soup is brought out and allowed to cool, a dent was observed on the container. Explain.[ Take specific heat capacity of the soup = 4000 Jkg-1 K-1 ]

Àñßwër: The container will dent because the condensation of the steam in the container will lead to a decrease in pressure in the container making the atmospheric pressure greater than the pressure in the container.

Explanation:

Electric potential energy Ue is the potential energy stored when charges are out of equilibrium (like gravitational potential energy). Electric potential is the same, but per charge, Ueq. An electric potential difference between two points is called voltage, V=Ue2q-Ue1q.

Answer:

See explanation below

Explanation:

There are multiple differences between electric potential energy and electric potential, but I want to include one major point -

The value of electric potential gives you the amount of work that needs to be done. This can be translated into a formula where the charge q has a potential energy of Vq with a potential of V - at a set distance r. Thus, electric potential is represented by V ( Volts ),

V = kq / r

_______________________________________________________

Electric potential energy is represented by U rather than V. Two charges are set with distance r,

U = k( q1 )( q2 ) / r

Hope that helps!

Answer:

See below    ( was it REALLY 1/4 INCH??)

Explanation:

Calculate the volume of the sphere

v = 4/3 pi r^3

 this times the density of the oil will give g displacement

   then f = ma

4/3 pi (.25 in  * 2.54 cm/inch) ^3  * .961 = 1.0307 gm

1.0307 gm   is   .0010307 kg

f = ma = .0010307 * 9.8 = .0101 N

Answer:

I'm pretty sure its 1080

Explanation:

force is = to mass multiplied by acceleration.

So 900 kg multiplied by 1.2m/s is = to 1080

I'm no expert so please tell me if I'm wrong so that I can improve.

Have fun buddy .

Answer: some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement. Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure. Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given. While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Explanation:

Answer:

Wouldn't it be great to make nearly $111 million a year simply to play a game? Tiger Woods, along with many other professional athletes, certainly think so. But do these athletes really deserve all that money?

In my mind, absolutely not. Professional athletes are making too much money in a society where salaries and wages are traditionally based on the value of one's work. In today's society, one should be paid according to the job’s economic importance and their value to society.

Teaching is one of the most economically important occupations because our future economy relies on the education of its youth, yet teachers are paid astronomically less than the average professional athlete is. In fact, each basket Kobe Bryant scores earns him equivalent to the average classroom teacher’s yearly salary.

However, some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement.

Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure.

Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given.

While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Moreover, in my mind, if these athletes want to continue to be rewarded with the fame and fortune that is unfairly bestowed upon them, they must prove to the world that they are going to be positive role models for future athletes, and those who admire them.

Explanation:

found if off some website lol hope it helps! <3

The strength of the magnetic field at the centrer of coil is calculated to be 1.97× 10⁻⁷ Tesla

A magnetic field is a vector field that explains the magnetic impact on moving charges, currents, and magnetic materials. A moving charge in a magnetic field is subjected to a force that is perpendicular to both its own velocity and the magnetic field.

We know that for a circular wire the magnetic field at the center is given by

B= μI/2r

Here, μ= 4π×10⁻⁷

I= current flowing= 0.15A

r= radius of the circular wire

In the given question the wire of length 3m is bent into a circular coil of one turn.

So, the circumference of coil will be equal to the length of the coil.

Length= circumference= 2πr

2πr= 3m        (π≅3.14)

r=  \(\frac{3}{2* 3.14}\)= 0.477 m

Now putting the value of r= 0.477 m in magnetic field formula we get

B= \(\frac{4\pi }{2* 0.477}\)×10⁻⁷

B= 1.97× 10⁻⁷ Tesla

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The angular displacement is given by the function A(t) = 0.11 cos(4t), where A is the angular displacement from the vertical in radians and t is the time in seconds.

So, the rate of change of angular displacement can be obtained by finding the derivative of A(t). Therefore, the derivative of A(t) with respect to t is given by:

dA/dt = -0.44 sin(4t)

At t = 5 seconds,

dA/dt = -0.44 sin(45)

= -0.44 sin (20)

= -0.44 × 0.9129

= -0.4017

Therefore, the rate of change of A at 5 seconds is approximately -0.4017. Therefore, option B is correct. Note: The given function A(t) is equivalent to A(t) = Amax cos(t), where Amax is the amplitude of the oscillation and ω is the angular frequency of the oscillation.

The angular frequency ω is related to the frequency f and the period T of the oscillation as follows:

ω = 2πf

= 2π/T. In the given problem, the frequency f is equal to 2 Hz (since ω = 4) and the period T is equal to 1/2 second.

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Answer:

6.37*10^6 m

Explanation:

We know that,

g = GM/R²

values given to us

acceleration due to gravity = g = 9.8 m/s²

Mass of the earth is= 6.4*10^24

G = 6.67*\(10^{-11}\)

implementing

9.8 = 6.67*10^-11 * 6*10^24/R^2

9.8 = 40.02 * 10^13/ R^2

R^2 = 4002/98 * 10^12

R^2 = 40.83* 10^12

R= 6.37*10^6 m   (approximately)

Answer:

A

Explanation:

The energy required to make one He-3 nucleus is 3.27 MeV.

The formation of He-3 can occur through several nuclear reactions, including the fusion of two deuterium nuclei, the decay of tritium, and the capture of a neutron by He-3. The energy required to make one He-3 nucleus varies depending on the specific reaction that is taking place.

However, the fusion of two deuterium nuclei, which produces He-3 and a proton, is one of the most common and energy-efficient reactions used to create He-3. This reaction requires an energy input of 3.27 MeV (mega-electron volts) to overcome the electrostatic repulsion between the positively charged deuterium nuclei and bring them close enough together for the strong nuclear force to take over and fuse the nuclei.

Regarding the balance of nuclear equations, all nuclear reactions must obey the laws of conservation of mass and conservation of charge. This means that the sum of the mass numbers and the sum of the atomic numbers (proton numbers) must be equal on both sides of the equation. Therefore, nuclear equations must be balanced to ensure that the same number of positive charges and the same mass are present on both sides of the equation.

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Answer:

the answer for how much work was done is 90

Work done to push a box is 150 J.

force= 30N

displacement= 5 meters.

work done= 30 * 5

               ⇒ 150 joule.

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Answer:

True

Explanation:

Modulation waves(schemes) can be analog or digital. An analog modulation scheme has an input wave that varies continuously like a sine wave.

Answer:

997 kg/m³

Explanation:

Answer:

997 kg/m³

Explanation:

Answer:

Distance 14

Displacement 10

Explanation:

The melting point of a substance is the temperature at which the substance changes its phase from solid to liquid.

The freezing point is the temperature at which the substance changes its phase from liquid to solid.

The melting point of a substance is the same as the freezing point. That is when the temperature of the substance in the liquid form is increased continuously, the temperature at which the substance turns into a solid is equal to the temperature at which the substance will turn into liquid from solid if the temperature is decreased continuously, from a higher temperature.

Answer:

Average speed = 53.33 km/h

Explanation:

Below is the calculation for the average speed:

Given the average speed of for first 40 km = 80km/h

Time taken to cover the first 40 km = Total Distance / average speed

Time taken to cover the first 40 km = 40 / 80 = 0.5 hours

Given the average speed of for next 40 km = 40km/h

Time taken to cover the next 40 km = Total Distance / average speed

Time taken to cover the next 40 km = 40 / 40 = 1 hours

Now the average speed of the tuck to cover total distance:

Average speed = Total distance / Total time

Average speed = (40 + 40) / (0.5 + 1)

Average speed = 53.33 km/h

The correct answer is option C.

Maxwell right hand thumb rule: if we hold a current carrying conductor in our right hand such that the thumb indicates the direction of current then the curling of fingers shows the direction of magnetic field around the conductor.

Here the current is counterclockwise so by use of Maxwell right hand thumb rule the direction of magnetic field is straight up.

Using Fleming right hand rule that States that if the fore-finger, middle finger and the thumb of left hand are stretched mutually perpendicular to each other, such that fore-finger points in the direction of magnetic field, the middle finger points in the direction of the motion of positive charge, then the thumb points to the direction of the force.

So, the current, when viewed from above, seems to move around loop in counterclockwise direction points straight up is because of Maxwell's Thumb Rule.

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The wavelength is 6.04 nm.

since

λ=hc/E

λ=6.626×10^ −34×3×10 ^8/(3.29×10−19)

λ=6.04nm

The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal carried in space or down a wire is defined as the wavelength. This length is often defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

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Answer:

i dont know

Explanation:

hello

Answer:

calculus I believe soo