a student is measuring the effects of an electric circuit on a compass, and he is testing to see if increasing the current will cause the compass needle to change its direction faster. he does one trial using a 9-volt battery and another trial using a 1.5-volt battery. he takes accurate data. based on good experimental design, what would improve his experiment? he should add a non working compass to act as a control. he should add a non working compass to act as a control. he should use batteries of the same voltage but from different manufacturers to show he has used different variables. he should use batteries of the same voltage but from different manufacturers to show he has used different variables. he should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results. he should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results. he should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups. he should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups.

0.81 km far east she walked.

The ratio of the sum of quantities to the entire number of quantities is what is simply meant by the word "average." In Physics, an alternative strategy is used. Let's first define velocity precisely as well as speed and how the two are related before moving on to average velocity. The change in location of an object with respect to time is referred to as its speed. On the other hand, velocity is nothing more than the speed that is specified in relation to the direction that an item travels. For now, let's return to the average velocity before we get into further detail regarding the distinction between speed and velocity.

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According to the question a plastic rod that has been charged to − 15nc touches a metal sphere. Afterward, the rod's charge is − 1.0nc.The electrons will be transferred from the plastic rod to the metal sphere and the number of electrons ( n ) = 8.73 * 10^10

First of all, write the initial charge on the plastic rod, and then it touches the metallic sphere. Then, a few amounts of charge are transferred to the steel sphere. Later, calculating the price difference between the plastic rod and metal sphere, the kind of charged particle transferred may be decided. Ultimately, the number of electrons may be calculated by the use of the overall charge and the rate of the electron.

The expression of the total charge in electrostatics is Q = ne

Q = charge

n = number of electrons

e = charge of the electron

The initial charge on the plastic rod ( Qplastic ) = -15nC

Final charge on the metal sphere after it was touched by the plastic rod ( Qmetal ) = -1nC

The charge transferred from the metal rod to the sphere = ( Q = Qplastic -   Qmetal )

Therefore Q = - 15nC - ( -1nC )

Q = -14nC

The plastic rod is negatively charged, so the electrons will be transferred to the metal sphere. The electrons will be transferred from the plastic rod to the metal sphere.

The expression of the total charge in electrostatics is Q = ne

The expression for n = Q / e

Q = -14nC

The charge on 1 electron = 1.602 * 10^-19 C.

Number of electrons ( n ) = -14nC ( 10^-9C/1nC ) / -1.602 * 10^-19 C.

Number of electrons ( n ) = 8.73 * 10^10

Threfore the number of electrons ( n ) = 8.73 * 10^10

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The speed does the Earth-based observers measure for the approaching landing craft is 1.016 times the speed of light.

To find the answer, we have to know about the Lorentz transformation.

It is given that, an alien spaceship traveling at 0.600 c toward the Earth, in the same direction the landing craft travels with a speed of 0.800 c relative to the mother ship. We have to find the speed do the Earth-based observers measure for the approaching landing craft.

                  [tex]V_x=V_x'(1-\frac{VV_x}{c^2} )+V\\where,\\V_x'=0.8c\\V=0.6c[/tex]

             [tex]V_x=0.8c(1-\frac{0.8c*0.6c}{c^2} )+0.6c=1.016c[/tex]

Thus, we can conclude that, the speed does the Earth-based observers measure for the approaching landing craft is 1.016 times the speed of light.

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Mitochondria is a type of organelle in the athlete’s cells supplies the energy for cellular function.

Since mitochondria are the cellular organelles in charge of producing aerobic ATP, the "health" of mitochondria is crucial for proper cellular operation

Mitochondria. Dictionary Britannica, Inc. Mitochondria, or "powerhouses," are oval-shaped organelles that are present in the majority of eukaryotic cells. During cellular respiration, substances like glucose are converted by mitochondria into ATP, an energy molecule (adenosine triphosphate).

The generation of ROS by mitochondria can result in oxidative damage to mitochondrial proteins, membranes, and DNA, impairing their capacity to synthesize ATP and perform a wide range of metabolic processes, including the tricarboxylic acid cycle, fatty acid oxidation, the urea cycle, amino acid metabolism, haem synthesis, and FeS center assembly, which are crucial to the normal functioning of most cells. The tendency of mitochondria to release intermembrane space proteins, such as cytochrome c (cyt c), to the cytosol by mitochondrial outer membrane permeabilization (MOMP), and so trigger the cell's apoptotic machinery, can also be increased by mitochondrial oxidative damage. The mitochondrial permeability transition pore (PTP), which opens up the inner membrane to tiny molecules in conditions like ischaemial reperfusion damage, is also induced by mitochondrial ROS generation. So it should come as no surprise that mitochondrial oxidative damage plays a role in a variety of diseases. Additionally, mitochondrial ROS may behave as a modifiable redox signal, impacting a number of activities in the mitochondria, cytosol, and nucleus in a reversible manner.

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Answer: 1.2 x 10^7kg

Explanation:

Volume of tank = length x width x height

Volume = 51 x 20 x 11

Volume = 11220 m^3

Density = Mass/Volume

Density = 1030 kg/m^3

Volume = 11220 m^3

Mass = m

1030 = m/11220

m = 1030 x 11220

m = 11,556,600 kg or 1.2 x 10^7kg

The charge per unit length on the outer surface is [tex]3\lambda[/tex]

Charge per unit length of the wire [tex]= {\lambda}[/tex].

Charge per unit length of the cylinder =[tex]{2\lambda}[/tex]

Gauss's law is a principle that connects the distribution of electric charge to the resulting electric field. In its integral form, it asserts that the flux of the electric field out of any closed surface, regardless of how that charge is distributed, is proportional to the electric charge enclosed by the surface.

The total charge per unit length of the cylinder is equal to the charge per unit length of the inner part of the cylinder plus the charge per unit length of the outer part:

Solve for [tex]{\lambda_{\text{out}}}[/tex] :

[tex]\lambda_{\text{out}}=2\lambda-\lambda_{\text{in}}[/tex]

Substitute for [tex]{\lambda_{\text{in}}}[/tex] :

[tex]\lambda_{\text{out}}&=2\lambda-(-\lambda)\\ &={3\lambda}}[/tex]

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Collin can use stoichiometry chemistry to determine the mass of the s'more using this information.

The study of quantitative ratios or relationships between two or more substances undergoing a physical change or a chemical change is known as stoichiometry (chemical reaction). The word is derived from the Greek words "element" and "metron" in the Greek language (meaning "to measure"). Calculations involving stoichiometry typically involve the mass or volume of products and reactants.

The law of conservation of mass, which holds that matter cannot be generated or destroyed but can only be changed from one form to another, is explained by the basic mathematical principle of stoichiometry. A chemical reaction needs a balanced stoichiometry in order to start and proceed to completion.

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It is proved for gravitational radius that Rg=GMs/c^2 .

Given,

The mass of sun = Ms

Sphere of radius = Rg

Sun collapses to a sphere such that the work required to remove a small mass (m) from the surface would be equal to its rest energy mc^2 .

The given radius (Rg) is called as gravitational radius for sun.

We know,

gravitational potential energy Ug = G ×Ms×m/Rg

given, the rest energy, E =mc^2

As it is given that work required to remove small mass is equal to rest energy,

thus, Ug=E

G×Ms×m/Rg = mc^2

Rg =GMs/c^2

Hence, it is proved for gravitational radius that Rg=GMs/c^2 .

Total work done in assembling bodies together,in their respective places, is called gravitational potential energy of the system.

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The type of energy that does not describe potential energy being changed into kinetic energy is the energy that exists in the Compression of the spring.

Usually, in many energy sources, the potential energy is changed into kinetic energy but no such energy transmission takes place when a spring is compressed.

Potential energy is considered as the stored energy occupied by an object or system by virtue of its respective position or by the arrangement of parts. However, this energy is not affected by the environment existing outside of the system or subject including air or height. Potential energy is changed into kinetic energy is also not described in the compression of rubber foam.  

On the other hand, the term kinetic energy is termed as the energy of a particular object or particle of a system that is in motion. Contrary to several peculiarities of potential energy, the kinetic energy of a particular object is in relative position to other stationery as well as moving objects present in its own environment which is an immediate type. In general, the kinetic energy of an object will be of higher value if the object is placed at a distance of greater height.  

If we take the case of Potential energy, it is not all transferrable in nature and will depend on the height or the distance and also the mass of the object. On the other hand, Kinetic energy can be easily transferable from one moving object to another which includes the vibrational and rotational types of energy and it depends on the speed, velocity, and mass of the object.

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The momentum of the pellet just before it hits the modelling clay is 0.0816 kg-m/s the velocity of the pellet just before it hits the modelling clay is 40m/s.

Assumption:

1)the pallet embeds into the clay.

A perfectly inelastic collision is one where the two objects that collide together become one object, losing the maximum amount of kinetic energy.

e=0

In perfectly inelastic collision the momentum is conserved.

given:

velocity of the truck + clay = 0.8m/s

mass of the truck + clay = 0.1 kg

mass of the pallet = 2g=0.002kg

a)

now since the example is of perfectly inelastic collision the momentum will be conserved .

i.e. momentum before collision  = momentum after collision

momentum of pallet =  momentum of( truck + clay)

momentum of pallet = (0.1+0.002)×0.8

momentum of pallet =0.0816 kg-m/s

b)

momentum before collision= mass of pallet ×velocity of pallet  + mass of truck × velocity of truck

velocity of pallet =0.0816/0.002

velocity of pallet =40m/s

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The magnitude of the magnetic moment due to the electron's motion is [tex]87.87 * 10^{-37}[/tex].

The magnetic pull and direction of a magnet or other object that produces a magnetic field are referred to as the magnetic moment in electromagnetism. Things that have magnetic moments include electromagnets, permanent magnets, various compounds, elementary particles like electrons, and a number of celestial objects (such as many planets, some moons, stars, etc).

The term "magnetic moment" really refers to the magnetic dipole moment of a system, which is the portion of the magnetic moment that can be represented by an equivalent magnetic dipole or a pair of magnetic north and south poles that are only very slightly apart. The magnetic dipole component is adequate for sufficiently small magnets or over sufficiently large distances.

Calculations:

radius= [tex]5.29 * 10^{-11} m\\[/tex]

velocity=[tex]2.9* 10^{6} m/s[/tex]

Working formula, M=N/A

[tex]I=\frac{charge flow }{time taken} =\frac{e}{time taken\\}[/tex]

[tex]T= \frac{2xr}{v} =\frac{2xx * 5.29 * 10^{-11} }{2.9* 10^{6} }[/tex]

   =[tex]15.16 * 10^{-5} s[/tex]

[tex]I= \frac{1.6 * 10^{-19} }{15.16 * 10^{-5} }[/tex][tex]= 0.10 * 10^{-14}[/tex]

                     =[tex]1 * 10^{-15} C[/tex]

M=[tex]1x (1* 10^{-15} * (5.29 * 10^{-11} )^{2}[/tex]

  =[tex]87.87 * 10^{-37}[/tex]

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The force required to accelerate the block is 28 N.

The acceleration of a cart with a mass of 25 kg and applied force of 50 N is 2 m/s².

The mass of a block of ice that is accelerated to 6 m/s2 by a force of 3 Newtons is 0.5kg.

A free body diagram is a sketch of forces acting on an object. It consists of the applied force, weight of the object, frictional force and normal reaction.

The force required to accelerate the block is calculated as follows;

F = ma

F = 3.5 kg x 8 m/s²

F = 28 N

The acceleration of a cart with a mass of 25 kg and applied force of 50 N is calculated as follows;

a = F/m

a = 50/25

a = 2 m/s²

The mass of a block of ice that is accelerated to 6 m/s2 by a force of 3 Newtons is calculated as follows;

m = F/a

m = 3 N / 6 m/s²

m = 0.5 kg

A free body diagram is a sketch of forces acting on an object. It consists of the applied force, weight of the object, frictional force and normal reaction.

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V or total voltage is 6 volts because when multiple power supplies of the same voltage are connected in parallel, the applied voltage is same and the current equally divides between the number of power sources.

Divide I(t) or total current 0.25 amps between the two power sources.

Is=I(t)/Ns

Is=0.25amps/2sources

Is=.125amps

Voltage is the difference in electrical potential between two points.

Current is just the rate of flow of electric charge.

Each power source supplies .125amps of current to the load

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The net charge enclosed within the electric field is positive when more electric field lines leave a gaussian surface than enter it.

Remember, that a Gaussian surface is a three-dimensional closed surface that determines the flux of a vector field, often the gravity field, electric field, or magnetic field. A surface with more electric field lines departing than coming in indicates a net positive charge. It is important to note that E-field lines begin with positive charges and end with negative charges. This is characteristic of most gaussian surfaces. So, if more electric field lines exit than enter a gaussian surface, we may deduce that the enclosing net charge is generally positive.

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The magnitude of the magnetic field in the region through the current passes is 8×10⁻³  T.

The magnetic field is defined as the field the magnetic materials generate or when an electric charge moves in a field region that generates the magnetic field.

It is given that:

A conductor carrying a current I = 15.0 A is directed along the positive x-axis and perpendicular to a uniform magnetic field.

As we know,

F = ilB

i = 15 A
F/l = 0.120 N/m

B = (F/l)(1/i)

B = 0.120(1/15)

B = 8×10⁻³  T

Thus, the magnitude of the magnetic field in the region through the current passes is 8×10⁻³  T.

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Answer:

Element of a compound typically cannot be separated by physical means because atoms are chemically bonded together

Explanation:

Compounds are substances composed of two or more elements chemically combined that can be separated into simpler substances only by chemical means

Even if in a piece of writing, you happen to use the author's last name in my sentence, you also need to use it in the in-text citation.

In academic writing, it is often important to quote the sources that one used in writing up the text. Failure to give accurate citation could be taken as plagiarism by the assessors.

Hence, even if in a piece of writing, you happen to use the author's last name in my sentence, you also need to use it in the in-text citation.

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The height attained by the ball is 11.86m

a ball is shot from the ground straight up into the air its initial and final velocity is

initial velocity, u = 50 ft/s = 50×0.305  = 15.25m/s

final velocity ,v = 0 m/s

gravity =-9.8 m/s²

( negative sign shows acceleration in opposite direction)

height =?

using the newton motion of equation

v² = u² + 2as

where

a= acceleration due to gravity(g)

s = height

v² = u² + 2gs

(0)² = (15.25)² + 2×(-9.8)×s

0  = (15.25)² -  19.6 × s

s= - (15.25)²/ 19.6

s = 11.86m

after ignoring the air resistance the maximum height of the ball is 11.86m

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Answer:

1) Constants are variables that are kept the same throughout an experiment.

2) An independent variable is a variable that is manipulated by the experimenter.

3) A dependent variable is a variable that is measured by the experimenter.

Explanation:

The electric field for 20 cm is 8.09 MN/C

Length of the straight filament = (20cm) (1m/100cm) = 0.2

Electric field for the straight conductor = [tex]E = \frac{2k_{e} \lambda}{r}[/tex]

E = [2(8.99 × 10^9 N·m^2/C^2)(90.0 × 10^-6 C/m)] / 0.2 m

E = 8.09 MN/C

The electric field is directed radially inward, toward the filament.

The electric field is a force produced by a charge near its surroundings. This force is exerted on other charges when brought in the vicinity of this field. SI unit of the electric field is N/C (Force/Charge).

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The force produced by the train's engine will be 175000N.

Force is an external agent that has the power to alter an object's state of motion or rest. In a brief, force is a vector quantity that's also defined as a push or pull exerted on an object as a result of the object's contact with another object. The Newton (N) is the unit of force F.

F = ma

Here, F  is force, m is mass and a is acceleration of the object.

We are given here,

The force by the train weight = [tex]Fw[/tex] =  150,000N

The force creates by the friction = [tex]F_{f}[/tex] = 25,000N

Thus , to get the total force of the train's engine by adding force by weight and force by friction is given as,

[tex]F_{t} = F_{w}+ F_{f}[/tex]

Then for getting total force of the train's engine putting above values in the expression ,

[tex]F_{t} = 150,000 N +25,000N\\F_{t} = 175,000N[/tex]

Hence, the train’s engine has to produce 175000N force to become in equilibrium.

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The minimum spacing the engineer should leave between the sections to eliminate buckling is 0.011 m.

To calculate the minimum space the engineer must leave in other to eliminate bulking, we use the coefficient of linear expansivity of steel.

This can be defined as the increase in length, per unit length, per degree rise in temperature.

To calculate the minimum space, we use the fomula below

Formula:

Make L₂ the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the minimum spacing the engineer should leave between the sections to eliminate buckling is 0.011 m.

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The amount of heat required to warm the ice is 38.317 KJ

What is specific heat capacity ?

In scientific terms, a specific heat capacity is the quantity of heat (J) absorbed by a material every time its temperature goes up 1 K (or 1 °C), given in J/(kg K) or J/(kg °C) per unit mass. formulae for specific heat capacity is given by

Given data:

The mass of ice is, m = 40.0 g.

The initial temperature is, T = - 10 degree Celsius.

The final temperature is, T' = 110.0 degree Celsius.

The heat capacity of ice is, c = 2.09 J/g C.

The heat capacity of steam is, c' = 2.01 J/g C.

When ice absorbs heat, the conversion takes place from ice to water (liquid) and from the liquid to steam at 110 degree Celsius. So,

The amount of heat absorbed is given as,

Q = m[c(T' - T) + c'T']

Q = 40[2.09 x (110-(-10)) + 2.01 x (110+273))]

Q = 38,317.2 J

Convert in kJ as,

Q = 38,317.2/1000

Q = 38.317 kJ

Thus, we can conclude that the amount of heat required to warm the ice is  38.317 kJ.

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Answer:

true

Explanation:

The temperature in degrees Fahrenheit is 320 equal to twice the temperature in degrees Celsius.

The measurement of temperature as a physical quantity. In order to measure temperature, empirical scales take into account useful and trustworthy factors like the freezing and boiling temperatures of water.

The temperature will be solved as below:-

F = 2C

The temperature in degree centigrade is:-

C = ( 5 / 9 ) ( F - 32 )

Put the value in the equation above:-

F = 2 { 5 / 9 [ F -32 ]}

F = ( 10 / 9 ) [ F - 32 ]

( 9 / 10)F  = F - 32

( 9 / 10)F - F = 32

( -1 / 10)F = -32

F = 320°

Therefore, the temperature in degrees Fahrenheit is 320 equal to twice the temperature in degrees Celsius.

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Speed is a scalar quantity that describes "how fast an object is moving." The rate at which an object travels a distance can be thought of as its speed. The time taken by Fernando is 56 s.

Speed is only the rate at which motion changes. Or just the distance a body travels in a unit of time. Velocity is the rate at which an object's position changes and it takes direction into account. Speed has just magnitude because it is a scalar quantity.

The expression used to calculate speed is:

Speed = Distance / Time

Time = Distance / Speed

t = 1680 / 30

t = 56 s

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Answer:

Momentum of tennis ball = 0.048

Momentum of soccer ball = 6.88

momentum of soccer ball is greater than that of tennis ball.

Explanation:

For table tennis ball,

Momentum of tennis the ball is given by,

Momentum = mass × volume

Momentum =  0.003 × 16

Momentum = 0.048

For table soccer ball,

Momentum of the soccer ball is given by,

Momentum = mass × volume

Momentum =  0.43 × 16

Momentum = 6.88

Thus, momentum of soccer ball is greater than that of tennis ball.

The volume occupied by the gas at 3.1 atm pressure will be 11.12 L.

When a gas is maintained at a constant temperature and with a certain mass, Boyle's law states that the pressure of the gas is inversely proportional to its volume.

To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another. In 1662, the Anglo-Irish chemist Robert Boyle proposed the Boyle's law.

According to Boyle's law :

P1V1=P2V2 where,

P1 and P2 are the pressure and,

V1 and V2 are the volume of container.

As per the question, the given values are :

V1=15 L

P1= 2.3 atm and,

P2= 3.1 atm

So by using Boyle's theorem :

2.3 atm× 15 L = 3.1 atm× V2

34.5=3.1 atm × V2

V2=11.12 L

Hence, the volume at 3.1 atm pressure will be 11.12 L.

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