HIIIIII I NEED HELPPPPPP
You may choose to answer them all, but if you'd like, just answer a few of them :)

1. The unit of electric potential or electromotive force is the _____.
volt
ohm
ampere
franklin

2. In a circuit, a battery is used to _____.
conduct current
slow down current
raise the potential of electrons
convert electrical energy to some other form of energy

3. Why is current supplied to consumers from generating plants in the form of alternating current?

Direct current cannot be generated in the amount necessary to supply enough consumers.
It is a much more efficient mode of transmitting electricity than direct current.
This is the only form that current can be transmitted over the long distances.
It is way too dangerous to transmit direct current to consumers' homes.

4. When you turn on a television, the electrical circuit _____.
closes
opens
does not move

The electric field in the copper wire is approximately 7.63 x \(10^{-5}\) V/m. The drift velocity of free electrons in a copper wire is given as 8.32 x \(10^{-4}\) m/s.

The electric field in a conductor is directly proportional to the drift velocity. The relationship between drift velocity and electric field is given by:

vd = (eEτ)/(m)

where,

vd = drift velocity of electrons

e = charge of an electron

E = electric field

τ = relaxation time of electrons

m = mass of an electron

Assuming the values of e, m, and τ for copper, we can solve for the electric field:

E = (vd x m)/(eτ)

E = (8.32 x \(10^{-4}\) m/s x 9.11 x \(10^{-31}\) kg)/(1.6 x \(10^{-19}\) C x 2.3 x \(10^{-14}\) s)

E ≈ 7.63 x \(10^{-5}\) V/m

Therefore, the electric field in the copper wire is approximately 7.63 x \(10^{-5}\) V/m.

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The wavelength of the earthquake that shook you with a frequency of 10 Hz and reached a city 84 km away in 12 s is approximately 500 meters.

To determine the wavelength of an earthquake that shakes you with a frequency of 10 Hz and reaches a city 84 km away in 12 s, we can use the equation:

wavelength = speed / frequency

The speed of an earthquake wave depends on the medium it travels through. In this case, we will assume that the wave is traveling through the Earth's crust, where the average speed of seismic waves is about 5 km/s.

First, we need to calculate the time it took for the earthquake wave to travel 84 km:

distance = speed x time

84 km = 5 km/s x time

time = 16.8 s

Now we can use the formula to find the wavelength:

wavelength = speed / frequency

wavelength = 5 km/s / 10 Hz

wavelength = 0.5 km or 500 m

Therefore, the wavelength of the earthquake that shook you with a frequency of 10 Hz and reached a city 84 km away in 12 s is approximately 500 meters.

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In a simple electrical circuit, if it contains a battery, a light bulb, and a properly connected ammeter, the ammeter has a very low internal resistance because it is connected in series with the circuit.

An electrical circuit is made up of a combination of resistors, voltage sources, and current sources that are interconnected in a closed loop. It is used to generate an electric current in a complete circuit and can be as straightforward as a battery connected to a bulb or as complicated as a full-scale electronic circuit.

Ammeters are measuring devices that are used to measure current in a circuit. The ammeter should be connected in series with the circuit to allow current to flow through it. An ammeter with a very low internal resistance should be used since any extra resistance in the ammeter can change the current being measured.

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Answer:

Is always towards the center of the Earth

Explanation:

As a satellite moves around the Earth in a circular orbit, the direction of the force of gravity is always towards the center of the Earth. At an altitude of 100 km, you would be so high that you would see black sky and stars if you looked upwards.

The four methods of acquiring knowledge are observation, experience, reasoning, and education.

Observation involves gathering information through the senses and paying attention to what is happening in the environment. Experience involves learning through personal encounters, such as practical work or life events. Reasoning involves using logic and critical thinking to draw conclusions and make decisions.

Education involves acquiring knowledge through formal instruction and learning, such as in a school setting or through reading and studying. All four methods are important and can be used in combination to acquire a deep and well-rounded understanding of a subject.

Observation and experience provide hands-on and practical knowledge, while reasoning and education provide theoretical and abstract knowledge. By using a combination of these methods, individuals can broaden their understanding and knowledge of the world around them.

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Weight is defined as the force on an object that results from acceleration or gravity.

It can be calculated as:

W=mg

W= weight of an object (Newtons)

m = mass of the object (kilograms)

g = gravity (m/s^2)

given the information we can rearrange for m:

\(m=\frac{3920N}{9.8m/s^2}\)

\(m=400 kg\)

Answer:

The velocity of the rock is 47.24 m/s

The displacement of the rock is 110.48 m

Explanation:

The initial velocity u = 8.0 m/s

time t = 4.0 s

Using

\(v = u + gt\)

where v is the final velocity of the rock after 4.0 s

u is the initial speed = 8 m/s

g is acceleration due to gravity = 9.81 m/s

t is the time = 4.0 s

substituting, we have

\(v = 8 + (9.81*4)\)

\(v = 8 + 39.24\) = 47.24 m/s

Also, using

\(s = ut + \frac{1}{2} gt^{2}\)

where

s is the distance that the stone fell

t is the time = 4.0 s

g is the acceleration due to gravity = 9.81 m/s^2

substituting values, we have

\(s = (8 * 4) + (\frac{1}{2}*9.81*4^{2})\)

s = 32 + 78.48

s = 110.48 m

Given:

By using the relation, we get

→ \(v = u+gt\)

By substituting the values, we get

     \(= 8+(9.8\times 4)\)

     \(= 8+39.24\)

     \(= 47.24 \ m/s\)

hence,

→ \(s = ut+\frac{1}{2} gt^2\)

     \(= (8\times 4)+(\frac{1}{2}\times 9.81\times 4^2 )\)

     \(= 32+78.48\)

     \(= 110.48 \ m\)

Thus the above answer is appropriate.    

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The equations that can be used to solve for the force of friction exerted on the block by the surface is F- f = mv² / d

The constant force F is exerted on the block of mass and it accelerates with a speed, v and covering a distance of d in the direction of the force. The force of friction is an opposing force to the applied force.

Therefore,

using Newtons third law

F - f = ma

a = v/t

t = d/v

F - f = m × v / t

F- f = m × \(\frac{v}{\frac{d}{v} }\)

F- f = m × v²/d

Therefore,

F- f = mv² / d

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50 μm = 5 × 10⁻⁵ m  in diameter

1μm = 1 x \(10^{-6}\)m

1μm = 1 x \(10^{-6}\)m

50μm = 50 x \(10^{-6}\)m

50μm =  50 x 10 x \(10^{-6}\)

50μm = 5 x \(10^{-5}\)m

A human hair is approximately 50 μm = 5 × 10⁻⁵ m  in diameter

between 17 and 181 micrometers

The typical diameter of human hair can range from 17 micrometers to 181 micrometers, according to research. Using 50 micrometers as an average figure for its diameter, this translates to 50,000 nanometers.

The finest hair is flaxen, with a diameter ranging from 1/1500 to 1/500 of an inch. the coarsest hair is black, measuring between 1/450 and 1/140 of an inch.

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Answer:

kinetic energy by 50 percent

The other responses are all essentially correct, but I'd want to offer a somewhat different perspective. This one is a little more technical, but it offers an intriguing perspective, in my opinion.

One of the first things I would mention is the fact that orbits are ellipses rather than circles. The phrases apogee and perigee are used because of this. The apogee is the orbit's highest point, while the perigee is its lowest point, giving the shape of an ellipse. A circular orbit is just an ellipse with the same apogee and perigee. However, apogee and perigee are not the crucial variables from an orbital perspective; rather, apoapsis and periapsis are.

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Answer:

the length of 1,2,3,4,5,6 is add and minus

ok

The weight of a 75 kg person on Earth is 735 N, The correct option is D.

Acceleration due to gravity is the acceleration that an object experiences due to the gravitational force exerted by a massive body, such as Earth. The acceleration due to gravity on Earth is approximately 9.8 meters per second squared (m/s^2) and is denoted by the symbol "g".

The acceleration due to gravity is a vector quantity, which means that it has both magnitude and direction. The direction of the acceleration due to gravity is always downwards, towards the center of the massive body.

The acceleration due to gravity is a constant value near the surface of the Earth, but it can vary slightly depending on altitude, latitude, and the composition of the Earth's interior. For example, at higher altitudes, the acceleration due to gravity decreases slightly, while at the equator, it is slightly greater than at the poles due to Earth's rotation.

The acceleration due to gravity plays an important role in many physical phenomena, including free fall, projectile motion, and the behavior of fluids in containers.

Here in the Question,

The weight of a 75 kg person on Earth can be calculated using the formula:

weight = mass x acceleration due to gravity

Substituting the given values, we get:

weight = 75 kg x 9.8 m/s^2

weight = 735 N

Therefore, the weight of a 75 kg person on Earth is 735 N, which is option D.

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Starting from rest on a circular track with a radius of 300 m and a constant tangential acceleration of 0.75 m/s², the car will travel a distance of approximately 0.2119 meters or 21.19 centimeters in 0.75 seconds.

To determine the distance traveled and the time elapsed by the car starting from rest on a circular track with a radius of 300 m and a constant tangential acceleration of 0.75 m/s², we can use the equations of circular motion.

The tangential acceleration is the rate of change of tangential velocity. Since the car starts from rest, its initial tangential velocity is zero (v₀ = 0).

Using the equation:

v = v₀ + at

where v is the final tangential velocity, v₀ is the initial tangential velocity, a is the tangential acceleration, and t is the time, we can solve for v:

v = 0 + (0.75 m/s²) * t

v = 0.75t m/s

The tangential velocity is related to the angular velocity (ω) and the radius (r) of the circular track:

v = ωr

Substituting the values:

0.75t = ω * 300

Since the car starts from rest, the initial angular velocity (ω₀) is zero. So, we have:

ω = ω₀ + αt

ω = 0 + (0.75 m/s²) * t

ω = 0.75t rad/s

We can now substitute the value of ω into the equation:

0.75t = (0.75t) * 300

Simplifying the equation gives:

0.75t = 225t

t = 0.75 seconds

The time elapsed is 0.75 seconds.

To calculate the distance traveled (s), we can use the equation:

s = v₀t + (1/2)at²

Since the initial velocity (v₀) is zero, the equation becomes:

s = (1/2)at²

s = (1/2)(0.75 m/s²)(0.75 s)²

s = (1/2)(0.75 m/s²)(0.5625 s²)

s = 0.2119 meters or approximately 21.19 centimeters

Therefore, the car travels a distance of approximately 0.2119 meters or 21.19 centimeters.

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We need to find whether the two children applying a force can close a box when its lid is being pushed up by a spring.

The children cannot close the box as the force the children applying is less than the force the spring is applying.

The force that one child is providing is 25 N and the other child is 30 N. The force is being applied downward.

The spring on the lid is applying a force of 60 N upwards.

In order to close the lid a force more than 60 N is required downward.

The total force applied to the lid is 55 N which less than the force the lid is applying so the children will not be able to close the lid.

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Answer:

the motion of the sled decrease

Explanation:

the mass increase

The acceleration of the sled will is inversely proportional to the mass on it. Therefore, the motion of the sled would slow if Joslyn's friend Lisa also wanted to ride.

Acceleration in mechanics can be described as the rate of change of velocity of an object with respect to time. The acceleration of an object is a vector quantities with magnitude and direction.

The S.I. unit for acceleration can be represented as m/s² the net balance of all external forces acting is equal to the magnitude of the net resulting force.

The force (F) acting on an object is equal to the product of the mass (m) of the object and acceleration (a) of an object.

F = ma

And, a = F/m

As shown in the above equation, the mass of the object is inversely proportional to the acceleration of the object, therefore, the acceleration of the sled decrease as the mass on it increases.

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Answer:

SQUID game imagine

Explanation:

Answer: Rob's father does love him unconditionally but he also just wants rob to have a successful future and be able to have money for his own car and other necessities needed for when he is on his own.

Explanation:

The speed of the car is 10.10 meters per second.

The rate at which an object's position changes in any direction is referred to as speed.

The distance travelled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.

The speed of the car = total distance travelled/ time interval

= 200 km/5.5 hour

= 200 × 1000 meter/ 5.5 × 3600 second

= 10.10 meter/second

Hence, the speed of the car is 10.10 meters per second.

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Answer:

A. New problem or discovery Engineering solution Development Research Explanation:

A possible  sequence of steps in the research and development cycle are  A. New problem or discovery Engineering solution Development Research​. In the  research and development cycle, the first step is the problem that a scientist observe. After that we have discover a solution for that problem through many research so the above materials are the possible sequence of steps in the research and development cycle.

Answer:

i got 6

Explanation:lmk if i’m wrong

Answer: i think 1.666...

17.01 m/s is the car’s velocity .

s=ut+at²/2

s-at²/2=ut

u=s-at²/2÷t

u=312/18.4

u=17.01 m/s

"The rate at which an item changes its location" is described by a vector number called velocity. Imagine someone walking swiftly, one step forward, one step back, and starting each step from the same location. Velocity is a vector quantity. Therefore, velocity is cognizant of direction. The direction must be taken into account when determining an object's velocity. A velocity of 55 miles per hour is not adequate information. It is necessary to account for the direction in order to accurately describe the object's velocity. Simply put, the direction of the velocity vector represents the motion of the object.

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The new period of oscillation if the mass of the bob is reduced by half is \(\frac{T}{\sqrt{2}}\) or T/√2.

Look at the attachment for a complete question. The period of oscillation of the simple pendulum

where

If we change the mass of the bob and didn't change the rope, the period also will change but the rope constant will not. The ratio of the period between the two condition

T² = 4π²m/k

T₁²: T₂² = m₁ : m₂

T²: T₂² = m : 0.50 m

T²: T₂² = 1 : 0.5

T₂² = 0.5T²

\(T_2 \:=\: \sqrt{0.5T}\)

\(T_2 \:=\: \sqrt{\frac{T}{2}}\)

T₂ = T/√2

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The set of transformations that would linearize these data on a scatterplot using a power model including the following:

a) ln(Length), ln(Time).

c) log(Length), log(Time).

e) Length, Time².

A transformation can be defined as the movement of a point from its original (initial) position to a final (new) location. This ultimately implies that, when an object is transformed, all of its points would be transformed as well.

In Mathematics, linearizing an equation is a process that involves modifying an equation in order to produce new variables which can be plotted on a graph (scatterplot), so as to create a straight line graph.

In conclusion, finding the natural log of both time and length, the logarithm of both time and length, and length and the square of time (Time²) are set of transformations that would linearize the given data on a scatterplot by using a power model.

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Using the concepts of angular velocity, we got that    0.025sec is the period of one revolution for a grinding wheel which is rotating with an angular velocity of 251 radians per second.

We know that angular velocity is defined as the change of angular displacement with respect to time.

or ,ω=θ/t

Here, grinding wheel is circular in shape means total angular displacement is 360 degree or 2\(\pi\)

So according to the formula,

=>251=2π/t

=>t=2π/251

=>t=(2×3.14)/251

=>t=6.28/251

=>t=0.025sec

Hence, if a grinding wheel is rotating with an angular velocity of 251 radians per second, the period of one revolution is 0.025sec.

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When the puck has descended to a height of R/2, it no longer makes touch with the sphere.

To solve this problem, we can use the conservation of mechanical energy. Initially, the mass is at rest and has only potential energy, which is given by mgh, where m is the mass of the puck, g is the acceleration due to gravity, and h is the height of the puck above the ground. When the puck slides down the sphere, it loses potential energy and gains kinetic energy, which is given by \((\frac{1}{2}mv^2)\), where v is the velocity of the puck. However, as the puck slides down the sphere, it also experiences a normal force from the sphere, which reduces the force of gravity and affects the speed of the puck.

Let's start by finding the normal force on the puck. At the top of the sphere, the normal force is equal to the weight of the puck, which is mg. As the puck slides down the sphere, the normal force decreases until it reaches zero when the puck loses contact with the sphere. At this point, the gravitational force is equal to the centrifugal force, which is mv^2/R, where R is the radius of the sphere.

Setting these forces equal, we get:

\(mg = \frac{mv^2}{R}\)

Simplifying, we get:

\(v^2 = gR\)

Now we can use conservation of mechanical energy to find the height at which the puck loses contact with the sphere. At this point, all the potential energy has been converted into kinetic energy, so we have:

\(mgh = (\frac{1}{2})mv^2\)

Substituting \(v^2 = gR\), we get:

\(h = R(1 - \frac{1}{2}) = \frac{R}{2}\)

Therefore, the puck loses contact with the sphere when it has fallen to a height of R/2.

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The centripetal acceleration of the car driving at a constant speed of 21 m/s around a circle with a radius of 100 m is calculated to be 4.41\(m/s^2.\)

To find the centripetal acceleration of the car, we can use the formula:

a = \(v^2\) / r

where "a" represents the centripetal acceleration, "v" is the velocity of the car, and "r" is the radius of the circular path.

Given that the car drives at a constant speed of 21 m/s and the radius of the circle is 100 m, we can substitute these values into the formula to calculate the centripetal acceleration.

a = (21\(m/s)^2\)/ 100 m

a = 441 \(m^2/s^2\)/ 100 m

a = 4.41 \(m/s^2\)

Therefore, the centripetal acceleration of the car is 4.41\(m/s^2.\) This centripetal acceleration represents the inward acceleration that keeps the car moving in a circular path, and its magnitude is determined by the square of the velocity divided by the radius of the circle.

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A capacitor is a passive electronic component that is used to store electrical energy. It is constructed by separating two metal conductors, known as plates, with an insulating material, known as a dielectric.

The dielectric can be made of a variety of materials, such as air, paper, ceramic, plastic, or even a vacuum. The two plates of a capacitor are electrically charged with opposite charges, creating an electric field between them. The amount of charge that can be stored in a capacitor depends on several factors, including the size of the plates, the distance between them, and the properties of the dielectric material. Capacitors are used in a wide range of electronic devices and circuits, such as filters, timing circuits, and power supplies. They can also be used to store energy in electric vehicles and renewable energy systems.

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