If the mass of the bar is 50kg, and Shelbi exerts 550N of force, what is the acceleration of the bar?

The given problem can be solved using the concept of electromagnetic induction. The emf induced between the two sides of the car is equal to the rate of change of magnetic flux linked with the car: the emf induced between the two sides of the car is -0.02 l Tm²/s².

The formula to calculate emf is:  emf = -dΦ/dt

where Φ is the magnetic flux. The negative sign indicates the Lenz's law. The width of the car is given as 2.0 m.

The magnetic field and the velocity of the car is given as 3.1 x 10-5 T and 20 m/s respectively.

The magnetic flux through the car is given as: Φ = BAl

where A is the area of the car and l is the length of the car.

Since the magnetic field is perpendicular to the car's velocity, the magnetic flux through the car is equal to the product of the area of the car and the magnetic field.

Therefore,Φ = BAl= 3.1 x 10-5 T x 2.0 m x l= 6.2 x 10-5 l T.m²/s

The emf induced between the two sides of the car is equal to the rate of change of magnetic flux linked with the car. Since the car is traveling in a straight line, the length of the car remains constant.

Therefore, dΦ/dt = Bl dv/dt

where v is the velocity of the car along the direction perpendicular to the magnetic field.

Therefore, emf = -dΦ/dt=  -Bl dv/dt= -0.02 l Tm²/s²

The emf induced is negative because the direction of the emf is opposite to the direction of the motion of the car. Therefore, the emf induced between the two sides of the car is -0.02 l Tm²/s².

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An airplane flies 170km in 15 min  in the given case.

To find the average speed, we divide the total distance by the time taken:

Average. speed = Total distance / Time taken

In this case, the total distance is 170 km and the time taken is 15 min. However, it's more common to express speed in km/hr, so we need to convert 15 min to hours:

15 min = 15/60 = 0.25 hours

Now we can calculate the average speed:

Avg. speed = 170 km / 0.25 hours = 680 km/hr

Therefore, the average speed of the airplane is 680 km/hr.

Q1b. Sarah rides her horse with a constant speed of 20 km/hr. How far can she travel in 4 hours?

To find the distance Sarah can travel in 4 hours, we multiply her speed by the time:

Distance = Speed x Time

In this case, Sarah's speed is 20 km/hr and the time is 4 hours, so:

Distance = 20 km/hr x 4 hours = 80 km

Therefore, Sarah can travel 80 km in 4 hours on her horse.

Q2a. An airplane flies at a constant speed of 780 miles per hour. How long will it take to travel a distance of 2635 miles?

To find the time it takes the airplane to travel a distance of 2635 miles, we divide the distance by the speed:

Time = Distance / Speed

In this case, the distance is 2635 miles and the speed is 780 miles per hour, so:

Time = 2635 miles / 780 miles per hour ≈ 3.38 hours

Therefore, it will take the airplane approximately 3.38 hours to travel a distance of 2635 miles at a constant speed of 780 miles per hour.

Q2b. An airplane flies at a constant speed of 540 miles per hour. How long will it take to travel a distance of 2160 miles?

To find the time it takes the airplane to travel a distance of 2160 miles, we divide the distance by the speed:

Time = Distance / Speed

In this case, the distance is 2160 miles and the speed is 540 miles per hour, so:

Time = 2160 miles / 540 miles per hour = 4 hours

Therefore, it will take the airplane 4 hours to travel a distance of 2160 miles at a constant speed of 540 miles per hour.

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Answer:

false

Explanation:

cause bacteria prefers moist and damp environment

Answer:

False

Explanation: bacteria thrive on moister and grow due to it. if the enviroment they were in were to be dry, the bacteria itself would die. Hope this helps! :)

A. The free-body diagram for the book would show the force of gravity, or weight, pulling the book downwards and the force of the student's hand pushing the book upwards. As the book rises at steady speed, the force exerted by the student on the book is equal to the force of gravity, or mg, because the book is not accelerating.

B. 1. The book lifted at constant speed gains potential energy because its height above the ground is increasing. It does not gain kinetic energy because its speed does not change.
2. The potential energy gained by the book is equal to the work done on it, which is 25 joules.
C. 1. The work done by the student is W = Fd = mgd, where d is the distance the book is lifted. Since the book is lifted through a height h, we have d = h, so the work done is W = mgh.
2. The potential energy gained by the book is also equal to mgh, since the work done on the book is converted into potential energy.
D. Parts B and C provide a conceptual and mathematical understanding of how work, potential energy, and the force of gravity are related in the process of lifting an object. They demonstrate that the work done on an object is converted into potential energy, which is directly proportional to the object's mass, the acceleration due to gravity, and the height it is lifted. The equation U = mgh is a simplified version of the relationship between work and potential energy, but understanding the derivation of this equation through the formal definition of work provides a deeper understanding of the underlying physics.

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The scale will read 147N

The mass of the object, m = 15 kg

Since I am on the earth, the acceleration due to gravity on the earth is:

g = 9.8 m/s²

The scale will read the weight of the object, and is calculated below

The weight, W = mg

W = 15(9.8)

W = 147 N

Therefore, the scale will read 147N

Answer: The answer is F

Explanation: because it is I took the test

Answer:

Concentrate buildings

Hope it helped u if yes mark me BRAINLIEST!

Tysm!

Answer:

The unit of measurement of work is Nm which is also called as Joule and written J.

work done by the body builder against gravity = 3920J

Explanation:

work = force x displacement

force on barrel = 200 x gravity = 200 x 9.8 = 1960 N

displacement = 2m

work done against gravity = 1960 x 2 = 3920 J

Due to surface tension, it is possible to support an object heavier than the weight of water.

Surface tension is an attractive force exerted by the molecules present in the liquid. It results from the tendency of the liquid to minimize its surface area by creating a thin, elastic layer at its surface. Due to this property of liquids, objects with a weight heavier than that of water can be supported on the surface of the liquid. In addition, surface tension also allows some insects like water striders to walk on water without sinking. The water striders have special long legs that distribute their weight evenly over the water surface.

Surface tension plays an important role in nature, and it is possible to support objects heavier than the weight of water because of it. It is an essential property of liquids that enables various natural phenomena to occur.

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Answer: A BaBr2

Explanation:

On the left side of the equation, the superscript 2 is applied to both sodium AND bromine. That means you need 2 bromine on the right. Also on the left side, the 2 AFTER chlorine only applies to the chlorine so there’s only one barium. What you have on the left has to balance with what you have on the right.

Answer:

HOPEFULLY i am correct but i say its D. Hopefully I helped!✨

Answer: It can be A or B

Explanation: In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.

When the person is moving downward and the acceleration is zero, the force exerted by the bungee cord equals the force of gravity acting on the person.

This can be expressed as k(l-l0) = mg, where g is the acceleration due to gravity. Solving for the total length of the bungee cord, we get l = (mg/k) + l0. This means that the total length of the bungee cord at the point where the person's acceleration is zero is equal to the sum of the natural length of the bungee cord and the distance the person has fallen due to gravity, which is given by (mg/k). Therefore, the correct expression for the total length of the bungee cord is l = (mg/k) + l0.
In this bungee jumping scenario, a person of mass m experiences zero acceleration at a certain point during the downward motion. Given the natural length of the bungee cord as l0 and its spring constant as k, we can determine the total length (l) of the stretched bungee cord. At zero acceleration, the downward force of gravity (mg) is equal to the upward force exerted by the stretched cord (kΔl), where Δl is the stretched length (l - l0). Thus, we have mg = k(l - l0). To find the total length l, rearrange the equation: l = (mg/k) + l0.

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The average velocity will be 1.30 x 10⁻² m/ s.

Velocity is defined as the ratio of the distance moved by the object at a particular time. As a vector quantity, the velocity requires both the magnitude and the direction.

Given that a helicopter blade spins at exactly 80 revolutions per minute. Its tip is 4.00 meters from the rotational axis.

Use the formula to calculate the linear velocity.

V= d/t

V= velocity

d= distance

t= time

Here d will be the circumference of the blade

d= 2πr

We have:-

80 rev = 1min

1min/ 80= 60s/80

The average velocity will be calculated as below:-

Vavg= 2π( 10m ) / 80 x 60

Vavg= 0.01308 m / s

Vavg = 1.30 x 10⁻² m / s

Therefore, the average velocity will be 1.30 x 10⁻² m/ s.

The complete question is given below:-

A helicopter blade spins at exactly 80 revolutions per minute. its tip is 4.00 m from the center of rotation. What will be the average speed of the helicopter blade?

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Answer:

At t = 0   S = 0

S = 3 * 3^3 - 20 * 3^2 + 40 * 3    after 3 sec

S = 3 * 27 - 20 * 9 + 120 = 21 after 3 sec

v = ds/dt = 9 * t^2 - 40 * t + 40 = 9 * 9 - 40 * 3  + 40 = 1

ds/dt = 9 t^2 - 40 t + 40      v at any time

If zero = 9 t^2 - 40 t + 40  then you need to solve the quadratic for t

a = ds^2 / dt^2 = dv /dt = 18 t - 40    for the acceleration at any time

At t = zero (the initial acceleration) a = -40

The question is asking whether it is possible to find a magnetic vector potential for a given uniform surface current flowing in the xy plane and generating a magnetic field for different regions of space.

To determine whether it is possible to find a magnetic vector potential for the given scenario, we need to consider the conditions that must be satisfied. In general, a magnetic vector potential A can be found if the magnetic field B satisfies the condition ∇ × A = B. This is known as the magnetic vector potential equation.

In the given situation, the magnetic field is different for the regions above and below the xy plane. For z > 0, the magnetic field is described as B = MoK -î, and for z < 0, it is described as B = -MoK -î. To find the magnetic vector potential, we need to determine if there exists a vector potential A that satisfies the equation ∇ × A = B in each region.

By calculating the curl of A, we can check if it matches the given magnetic field expressions. If the curl of A matches the magnetic field expressions for both regions, then it is possible to find a magnetic vector potential for the given scenario. However, if the curl of A does not match the magnetic field expressions, then it is not possible to find a magnetic vector potential that satisfies the conditions.

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Part 1: The number of pathways in a circuit determines the possible routes for electric current to flow.

There are maximum of five pathways in this circuit, depending on its complexity and the arrangement of components.

Part 2: Determining whether the circuit is series or parallel requires more information.

In a series circuit, components are connected in a single path, and the current flows through each component sequentially.

If the circuit has only one pathway (zero or one pathway), it suggests a series circuit.

However, if the circuit has multiple pathways (two or more pathways), it indicates a parallel circuit.

To conclusively determine the circuit's nature, we need to analyze the circuit diagram or obtain additional details regarding the component connections and their interactions.

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Answer:

The correct answer is B.

The astronaut will know due to the light from the explosion.

Explanation:

Sound and vibrations require a medium such as air to travel through. Space, there is no air. Only a vacuum. So sound and vibrations are unable to travel. Light requires no medium to travel. It can go through a vacuum.  

Therefore the Astronaut will see a bright flash of light as it travels from the explosion to outer space. It is also important to note that light can travel very far because nothing else interacts with its wave particles and as such, it cannot be impeded.

Cheers!

Answer:

\(15\:\mathrm{J}\)

Explanation:

The potential energy of an object is given by \(PE=mgh\).

Recall that the weight of an object is equal to the force of gravity on the object. From this, we can set up the following equation and solve for the mass of the object:

\(F=mg,\\5=mg,\\m=\frac{5}{9.81}\approx 0.51\:\mathrm{kg}\)

Now we can plug in values to \(PE=mgh\) and solve:

\(PE=0.51\cdot9.81\cdot3=\fbox{$15\:\mathrm{J}$}\).

Answer:

The potential energy of the body is 15J.

Explanation:

The energy possessed to a body due to position is called Potential energy.

U=mgh

U=mgh

U=5×3=15J

Hence, the potential energy of the body is 15J.

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It would be a parallel circuit.

The process produces heat.Hydrochloric acid generates bubbles when a strip containing zinc metal is introduced to the test tube, and the tube gets warm.The hydrogen gas forms, which causes the bubbles.The reaction then produces heat.

Hydrogen gas and zinc chloride are produced quickly by the reaction of zinc with hydrochloric acid.In a single displacement reaction, zinc metal displaces hydrogen to produce zinc chloride and hydrogen gas.Zn (s)+2HCl(aq) ZnCl2(aq)+H2 is an exothermic process that produces a lot of heat (g).

Reason: Zn+2HCl ZnCl2 + H2 is the result of the interaction involving zinc and hydrochloric acid.Single replacement reaction is the name given to this process in which zinc metal replaces hydrogen to produce salts of zinc chloride and hydrogen gas.

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Answer:

When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them

It's important to consider other factors such as body composition, physical activity levels, and overall health when making dietary recommendations.

According to Louna's age and body weight, her protein needs can be estimated using the Recommended Dietary Allowance (RDA) for protein intake. The RDA for protein intake for children aged 9-13 years is 0.95 grams of protein per kilogram of body weight per day. Using this formula, we can calculate Louna's daily protein needs as follows:

Protein Needs = 0.95 g/kg body weight x 32 kg body weight
Protein Needs = 30.4 grams of protein per day

It's important to note that Louna's protein needs may vary depending on her level of physical activity, health status, and growth rate. Additionally, it's recommended that children consume a variety of protein sources, including lean meats, poultry, fish, eggs, dairy, beans, nuts, and seeds, to ensure they are getting all the essential amino acids needed for growth and development.

It's also worth mentioning that while BMI is a useful tool for assessing body weight and health status, it is not a perfect indicator of health.

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Given data

*The given initial velocity is u = 0 m/s

*The given acceleration is a = 7 m/s^2

*The given final velocity is v = 25 m/s

The formula for the time taken to reach his final velocity is given by the kinematic equation of motion as

Substitute the known values in the above expression as

Thus, the time taken to reach his final velocity is t = 3.57 s

To raise the automobile with a hydraulic lift, a force of approximately 19,000 N must be applied to the piston.

In a hydraulic lift, the principle of Pascal's law is applied, which states that pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and the walls of its container. By utilizing this principle, a smaller force applied to a smaller piston can generate a larger force on a larger piston.

In this scenario, the force needed to lift the automobile can be calculated using the formula:

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

where \(F_{1}\) is the force applied to the piston, \(A_{1}\) is the area of the piston, \(F_{2}\) is the force generated on the larger piston (required to lift the automobile), and \(A_{2}\) is the area of the larger piston.

Given the radius of the shaft (small piston) as 0.08 m and the radius of the piston as 0.01 m, we can calculate the forces applied and generated as follows:

\(A_{1} = \pi (0.08)^2\\A_{2}= \pi (0.01)^2\)

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

Simplifying the equation and substituting the values, we can solve for \(F_{2}\):

\(F_{2}=\frac{F_{1}A_{2}}{A_{1}}\)

Plugging in the values, we find:

\(F_{2}=\frac{F_{1} \pi (0.01)^2 }{ \pi (0.08)^2} \\F_{2}= \frac{F_{1}\times 0.0001}{0.0064} \\F_{2}= 0.015625 \times F_{1}\)

Given that the mass of the automobile is 1520 kg and the acceleration due to gravity is \(9.8 \hspace m/s^{2}\), we can equate \(F_{2}\) to the weight of the automobile:

\(F_{2}= mg\\0.015625\times F_{1}= 1520\times 9.8\)

Solving for \(F_{1}\), we find:

\(F_{1}\approx \frac{1520\times 9.8}{0.015624} \\F_{1} \approx 19072 \hspace N\)

Therefore, a force of approximately 19,000 N must be applied to the piston in order to raise the automobile using the hydraulic lift.

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Answer:

Day when I workout I feel I have more energy, but on days when I don't I feel sluggish and tired

The car stopping short is the unbalanced force.

A force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N). Force is represented by the symbol F.

When the resultant force acting on a body is not equal to zero, the forces acting on the body are known as unbalanced forces. The body acted upon by unbalanced forces changes its state of motion.

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Answer:

There is not such thing as SI unit of meter

Meter is SI unit for length