The attracting and repelling forces of magnets are used in countless objects, from refrigerator doors to maglev trains.
Refrigerator doors use the attraction of magnets to stay closed, while maglev trains use magnetic repulsion to hover
above rails. The center magnet in the picture is hovering between two magnets, making it appear to float. Which best
explains how the center magnet is able to hover between two other magnets?

Answer:

F = 12 N

Explanation:

Mechanical Work

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being F the force vector and s the displacement vector, the work is calculated as:

W = F.s

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

When the value of the work is known and we need to find the force, we solve the above equation for F:

[tex]\displaystyle F=\frac{W}{s}[/tex]

The wrapping present is moved by s=9 m doing W=108 J of work. The force used is:

[tex]\displaystyle F=\frac{108}{9}[/tex]

F = 12 N

Answer:

true

Explanation:

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.

Answer:

A. 3.4 m

Explanation:

Given the following data;

Force = 56.7N

Workdone = 195J

To find the distance

Workdone is given by the formula;

[tex] Workdone = force * distance[/tex]

Making "distance" the subject of formula, we have;

[tex] Distance = \frac {workdone}{force} [/tex]

Substituting into the equation, we have;

[tex] Distance = \frac {195}{56.7} [/tex]

Distance = 3.4 meters.

Answer:

Take the measurement of the distance (d) with a meter rule (in meters) and also measure the time (t) of the travel in seconds with a stopwatch.

question: What is the speed of the cart?

Explanation:

The speed of an object in motion is the distance covered by the object with respect to time, that is, the ratio of distance covered to the time taken to reach that distance.

Speed = distance / time

           = d (in meters m) / t (in seconds s) = m/s

Answer:

takes 365 days and it bring us seasons such as, spring,winter and fall.

Answer:

These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

Answer: action, opposite

Explanation:

Answer:

Friction does not oppose motion, it oppose relative motion.

Explanation:

static friction opposes relative motion

Answer:

there are three types or friction

1) Static friction

2) Rolling Friction

3) Sliding friction

Static friction comes to end when the object starts moving(or starts motion ) so Sliding Friction and Rolling Friction opposes motion l.

Answer:  Answer is A.

A magnetic field around the wire

Explanation:

Answer:

the aluminum would have the most mass

Answer:

9.6m/s

Explanation:

Using the equation S=d/t where s=speed, d=distance, and t=time

plug in the known variables

S=120m/12.5s

S=9.6m/s

Answer:

The answer is 600 using metric system

Answer:

600 cm

Explanation:

60,000 ÷100=600

Explanation:

towards the normal

MARK ME BRAINLIST

Answer:

a wedge.

Explanation:

it moves when you apply force to one end of the wedge.

Answer:

The coefficient of friction causes the force on the object to be less than its initial reading on the spring scale.

Explanation:

Since the block reads 24.5 N before the block starts to move, this is its weight. Now, when the block starts to move at a constant velocity, it experiences a frictional force which is equal to the force with which the student pulls.

Now, since the velocity is constant so, there is no acceleration and thus, the net force is zero.

Let F = force applied and f = frictional force = μN = μW where μ = coefficient of friction and N = normal force. The normal force also equals the weight of the object W.

Now, since F - f = ma and a = 0 where a = acceleration and m = mass of block,

F - f = m(0) = 0

F - f = 0

F = f

Since the force applied equals the frictional force, we have that

F =  μW and F = 23.7 N and W = 24.5 N

So, 23.7 N = μ(24.5 N)

μ = 23.7 N/24.5 N

μ = 0.97

Since μ = 0.97 < 1, the coefficient of friction causes the force on the object to be less than its initial reading on the spring scale.

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 300 × 10

We have the final answer as

Hope this helps you

Answer:

Magnetic north is the direction towards the north magnetic pole, which is a wandering point where the Earth's magnetic field goes vertically down into the planet

Explanation:

I searched it up lol

Answer:

I'm pretty sure the answer is around 9.2 seconds

Explanation:

Answer:

... As has been previously discussed, heat is not something that is contained in an object.

Explanation:

Using s= d/t

7.5 m per second

Answer:

0.905

Explanation:

right answer

The radius of the swing is 0.905 m

From the question, we are to determine the radius of the swing

Using the centripetal acceleration formula

[tex]a_{c}= \frac{v^{2} }{r}[/tex]

Where [tex]a_{c}[/tex] is the centripetal acceleration

v is the velocity

and r is the radius

From the given information,

v = 8.45 m/s

[tex]a_{c} = 78.9 \ m/s^{2}[/tex]

Then,

[tex]78.9 = \frac{8.45^{2} }{r}[/tex]

[tex]r = \frac{8.45^{2} }{78.9}[/tex]

[tex]r = \frac{71.4025}{78.9}[/tex]

r = 0.905 m

Hence, the radius of the swing is 0.905 m

Learn more on Circular motion here: https://brainly.com/question/25528860  

Answer:

The coefficient of static friction between the crate and the floor is 0.41

Explanation:

Friction Force

When an object is moving and encounters friction in the air or rough surfaces, it loses acceleration and velocity because the friction force opposes motion.

The friction force when an object is moving on a horizontal surface is calculated by:

[tex]Fr=\mu N[/tex]          [1]

Where [tex]\mu[/tex] is the coefficient of static or kinetics friction and N is the normal force.

If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:

N = W = m.g

The crate of m=20 Kg has a weight of:

W = 20*9.8

W = 196 N

The normal force is also N=196 N

We can find the coefficient of static friction by solving [1] for [tex]\mu[/tex]:

[tex]\displaystyle \mu=\frac{Fr}{N}[/tex]

The friction force is equal to the minimum force required to start moving the object on the floor, thus Fr=80 N and:

[tex]\displaystyle \mu=\frac{80}{196}[/tex]

[tex]\mu=0.41[/tex]

The coefficient of static friction between the crate and the floor is 0.41

Answer:

42,944

Explanation: 9,760 kg * 4.4 m/s2 = 42,944

Answer:

The ram has done more work because the rate at which the ram work is 1.6m/s and Hari is 1.1m/s

Answer:A

Explanation:I’m taking the test rn and I got it correct

It is a conductor that allows charge to move freely through it.

Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.

The Greek letter rho is frequently used to represent resistance, which is numerically equivalent to the resistance R of a wire-like specimen, multiplied by its cross-sectional area A, and divided by its length.

The ohm is the measurement of resistance. The ratio of area in square meters to length in meters is reduced to merely meters in the metre-kilogram-second (mks) method.

Therefore, It is a conductor that allows charge to move freely through it.

To learn more about resistance, refer to the link:

https://brainly.com/question/29427458

#SPJ5

Answer:

D

Explanation:

rusting is actually the corrosion of metals so it can't be a way to prevent itself.

Answer:

2,250 seconds or 37.5 minutes

Explanation: