The force behind electron movement is called
A. voltage B. current C. resistance D. ohm​

Answer:

(1) An object that’s negatively charged has more electrons than protons.

(2) An object that’s positively charged has fewer electrons than protons.

(3) An object that’s not charged has the same number of electrons than protons.

Explanation :

Objects have three subatomic particles that are Electrons, protons, and neutrons.

Protons and neutrons are found in the nucleus and electrons rotate or move outside the nucleus. Naturally, protons are positively charged, neutrons have no charge, and electrons are negatively charged.

Therefore, an object that is negatively charged has more electrons than protons.  An object that is not charged has the same number of electrons than protons. An object that is positively charged has fewer electrons than protons.

Answer:

50.176m ; 31.36m/s ; 31.36m/s

Explanation:

Given the following :

Time (t) = 3.2s

Height(s) of the building

The initial velocity (u) will be 0

Using the equation:

S = ut + 0.5at^2

Acceleration due to gravity (a) = g = +9.8m/s^2 (downward)

S = 0*t + 0.5(9.8)(3.2^2)

S = 0 + 50.176

S = 50.176m

B.) speed impact when it touches the ground:

v^2 = u^2 + 2aS

where v is the final Velocity

v^2 = 0^2 + 2(9.8)(50.176)

v^2 = 0 + 983.4496

v = √983.4496

v = 31.36m/s

C) Speed of throw from the ground to reach the top of the building

Here we need the initial velocity

Height (s) = 50.176m

Acceleration due to gravity g = a = - 9.8m/s ( upward)

Using the third equation of motion:

S = ut + 0.5at^2

50.176 = u*3.2 + 0.5(-9.8)(3.2^2)

50.176 = 3.2u - 50.176

50.176 + 50.176 = 3.2u

100.352 = 3.2u

u = 100.352 / 3.2

u = 31.36m/s

Answer:

10 floors

Explanation:

We are told that a bell of mass 20 kg is atop a tower and has 8829 J of gravitational energy. The question asks us to estimate the number of floors the tower has.

To do this, we must first calculate how high above the ground the bell is. We can do that using the formula for gravitational potential energy:

\(\boxed{g.p.e = mgh}\),

where:

• g.p.e = gravitational potential energy (8829 J)

• m = mass of object (20 kg)

• g = acceleration due to gravity (approximately 10 m/s²)

• h = height of object above ground (? m).

Using the above information and formula, we can solve for h:

g.p.e = \(20 \times 10 \times h = 8829\)

       ⇒ \(200 h = 8829\)

       ⇒ \(h = \frac{8829}{200}\)

       ⇒ \(h = \bf 44.145 \ m\)

Therefore the bell is 44.145 m above the ground, which means that the height of the tower is also 44.145 m.

One floor of a building can be estimated to be around 4.3 m, therefore the number of floors the tower has is:

44.145 ÷ 4.3

≈ 10

Therefore there are 10 floors in the tower.

Answer: D

Explanation: The weather is making the Bits of rock and the glaciers are moving it so that is weathering.

A pendulum bob with a mass of 0.15 kg and a speed of 3 m/s has a kinetic energy at the low point of its swing of 0.675 J.

Kinetic energy is the energy that an item has as a function of motion. A force must be applied to an object in to accelerate it. We must engage considerable efforts in order to apply a force. After the task is finished, energy is transferred to the item, which then moves at a new, constant speed.

For calculation:

kinetic energy at low point,

kinetic energy = mass in kg / velocity in m/s

now,

putting the value in given formula,

kinetic energy = 0.15 / 33

                         =0.675J

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Changes in electric potential energy depend on the magnitude and sign of the charges involved and the distance between them. The greater the magnitude of the charges or the closer they are, the greater the electric potential energy.

The sign of the charges also determines the direction of the electric field and the direction of the potential energy change. When comparing changes in electric potential energy, it is important to consider both the magnitude and the direction of the change.

If the charges involved have opposite signs, bringing them closer together will result in a decrease in electric potential energy because the charges will be moving towards a position of lower potential energy.

On the other hand, if the charges have the same sign, bringing them closer together will result in an increase in electric potential energy because the charges will be moving towards a position of higher potential energy.

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Answer:

The circuit in series has a greater resistance.

Explanation:

The current is forced to flow throw two resistors instead of just one as it if it were in parallel.

The value of the uniformly distributed load W (kN/m) acting over the entire length of an 8 m long simply supported beam is  2 kN/m using bending moment at the midpoint is 16 kN-m.

To find the value of the uniformly distributed load W (kN/m) acting over the entire length of an 8 m long simply supported beam, we need to use the given information: bending moment at the midpoint is 16 kN-m.

1. The formula for the maximum bending moment (M) of a simply supported beam with a uniformly distributed load (W) acting over the entire length (L) is:

M = (W * L^2) / 8

2. We are given M (midpoint bending moment) = 16 kN-m and L (length) = 8 m. We need to find the value of W (uniformly distributed load).

3. Substitute the given values into the formula:

16 = (W * 8^2) / 8

4. Solve for W:

16 = (W * 64) / 8

16 * 8 = W * 64

128 = W * 64

W = 128 / 64

W = 2 kN/m

So, the value of the uniformly distributed load W is 2 kN/m.

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The time taken for the light to reach you, given that you are 150000 meters away is 0.0005 second

From the question given above, the following data were obtained:

The time taken for the light to reach you can be obtained as illustrated below:

Speed = distance / time taken

300000000 = 150000 / time taken

Cross multiply

300000000 × time taken = 150000

Divide both sides by 300000000

Time taken = 150000 / 300000000

= 0.0005 second

Thus, we can conclude that the time taken is 0.0005 second

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An image from which light rays appear to diverge is called a virtual image. In the case of a virtual image, the light rays do not actually converge at a physical point, but they appear to originate from a specific location when traced backward. This occurs when the light rays appear to originate from behind the optical system or when they are not physically intersecting.

A common example of a virtual image is the image formed by a plane mirror, where the reflected rays appear to diverge from a point behind the mirror, creating a virtual image that appears to be behind the mirror

it self. I apologize for the confusion. An image from which light rays appear to diverge is a convex lens. When parallel rays of light pass through a convex lens, they appear to diverge or spread out. This is because the lens causes the light rays to refract (bend) away from the central axis, causing them to diverge after passing through the lens. The point where the diverging rays appear to originate is called the virtual focus, and it is located on the same side of the lens as the object. The image formed by a convex lens is a virtual image that appears to be located on the same side as the object and is formed by the extension of the diverging rays backward.

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All of the following are examples of aerobic exercise except weightlifting, yoga, and stretching exercises.

aerobic exercise is a type of physical activity that increases your heart rate and breathing for an extended period. It helps improve cardiovascular health, endurance, and overall fitness. Some common examples of aerobic exercises include:

These activities involve large muscle groups and can be sustained for a longer duration. They require oxygen to produce energy and help improve the efficiency of the cardiovascular system.

However, there are certain activities that are not considered aerobic exercises. These include weightlifting, yoga, and stretching exercises, as they do not elevate the heart rate and breathing to the same extent as aerobic exercises.

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A transient voltage is a sudden and temporary increase in voltage or current that occurs in an electrical circuit. It can be caused by a number of factors, including lightning strikes, switching operations, or other types of electrical disturbances.

One common type of transient voltage is the "inductive kick" that occurs when loads with coils, such as motor starters and motors, are turned off. This occurs because the magnetic field created by the coil collapses, which can cause a high voltage spike in the circuit. Lightning strikes can also create transient voltages, which can damage electronic equipment and cause power outages. It is important to protect electrical systems against transient voltages by using surge protectors and other protective measures.

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The measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

Option C.

The median is the middle point in a dataset—half of the data points are smaller than the median and half of the data points are larger.

To find the median: Arrange the data points from smallest to largest. If the number of data points is odd, the median is the middle data point in the list.

So from the given data of the 100 meter dash, the measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

The median will help to separate half of the data points that are smaller than the cutoff time and half of the data points are larger than the cutoff time.

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The mass of ball 1 is 0.43 kg.

The mass of ball 1 is calculated by applying the principle of conservation of linear momentum as shown below.

m₁u₁  +  m₂u₂ = m₁v₁  + m₂v₂

where;

99m₁ + 0.55 (0) = m₁(0) + 0.55 (78 )

99m₁  = 42.9

m₁  = 42.9 / 99

m₁  = 0.43 kg

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Magnetic objects are either drawn to or pushed away by magnetism. When two magnets with the same poles are positioned close to one another, they push apart and repel. When two dissimilar poles are positioned close to one another, they pull and attract to one another.

A soft iron core makes up an electromagnet. You may alter the magnetic field's strength. Simply cutting off the electricity will demagnetize an electromagnet. Reversing the polarity is possible.

A unique class of magnets called electromagnets has the following characteristics: By switching the direction of the current flow, the polarity of the magnets may be changed. They function as magnets when an electric current is passing through them; they are transient magnets that may be turned on and off.

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The distance between P and Q is 11.2 km.

From the figure, we can find that,

∠PQT = 90°- 47°.

a) Consider the right-angled triangle ΔQPT,

tan(PQT) = PT/PQ

tan 43° = 12/PQ

Therefore,

PQ = 12/tan43°

PQ = 12/0.932

PQ = 11.2 km

b) Consider the right-angled triangle ΔPQR,

PQ = 11.2 km

PR = 16 km

Applying Pythagorean theorem,

QR = √(PR²- PQ²)

QR = √(16²- 11.2²)

QR = √130.56

QR = 11.4 km

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Attaching the image file here.

Answer:

The work done by the worker on the object is 255 J

Explanation:

Work is defined as the force that is applied on a body to move it from one point to another.

When a net force is applied to the body or a system and this produces displacement, then that force is said to perform mechanical work. This work can be positive if the system gains energy or negative if the system loses energy.

In the International System of Units, work is measured in Joule. Joule is equivalent to Newton per meter.

The work is equal to the product of the force by the distance and by the cosine of the angle that exists between the direction of the force and the direction that travels the point or the object that moves.  

In this case, the angle between the force and the displacement is 0 degrees. Then the cosine of 0 degrees will have a value of one. So work is calculated as the multiplication between force and distance:

W= 17 N* 15 m

Solving:

W= 255 J

The work done by the worker on the object is 255 J

Answer:

I = 1.62 w/m^2

Explanation:

wavelength = 625 nm

position of screen = 3.00 m past the slit

Determine the intensity of the light

I = \(I_{0} ( sin\frac{\beta }{2 } /\frac{\beta }{2} )^2\)  

β = 2π*Dsin∅ / л

\(I_{0}\)  = 2

Attached below is the remaining part of the solution

The light is brighter in a battery-powered torch, you should change the wattage or power rating of the bulb. A higher-wattage bulb will produce more light and therefore be brighter. When selecting a new bulb for the torch, make sure to choose a bulb with a higher wattage rating than the current bulb.

A battery is an electrochemical device that converts chemical energy into electrical energy through a chemical reaction. It consists of one or more electrochemical cells, each of which contains a positive electrode (cathode), a negative electrode (anode), and an electrolyte that allows ions to move between the two electrodes.

During the discharge process, a chemical reaction takes place within the battery that causes electrons to flow from the negative electrode through an external circuit to the positive electrode, generating an electrical current. This current can then be used to power a wide range of electrical devices, such as flashlights, smartphones, and cars. The chemical reaction can be reversed by recharging the battery, which involves applying an external electrical current to the electrodes to force the reaction to occur in the opposite direction.

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Answer:

Explanation:

In physics, work can be described as force multiplied by the displacement of the object (distance caused by the force acted on the object).

Work is a form of energy, therefore, it is measured in joules.

If Alex pushed on an object with 10N of force, and the object moved 2 meters, the work of Alex will be equal to:

W = Ft

W = 10N * 2m

W = 20 Joules

But, if we have John, that pushed on an object with 2N of force, but, since the object was way smaller, therefore it had way less inertia, the object moved a distance equal to 10 meters. Let's also calculate his work.

W = Ft

W = 2N * 10m

W = 20 Joules

And we got the same result.

Work can also be used to calculate power.

Power is equal to P = Work / time

It can also be written as P = delta Work / delta time

Power is measured in joules per second.

With power you can make the difference between someone that got a 2 kg object up in 2 second, and someone that got a 2 kg object up in 5 second.

The more powerful one would be the one who managed to make the same work in less time.

Hope it Helped!

Work is described as: the measure of energy transfer resulting from the application of force over a displacement.

In the field of physics, work is most accurately defined as the outcome of multiplying the force exerted on an object by the distance the object is displaced in the same direction as the force.

This calculation serves to quantify the energy transferred to or from the object. For instance, if an individual applies a 50 Newton force to push a box across a 5-meter distance in the force's direction, the work done on the box would equal 250 Joules (50 N × 5 m).

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(a) The magnitude of force F is 9 N.

(b) The tension between block A and B is 11.76 N.

Since the blocks are identical and the strings are all the same length, we can assume that the tension in the string between blocks A and B and between blocks B and C are the same.

Let's call this tension T.

To find the magnitude of force F, let's first consider the forces acting on block C.

The tension in the string between blocks B and C is 3 N, and there is no friction, so the net force on block C is 3 N to the right.

Since all the blocks are connected, the same force is acting on block B, and therefore the net force on block B is also 3 N to the right.

Similarly, the net force on block A is 3 N to the right. Since there are no other forces acting on the system, the net force on the entire system (the three blocks and the strings) must be equal to F.

Therefore, we can write:

F = 3 N + 3 N + 3 N = 9 N

Since the mass of each block is 0.4 kg, we can use Newton's second law (F = ma) to relate the net force on each block to its acceleration. Since the blocks are connected, they all have the same acceleration.

Let's call this acceleration a.

For block A, we have:

T = ma

For block B, we have:

T = ma

Since the tensions are the same, we can set these two equations equal to each other and solve for a:

ma = ma

Dividing both sides by m, we get:

a = a

This means that the acceleration of the blocks is the same as the acceleration due to gravity, which is approximately 9.8 m/s^2. Now we can use this value of a to find the tension T:

For block A, we have:

T - mg = ma

where;

Substituting a = g, we get:

T - (0.4 kg)(9.8 m/s^2) = (0.4 kg)(9.8 m/s^2)

T = (0.4 kg)(9.8 m/s^2) + (0.4 kg)(9.8 m/s^2)

T = 7.84 N + 3.92 N

T = 11.76 N

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Answer: B

Explanation:

The disk has mass 110 kg and radius 3.8 m is he value of the full angular momentum of the woman-disk machine is 9,759.7 kgm²/s.

The given parameters;

Mass of the woman, M = 50kg angular pace of the disk, w = 0.8rev/s

Mass of the disk, radius, r = 4.3m m = 110kg

The value of the full angular momentum of the woman-disk machine is calculated as follows;

I t =I disk omega+I woman

I t =(I disk +I woman )

\(I t =( 1/2 x m x r ^ 2 + M x r ^ 2I \\t = (1/2 x 110 x 4.3 ^ 2 + 50 x 4.3 ^ 2) *\)

\(I t = (1941.45kg x m ^ 2) x 5.0%I t =9, 759.7kg x m ^ 2\)/

Thus, the value of the full angular momentum of the woman- disk machine is 9,759.7 kgm²/s

\(t = 9.759 * 0.7ka m ^ 2.\)

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Answer:

5 seconds

Explanation:

25 x 5 = 125

When the hall probe is placed in a 1.3 T field, it will read a potential difference of 0.54 μV.

To find the potential difference across the electric field created by the displacement of charge, we can use the formula:
V = B * d * E
where:
V is the potential difference,
B is the magnetic field strength,
d is the thickness of the material, and
E is the electric field strength.

In this case, the hall probe is calibrated to read 0.75 μV when placed in a 1.8 T field. We can use this information to find the electric field strength (E).
0.75 μV = (1.8 T) * d * E

Now, we can find E by rearranging the equation:
E = 0.75 μV / (1.8 T * d)

Next, the hall probe is placed in a 1.3 T field. We can use the electric field strength we just calculated to find the potential difference (V) in this field.
V = (1.3 T) * d * E

Substituting the value of E, we get:
V = (1.3 T) * d * (0.75 μV / (1.8 T * d))

Simplifying, the thickness (d) cancels out:
V = (1.3 T) * (0.75 μV / 1.8 T)

Now, we can calculate the value of V using the given values:
V = (1.3 T) * (0.75 μV / 1.8 T)
 = 0.54 μV

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Answer:

5 m

Explanation:

formula,

speed = frequency x wavelength

speed / frequency = wavelength

sub in values

65/ 13 = wavelength

5 m = wavelength

hope this helps please mark

Answer:

As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle.

Answer:

60.0m im sorry if im wrong but this is what i got

Explanation:

Answer:

The Answer Is 60 m

Explanation:

Distance d = ?

Time t = 15 s

Average speed vavg = 4.0 m/s

You can rearrange the equation vavg = d/t to solve for distance travelled d.

vavg = d/t

d = vavgt

= (4.0 m/s) (15s)

= 60 m

Given,

The initial velocity of the car, u=13.6 m/s

The final velocity of the car, v=0 m/s

The distance covered by the car, d=0.321 m

From the equation of the motion,

On rearranging the equation,

This is the acceleration of the car which brings the car to rest after the collision.

On substituting the known values,

From another equation of the motion,

On rearranging the above equation,

On substituting the known values,

Thus the car comes to stop in 0.0472 seconds.

Answer:

Yes, in case of uniform velocity

Explanation:

This is the case of uniform velocity. If a body covers equal displacement in equal intervals of time, then the velocity of a body is said to be ‘Uniform Velocity’. It meas that the velocity of a body remains constant during the motion and it does not change.

Since, acceleration is defined as the rate of change of velocity.

Therefore, if there is no change in velocity or in other words the change in velocity is zero, then the acceleration is also zero.

a = ΔV/t = 0/t

a = 0 m/s²

So, the acceleration of the body is 0 m/s², but it has a uniform velocity

Hence, it is possible for an object that, object with zero acceleration have velocity, which is the case case of uniform velocity.