At one instant an electron(charge = -1.6 x 10-19 C)is moving in the xy plane , the components of its velocity beingvx = 3.0 x 105 m/s and vy=4.0x105m/s. A magnetic field of 0.8T is in the positivez direction. At that instant the magnitude of the magnetic force onthe electron is ....
(a) 0
(b) 2.9 x 10-14 N
(c) 3.8 x 10-14 N
(d) 4.8 x 10-14 N
(e) 6.4x10-14 N

The angular velocity is infinity.

it's not possible to calculate the kinetic energy change when the angular velocity becomes infinity, it's an abstract concept.

PART 1

The angular velocity of an object is given by the formula:

ω = v/r

where

v is the linear velocity and

r is the distance from the axis of rotation.

The man's initial angular velocity is:

ω = (0.37 rev/s) * (2π rad/rev)

= 2.34 rad/s

As the man moves closer to the center, his distance from the axis of rotation decreases, so his angular velocity will increase.

To find the new angular velocity, we can use the same formula:

ω = v/r

since the radius decreases to 0, the angular velocity becomes infinity.

PART 2

The change in kinetic energy is given by the formula:

ΔK = 1/2 * I * (ω_f^2 - ω_i^2)

where

For a solid cylinder, the moment of inertia is:

I = (1/2) * m * r^2

where

The moment of inertia for the merry-go-round is:

I = (1/2) * (29 kg) * (1.2 m)^2

= 15.12 kg * m^2

The change in kinetic energy can be calculated as:

ΔK = 1/2 * (15.12 kg * m^2) * (∞^2 - (2.34 rad/s)^2)

= infinity J

Note that it's not possible to calculate the kinetic energy change when the angular velocity becomes infinity, it's an abstract concept.

Read more about angular speed

https://brainly.com/question/14663644

#SPJ1

Answer:

PLEASE BE MORE SPECIFIC

Explanation:

The pathfinder is currently 3.4 m away from its initial position. Speed can be defined by the change in position of the object over time.

What is Speed?

It can be defined by the change in position of the object over time. The distance can be calculated by the formula,

\(d = s \times t\)

Where,

\(d\)- distance

\(s\) - speed

\(t\) - times -

Initially, Pathfinder moves,

\(d = 0.2 \times 20 \\\\d = 4 \rm \ m\)

Then he turns back and moves,

\(d' = 0.2 \times 3 = 0.6 \rm m\)

So the current position is:

\(D = d - d'\\\\D = 4 - 0.6 \\\\D = 3.4\rm m\)

Therefore, the pathfinder is currently 3.4 m away from its initial position.

Learn more about speed and distance:

https://brainly.com/question/541239

The concept of the pendulum is used in pendulum clocks to keep time. The pendulum swings back and forth in a continuous motion at a fixed rate that is determined by the length of the pendulum and the force of gravity.

This motion is used to regulate the movement of the clock's gears, which control the hands on the clock face.The mechanism of a pendulum clock is such that when the pendulum swings in one direction, it pushes a toothed wheel or gear, which in turn moves the other gears, causing the clock's hands to move forward.

When the pendulum swings back in the opposite direction, it again pushes the gear, causing the hands to move further forward. This cycle continues, with each swing of the pendulum causing the hands to move forward by a set amount. The length of the pendulum determines the rate at which the hands move forward, with longer pendulums causing the hands to move more slowly.

In a pendulum clock, the pendulum swings back and forth in a continuous motion at a fixed rate that is determined by the length of the pendulum and the force of gravity. This motion is used to regulate the movement of the clock's gears, which control the hands on the clock face. The pendulum clock is an improvement on the original verge escapement clocks, which were prone to errors due to the uneven force of the mainspring.The pendulum is a simple yet effective device that can keep accurate time. Its motion is governed by the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred from one form to another.

When the pendulum is pulled to one side and released, it swings back and forth, converting potential energy into kinetic energy and back again. The period of the pendulum, or the time it takes to complete one full swing, is determined by the length of the pendulum and the force of gravity. By adjusting the length of the pendulum, the rate at which it swings can be altered, allowing it to keep accurate time.

To keep the pendulum clock running accurately, it needs to be adjusted periodically. This is done by altering the length of the pendulum, either by moving a weight up or down along the pendulum rod or by turning a screw at the bottom of the pendulum bob. This alters the period of the pendulum, which in turn changes the rate at which the clock runs.

The pendulum clock is a testament to the ingenuity of humanity. By using the simple yet effective concept of the pendulum, clockmakers were able to create accurate timepieces that revolutionized the way we keep time. Today, the pendulum clock may have been superseded by more advanced technologies, but its legacy lives on in the modern clocks and watches we use every day.

To know more about kinetic energy :

brainly.com/question/999862

#SPJ11

i need the same question

Answer:

The atmosphere is composed of five layers.

Explanation:

The five layers the atmosphers is made up of are: the exosphere, the thermosphere, the mesosphere, the stratosphere, and the troposphere.

Answer:

ok it will be g+181

Explanation:

Taiga: Canada and Russia are the two countries where the taiga biome occurs in relative abundance.

Desert: The Sahara Desert is located in several countries in North Africa, including Algeria, Egypt, Libya, Morocco, and Tunisia. The Arabian Desert is located in several countries in the Middle East, including Saudi Arabia, Iraq, and Jordan.

Tropical rainforest: The Amazon Rainforest is located in several South American countries, including Brazil, Peru, Colombia, and Ecuador.

Temperate grassland: The Great Plains biome, which is a type of temperate grassland, is located in the United States and Canada.

Tropical grassland: The savanna biome, which is a type of tropical grassland, is located in several African countries, including Kenya, Tanzania, and South Africa. It is also found in parts of Australia, India, and South America.

Coral reef: Australia's Great Barrier Reef is the largest coral reef system in the world and is located off the coast of Queensland.

Temperate deciduous forest: The temperate deciduous forest biome is found in several countries in the Northern Hemisphere, including the United States, Canada, China, and much of Europe.

Tundra: The tundra biome is found in several countries in the Northern Hemisphere, including Russia, Canada, Norway, and Sweden. It is also found in parts of Alaska in the United States.

Learn more about biome: https://brainly.com/question/30256754

#SPJ11

This answer provides a list of different biomes and identifies a specific country where each biome is prevalent. The list includes Taiga (Russia), Desert (Egypt), Tropical Rainforest (Brazil), Temperate Grassland (United States), Tropical Grassland (Kenya), Coral Reef (Australia), Temperate Deciduous Forest (Germany), and Tundra (Canada).

The following biomes can be found in various parts of the world:

https://brainly.com/question/35935094

#SPJ2

Answer:

Physics

Explanation:

Explanation:

We can use the Theorem of Work (W) and Kinetic Energy (K):

W=ΔK=Kf−Ki

it basically tells us that the work done on our system will show up as change in Kinetic Energy:

We know that the initial Kinetic Energy, Ki=12mv2i, is zero (starting from rest) while the final will be equal to 352J; Work will be force time displacement. so we get:

F⋅d=Ff

45d=352

and so:

d=35245=7.8≈8m

Answer:

d= 352/45=7.8≈ 8m

Explanation

We can use the Theorem of Work (W) and Kinetic Energy (K):

W=ΔK=k f - k i , it is basically tells us that the work done on our system will show up as change in Kinetic Energy:We know that the initial Kinetic Energy, ki =1/2 mv 2/i, is zero (starting from rest) while the final will be equal to 352J; Work will be force time displacement. so we get: F . d = Ff

45d= 352 and so d= 352/45=7.8 ≈ 8m

Answer:

KE = 1.05 x105 Joules

Explanation:

KE = 4 * (1.04653 x 105 J) = 4.19 x 105 Joules.

there are 3 atoms in each silver sulfide

The required magnitude of the force that stopped Melissa's car is 118608.7 N.

According to the first law, unless a force acts on an object, it will not alter its motion. According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects interact, they exert equal-sized and opposite-direction forces upon one another.

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Given,

speed=8.133 m/s

final velocity=0 (due to impact)

time=0.3994 seconds

distance=11.01m

Then,

S = ut + (at^2)/2

a = 2(s - ut)t^2

a = 97.3 m/s^2

So,

Force = ma

Force = 1219(97.3)

Force = 118608.7 N

To know more about acceleration visit:-

brainly.com/question/12550364

#SPJ4

Answer:

When the time of fall is doubled, the height of fall will be quadrupled

Explanation:

Given;

height of fall, h = d m

time of fall, t = t s

initial velocity of the object, u = 0 m/d

The height of fall of the object is calculated from the kinematic equation below;

\(h = ut + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\h = \frac{1}{2} gt^2\\\\2h = gt^2\\\\g = \frac{2h}{t^2}\)

where;

g is acceleration due to gravity, which is constant

if the time of fall is doubled, the height of fall is calculated as;

\(\frac{2h_1}{t_1^2} = \frac{2h_2}{t_2^2} \\\\\frac{h_1}{t_1^2} = \frac{h_2}{t_2^2}\\\\(Note: h_1 = d, \ and \ t_1 = t)\\\\h_2 = \frac{h_1t_2^2}{t_1^2} \\\\h_2 = \frac{(d)(2t_1)^2}{t_1^2} \\\\h_2 = \frac{(d)(2t)^2}{t^2}\\\\h_2 = \frac{(d)\times 4t^2}{t^2}\\\\h_2 = 4d\)

Therefore, when the time of fall is doubled, the height of fall will be quadrupled

The number of electrons that corresponds to the number of charges is 2.71 × 10¹⁰ electrons.

The breakdown field strength of air is 3 × 10⁶ N/C, and the distance between the fingertip and the doorknob is 2 cm, so the electric field between the two is given by:

E = 3 × 10⁶ N/C

The electric field causes the charge on the fingertip to be drawn towards the doorknob, so we can calculate the charge on the fingertip using the formula:

q = 4π ε_0 x Er²

where;

r is the radius of the fingertip (0.71 cm) and

ε_0 is the permittivity of free space (8.854 × 10^-12 C^2/Nm²).

q = 4  x π  x 8.854 × 10⁻¹² x 3 × 10⁶  x  0.71²

q = 2.17 × 10⁻⁸ C

The charge on the doorknob is equal and opposite to the charge on the fingertip, so the total charge on both is calculated as;

Q_total =  2  x 2.17 × 10⁻⁸ C

= 4.34 × 10⁻⁸ C.

The number of electrons is calculated as follows;

number of electrons = q / e

where;

number of electrons = ( 4.34 × 10⁻⁸ C / 1.60218 × ⁻¹⁹ C )

number of electrons = 2.71 × 10¹⁰ electrons

Learn more about electric field here: https://brainly.com/question/14372859

#SPJ1

Taking into account the definition of density, the volume of the sample of gold is 0.0646998 L.

Density is defined as the property that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

19.32 g/cm³= 1250 g÷ volume

Solving:

19.32 g/cm³× volume= 1250 g

volume= 1250 g÷ 19.32 g/cm³

volume= 64.6998 cm³= 0.0646998 L (1 cm³= 0.001 L)

In summary, the volume of the sample of gold is 0.0646998 L.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

#SPJ1

Answer:

SEE below

Explanation:

MASS is a measure of the amount of matter in an object....it will remain the same ....

  WEIGHT is a measure of gravitational pull on the object and is inversely dependent on the square of the distance between the two bodies...so weight will be LESS than on the surface of the planet

Answer:

47.86 N

Explanation:

The magnetic force on a current-carrying wire in a magnetic field is given by the formula:

F = BIL sinθ

where F is the magnetic force, B is the magnetic field, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.

Substituting the given values, we get:

F = (1.99 T) x (10.7 A) x (2.22 m) x sin(40.4°)

F = 47.86 N

Therefore, the magnetic force on the wire is 47.86 N, in the direction perpendicular to both the magnetic field and the wire.

*IG:whis.sama_ent

In conclusion, obsidian is a for the hard glassy green or black rock found in the valley of Mexico and used to make razor sharp weapons. It is a natural volcanic glass that was historically used by civilizations like the Aztecs for making cutting tools and weapons. Its sharp edges made it an excellent choice for hunting and warfare.

The hard glassy green or black rock found in the valley of Mexico and used to make razor sharp weapons is called obsidian. Obsidian is a natural volcanic glass that forms when lava cools rapidly with minimal crystal growth. It has a smooth and shiny surface, and its sharp edges make it ideal for creating cutting tools and weapons.
Obsidian has been used by ancient civilizations for thousands of years due to its ability to hold a sharp edge. The Aztecs, for example, used obsidian to make weapons such as knives, spearheads, and arrowheads. These tools were highly effective in hunting and warfare.
In conclusion, obsidian is a for the hard glassy green or black rock found in the valley of Mexico and used to make razor sharp weapons. It is a natural volcanic glass that was historically used by civilizations like the Aztecs for making cutting tools and weapons. Its sharp edges made it an excellent choice for hunting and warfare.

To know more about obsidian visit:

https://brainly.com/question/32390788

#SPJ11

Answer:

The ball will be attracted to the negatively charged plate. It'll touch and pick up some electrons from the plate so that the ball becomes negatively charged. Immediately the ball is repelled by the negative plate and is attracted to the positive plate. The ball gives up electrons to the positive plate so that it is positively charged and suddenly attracts to the negative plate again, flies over to it and picks up enough electrons to be repulsed by negative plate and again to the positive plate and that continues.

The behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.

The positive ball would go toward the negatively charged plate first. After which, it would lose the positive charge and becomes negatively charged. Due to the negative charge, it will repel the negatively charged plate and will start traveling towards the positive plate this time.  

The process would continue which will create a pendulum kind of motion for the charged light metal ball between the plates, and this will continue until either of the one the positive or the negative plate became neutral (discharged).

Hence, the behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.

To know more visit:

https://brainly.com/question/3983643

Answer:

anything stationary

Explanation:

anything that is not moving outside the train like passing trees or the train's station is considered to be a frame reference.

Answer:

The correct order of answers goes:

\(\left[\begin{array}{ccc}Ionic\\Electronegativity\\Metallic\\Cation\end{array}\right]\)

Explanation:

Ionic - Ionic bonds are formed between a metal and a nonmetal (typically). Nonmetals are typically more electronegative elements because they are seeking to gain electrons to achieve atomic stability while metals want to give up electrons to those elements to become atomically stable. Therefore, the nonmetals are much more electronegative in comparison to the metals.

Electronegativity - Electronegativity is used mathematically to predict the type of bond that will occur between elements. The larger electronegativity has the smaller electronegativity subtracted from it to give us a number that we then apply to ranges within a table and try to decipher what kind of bond will be formed.

Metallic - This plays into both explanations already given. Metallic bonds will form between metals, meaning their electronegativities will be much lower. Higher differences between electronegativities (anything above 1.7) is considered ionic, while anything from 0.1 to 1.69 is considered covalent (these split to make polar and nonpolar covalence).

Cation - Cation is the term for a positively charged ion. It comes from cathode (a scientist completed an experiment with the cathode ray tube where they accelerated positively charged particles throughout it).

Answer:

20.4 \(m/s^{2}\)

Explanation:

To start doing this problem, first draw a free body diagram of the table. My teacher always tells us to do this, and I find that it is very helpful. I have attached a free body diagram to this answer- take a look at it.

First, let us see if Net force = MA. To do that, we need to determine whether the object is at equilibrium horizontally. For an object to be at equilibrium, it either needs to be moving at a constant velocity or not moving at all. Also, if an object is at equilibrium, there will not be any acceleration. But we know that there IS acceleration horizontally, so it cannot be in equilibrium. If it is not in equilibrium, we can use the formula ∑F= ma.

Let us determine the net force. Since the object is moving horizontally, we can ignore the weight and normal force, because they are vertical forces. The only horizontal forces we need to worry about are the applied force and force of friction.

Applied force = 1055 N (490 + 565)

Friction force= Unknown

To find the friction force, use the kinetic friction formula, Friction = μkN

μk is the coefficient, which the problem includes- it is 0.613.

N is the normal force, which we have to find.

*To find the normal force, we have to determine if the object is at equilibrium VERTICALLY. Since it has no acceleration vertically (it's not moving up/down), it is at equilibrium. Now, when an object is at equilibrium in one direction, it means that all the forces in that direction are equal. What are our vertical forces? Weight (mg) and Normal force (N). So it means that the Normal force is equal to the Weight.

Weight = mg = (40)(9.8) = 392 N

Normal force = 392 N

Now, plug it back into the formula (μkN): (0.613)(392) = 240.296 N

Friction = 240.296 N

Now that we know the friction, we can find the horizontal net force. Just subtract the friction force, 240.296 from the applied force, 1055 N

Horizontal Net Force: 814.704 N

Now that we know the net force, plug in the numbers for the formula

∑F= ma.

814.704 = (40.0)(a)

*Divide on both sides)

a = 20.3676 m/s^2

Round it to 3 significant figures, to get:

20.4 \(m/s^{2}\)

Answer:

Force applied

Explanation:

An object will remain at its state of rest unless a non zero for act on it

The processes that use mechanical energy as the principal energy source are Conventional milling, Ultrasonic machining,Water jet cutting So option c,d & e are  correct.

The processes that use mechanical energy as the principal energy source are:

Conventional milling: In conventional milling, mechanical energy is used to rotate the milling cutter, which removes material from the workpiece.

Ultrasonic machining: Ultrasonic machining utilizes mechanical vibrations to remove material from the workpiece. Ultrasonic energy is converted into mechanical energy to produce high-frequency vibrations that aid in material removal.

Water jet cutting: Water jet cutting employs high-pressure water streams to cut through various materials. The energy source is mechanical, as pumps are used to generate and propel the high-pressure water.

Therefore option c,d & e are correct.

1 Which of the following processes use mechanical energy as the principal energy source (three correct answers):

(a) electrochemical grinding

(b) laser beam machining

(c) conventional milling

(d) ultrasonic machining

(e) water jet cutting

(f) wire EDM

To learn more about mechanical energy visit: https://brainly.com/question/30403434

#SPJ11

Answer: The roof is 19.6 meters high.

Explanation:

As the ball rolls on the flat roof, when it starts falling down there is no initial velocity in the vertical axis, so we can define the initial vertical velocity as zero. (We define the time t= 0s as the moment when the ball starts falling down)

Now, the only force acting on the vertical axis will be the gravitational force, then the acceleration in the vertical axis is the vertical acceleration:

a(t) = -9.8m/s^2.

Now, to get the vertical velocity, we need to integrate over time, and get:

v(t) = (-9.8m/s^2)*t + v0

where v0 is the initial vertical velocity, and as we already know, this is zero.

v(t) = (-9.8m/s^2)*t

Now to get the position, we integrate again over time:

p(t) = (-4.9m/s^2)*t^2 + p0

Where p0 is the initial position, if we define the zero in the position as the ground, then p0 will be equal to the height of the roof.

p(t) = (-4.9m/s^2)*t^2 + h

And we know that the ball hits the ground at t = 2s, then we have:

p(2s) = 0m = (-4.9m/s^2)*(2s)^2 + h

           (4.9m/s^2)*(2s)^2 = h

                   19.6m = h

The height of the roof is 19.6 meters.

The constancy of the speed of light is an assumption rather than a prediction of Einstein's special theory of relativity.

Einstein's special theory of relativity is a theory that explains how objects behave when they are moving at high speeds, especially near the speed of light. The theory makes several predictions and assumptions.

Length contraction and time dilation are predictions of the theory. They describe how objects appear to change in size and how time appears to slow down when they are moving at high speeds.

The equivalence of mass and energy is also a prediction of the theory. It describes how mass and energy are equivalent and can be converted into one another.

The constancy of the speed of light is an assumption of the theory. It assumes that the speed of light is always the same, no matter how fast an observer is moving. This means that the speed of light is a fundamental constant of the universe, and it cannot be exceeded by any material object. This assumption is supported by experimental evidence and has been confirmed many times.

learn more about Speed of light here:

https://brainly.com/question/1555553

#SPJ11