Similarities and differences between thermionic emission and liquid evaporation

Answer:

hopr

Explanation:

Answer:

How do u delete your questions on this app

Answer:

1-a

2-d

3-c

4-b

Explanation:

i tookt he words and put it in the sentance and these made most sence to me

Answer:

The description of the energy of the skier at point W is,

At point W, potential energy is greatest and kinetic energy is least

Explanation:

The given parameters are;

The highest point of the skier's path = Point W

The lowest point of the skier's path = Point X

The height of the peak after point X = Intermediate between point W and point X

The potential energy of the skier, P.E. = m·g·h

The kinetic energy of the skier, K.E. = 1/2·m·v²

The total mechanical energy of the skier, M.E. = P.E. + K.E.= Constant

Where;

m = The mass of the skier

g = The acceleration due to gravity = 9.8 m/s²

h = The height of the skier

v = The velocity of the skier

Therefore, the P.E. of the skier is highest at the highest point of the skier's path which is the point W, where h = Maximum

Similarly, the potential energy of the skier will be lowest at point X which is the lowest point on the skier's path

From P.E. + K.E. = constant, the kinetic energy will be least at point W, where the potential energy is highest.

Therefore, the description of the energy of the skier at point W is that the potential energy is greatest and kinetic energy is least.

Answer:

The magnitude of the impulse is 1.4 Ns in the West direction.

Explanation:

The impulse equation is given by:

\(\Delta p=m\Delta v\)

Where:

So we will have:

\(\Delta p=0.140(25-15)\)

\(\Delta p=1.4\: Ns\)

Therefore, the magnitude of the impulse is 1.4 Ns in the West direction.

I hope it helps you!

When two surfaces touch, they exert a force that prevents the two surfaces from sliding past one another. Static friction is the name of this force.

The body's net force's strength and direction. All of the forces acting on a moving object are depicted in the free-bod diagram. Every force, in particular, is represented by an arrow, the direction of which corresponds to the force's direction and whose length corresponds to the force's magnitude. Therefore, the net force can be estimated from a free body diagram. In reality, one may calculate the net force acting in each of the two directions by examining the forces acting along the horizontal and vertical axes independently. These two forces then stand in for the constituent parts of the final force (net force) acting on the item.

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Answer:

I am afriad I don't think we can answer this one as it is asking you about your enviroment.

Explanation:

Answer:

1.02 m/s²

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 0 m/s

Final velocity (v) = 6.6 m/s

Time (t) = 6.5 s

Acceleration (a) =.?

Acceleration can simply be defined as the change of velocity with time. Mathematically, it can be expressed as:

a = (v – u) / t

Where:

a is the acceleration.

v is the final velocity.

u is the initial velocity.

t is the time.

With the above formula, we can obtain the acceleration of the car as follow:

Initial velocity (u) = 0 m/s

Final velocity (v) = 6.6 m/s

Time (t) = 6.5 s

Acceleration (a) =.?

a = (v – u) / t

a = (6.6 – 0) / 6.5

a = 6.6 / 6.5

a = 1.02 m/s²

Therefore, the acceleration of the car is 1.02 m/s²

Answer:

Heat

Explanation: The state in which no thermal energy transfer occurs because both substances are at the same temperature.

Answer:

A: Heat

I hope this helps

Answer:

Which eye structure has the greatest effect on light refraction? ... They are the ciliary muscle, which controls the shape of the lens for accommodation, and the iris, the pigmented ring of muscles that regulates the amount of light entering the eye.

Explanation:

Space heaters are the only application on the list where heat from electricity is the desired outcome. They are a convenient and efficient way to warm up a specific area or room, especially during cold weather.

The application where heat from electricity is a desired outcome is Space heater. Space heaters are designed to generate heat from electricity and warm up a specific area or room. They work by passing an electrical current through a resistive element, such as a coil of wire, which converts electrical energy into heat energy. The heat is then transferred to the surrounding air, warming up the room.

Electric clothes dryers, irons, toasters, and water pumps all use electricity to perform their respective functions, but heat is not the desired outcome. Electric clothes dryers use electricity to rotate a drum and create hot air to dry clothes. Irons use electricity to heat up a metal plate and smooth out wrinkles in clothes. Toasters use electricity to heat up metal wires and toast bread. Water pumps use electricity to circulate water through pipes or hoses.

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A ball is shot from the ground straight up into the air with initial velocity of 41 ft/sec. It takes 1.28 sec to reach its  its maximum height of 26.27feet.

a ball is shot straight up into the air with initial velocity of 41ft/sec

S = \(S_{0} +V_{t} - 16t^{2}\)

height \(S_{0} = 0\)

velocity \(V_{0}\) = 41ft/sec

S= 0+41t- 16\(t^{2}\)

S = 41t -16\(t^{2}\)

instantaneous velocity v

V = ds/dt = \(V_{0}\)- 32t

V = 41-32t

32t = 41

t =  41/32 = 1.28 sec.

S = 41t-16\(t^{2}\)

  = 41 ( 1.28)- 16 \((1.28)^{2}\)

 =  52.48 - 26.21

 = 26.27

The pace at which an object's position changes in relation to a frame of reference and time is what is meant by velocity. Although it may appear sophisticated, velocity is just the act of moving quickly in one direction. Since it is a vector quantity, the definition of velocity requires both magnitude (speed) and direction. Its SI equivalent is the meter per second (ms-1). A body is considered to be accelerating if the magnitude or direction of its velocity changes.

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Answer:

5 cm

Explanation:

Answer:

d. 0.417 m/s

Explanation:

v= ▲x/t

(350-150)/120 s

= .417 m/s

Answer:

See below

Explanation:

Heat makes the concrete expand...this expansion causes the concrete to buckle up to make room for the expanded volume

The distance δz between two surfaces separated by a potential difference δv is given by the equation δz = εAδv/Q, where A of plates, the charge stored Q, and permittivity ε of material between the plates.

The distance δz between two surfaces separated by a potential difference δv can be determined using the equation for capacitance. Capacitance is a property of a system that relates the potential difference across it to the amount of charge it can store. The formula for capacitance is given by C = Q/δv, where C represents the capacitance, Q is the charge stored, and δv is the potential difference.

If the surfaces are plates of a parallel plate capacitor, the capacitance can be expressed as C = εA/δz, where ε is the permittivity of the material between the plates, A is the area of the plates, and δz is the distance between them. By equating the two equations for capacitance, we can solve for δz:

εA/δz = Q/δv

Rearranging the equation, we find δz = εAδv/Q. This equation relates the distance δz between the surfaces to the potential difference δv, the area A of the plates, the charge stored Q, and the permittivity ε of the material between the plates.

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Answer:

B. underwater mountain range

Answer:

an underwater mountain range

The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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Answer:

Antibody molecules that are secreted by plasma cells mediate the humoral immune response. The antigen that binds to the receptor of the B-cell antigen signals B cells and is internalized and transformed into peptides that activate the armed helper at the same time.

Explanation:

Answer:

B cells

Explanation:

Humoral immunity or humoural immunity is the aspect of immunity that is mediated by macromolecules found in extracellular fluids such as secreted antibodies, complement proteins, and certain antimicrobial peptides. Humoral immunity is named so because it involves substances found in the humors, or body fluids. It contrasts with cell-mediated immunity. Humoral immunity is also referred to as antibody-mediated immunity.

Answer:

If the scale readings are different then there will be a net force on the person attached to the scales:

Consider any point on the rope - if the forces in each direction are the same there is no acceleration of the rope

F = Δm * a        for any portion of the rope with mass Δm

If any portion of the rope is accelerated, the person attached to the rope must be accelerated

The spring constant of the spring is 18.375 N/m .

What is potential energy ?

Potential energy, stored energy that depends on the relative positions of the various parts of the system.  A steel ball has more potential energy lifted across the ground than after it hits the ground. In an elevated position, he can do more work. Potential energy is a property of systems, not of single bodies or particles. For example, a system of Earth and a raised ball will have more potential energy the farther apart the two are. Potential energy arises in systems containing parts exerting forces on each other whose magnitude depends on the configuration or relative position of the parts. For the earth-ball system, the gravitational force between the two depends only on the distance separating them. The work done in separating or lifting the ball further transfers additional energy into the system and is stored as gravitational potential energy.

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Explanation:

Hey there!

The answer is Speed.

Reason:

Simply we know that distance (d) = speed*time

and speed = distance/ time. And according to the question, when a body covers certain distance/unit time, it's speed.

Hope it helps!

Answer:

Explanation:

Astronauts face a wide range of dangers when maneuvering in space. Collecting rock samples requires breaking apart rocks on the moon's surface, which requires tools. These tools are sometimes small hammers or other times special drills. All of this process means moving and using force to break these rocks apart and every single movement can cause a mistake which can lead to a piece of the suit ripping or a failure in the machinery. Since there is no oxygen on the moon the tiniest failure in the suit can lead to the death of the astronaut. Therefore, having backup safety precautions, and quick repair scenarios is a must when collecting rock samples on the moon.

Operators must have unobstructed access to a ladder for escape from a trench within a distance of 25 feet.
According to OSHA regulations, operators must have unobstructed access to a ladder for escape from a trench within 25 feet. So, the correct answer is c 25 feet.

According to OSHA Occupational Safety and Health Administration, employers must provide ladders, steps, ramps, or other safe means of egress for workers working in trench excavations 4 feet 1.22 meters or deeper1. The means of egress must be located so as not to require workers to travel more than 25 feet 7.62 meters laterally within the trench1. Therefore, the answer is c 25 feet. Operators must have unobstructed access to a ladder for escape from a trench within 25 feet. So, the correct answer is c 25 feet

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Answer:

False

Explanation: The cannonball that is faster has more force and energy therefore go longer and the cannonball with less speed will fall sooner with the lack of force and energy to carry it.

For this use the formula:

d = Vo * t - (at^2) / 2

Clearing t:

t = d/(v + 0.5*a)

Replacing:

t = 5 m / (7.2 m/s + 0.5 * (-1.1 m/s²)

Resolving:

t = 5 m / (7.2 m/s + (-0.55 m/s²)

t = 5 m / 6.65 m/s

t = 0.75 s

Result:

The time will be 0.75 seconds.

Answer:

500 Newtons

Explanation:

50 kg x 10 m/s squared

Answer:

Im not really sure lemme ask my friend he knows about this subject and when he gives me answer ill edit this

Explanation:

Answer:

i dont even know

Explanation:

I just dont know

Answer: 140

Explanation: just multiply 7 x 20

Answer:

\({FY} = \dfrac{3}{4} \times FX\)

Explanation:

The parameters given for the planets are;

The mass of planet X = M and the radius of planet X = R

The mass of planet Y = 3·M and the radius of planet Y = 3·R

The magnitude of the gravitational force of the planets on their satellites are given by the following equation;

\(F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}\)

Where;

M₁ = The mass of the first object = The mass of the planet

m₂ = The mass of the second object = The mass of the satellite

R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite

G = The universal gravitational constant

The force between planet X and the satellite in its orbit = \(FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}\)

The force between planet Y and the satellite in its orbit = \(FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}\)

Therefore;

\(\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}\)

\({FY} = \dfrac{3}{4} \times FX\)