An experiment is designed to test what color of light will activate a photoelectric cell the best. The photocell is set in a circuit that "clicks" in response to current. The faster the current, the more clicks per minute. In this experiment, the number of clicks in one minute is recorded for each color of light shining on the photocell. To change the color of light, a different color of cellophane is placed over the same flashlight and the flashlight is then located a specific distance from the photocell.

Which of the following was not kept constant?


the color of the light after it has passed through the cellophane
the source of the original light
the distance of the light from the photocell
the test for photocell activation

The angular velocity of the wheel at the beginning of the 4 s interval is calculated as 3 rad/s.

Given that,

Angular speed of turntable = 2.25 rad/s²

Time of motion, t = 4.0 s

Angular displacement, θ = 60 rad

The wheel's angular velocity at the start of the 4 second period is computed as follows,

θ = ωi t + 1/2 α t²

where, ωi is initial angular velocity

30 = ωi (4) + 1/2 × 2.25 ×4²

4 ωi + 18 = 30

4 ωi = 12

ωi = 3 rad/s

Thus, the angular velocity of the wheel at the beginning of the 4 s time is 3 rad/s.

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Answer:

Explanation:

A:  Screws are a simple machine that make doing work easier.

Work = W = Fd

F = W/d

So by increasing distance (d), you decrease the amount Force needed to do the work.

By applying a small rotational force (circular direction) on the screw, the axial force is amplified.  It takes less force to turn a screw around than to drive a nail straight into the wall.

B:  To make the job even easier, choose a screw with a "finer" thread.  The smaller the pitch (the distance between the screw's threads), the greater the mechanical advantage (the ratio of output to input force).  

Part A: The screw makes the student's work easier by providing a force that is directed downwards into the wall, allowing the student to secure the picture frame in place with a relatively small distance of travel.

Force is a physical quantity that is defined as the product of mass and acceleration. It is a vector quantity, meaning it has both magnitude and direction. Force is one of the fundamental concepts of physics and is responsible for the motion of objects. It is also responsible for the interaction between objects, such as the force of gravity that keeps the planets in orbit around the sun. Force can be applied to objects in order to cause them to move, accelerate, decelerate, or change direction. Force can also be used to do work, such as lifting a weight or pushing a car. Force is an important concept in physics and is used to explain many phenomena in the natural world.

Part B: A change to the screw design that would make the student's work even easier would be to use a self-tapping screw, which has a sharp point that allows it to cut its own thread into the wall, eliminating the need to pre-drill a hole. This would reduce the amount of effort required to secure the picture frame to the wall.

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Answer:

c) 3

Explanation:

Answer:

c) 3

Explanation:

through process of elimination we can find the correct row

-Row 1 says blood cells, however the picture includes lungs so we eliminate that option

-Row 2 says absorption for the first image but once again that shouldn't include lungs

-Row 4 is very obvious that it is wrong because coordination has nothing to do with the intestines

which only leaves answer c

The net electric force on particle q2 is 27.81 N.

The net force on the particle q2 is calculated by applying Coulomb's law of electrostatic force.

The force on particle q1 due to particle q2 is calculated as;

F ( 12 ) = kq₁q₂/r²

where;

F ( 12 ) = ( 9 x 10⁹ x 18 x 10⁻⁶ x 11.2 x 10⁻⁶ ) / ( 0.28² )

F ( 12 ) = 23.14 N

The force on particle q3 due to particle q2 is calculated as;

F (23) = kq₃q₂/r²

F (23) = (9 x 10⁹ x 5.67 x 10⁻⁶ x 11.2 x 10⁻⁶)/(0.35²)

F (23) = 4.67 N

The net electric force on particle q2 is calculated as follows;

F (net) = 23.14 N + 4.67 N

F (net) = 27.81 N

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Representations of Each Part are:

The objects inside the system are the two boxes, they should be circled with a dotted circle.

Free-body diagrams showing and labeling the forces (not components) exerted on each box. Draw the relative lengths of all vectors to reflect the relative magnitudes of all the forces and identify the external forces.

Sketch a graph of the net external force vs. t for each box on the same axis will using two different colors and providing a key.

Using the equation for the area of a rectangle, A= bh, the area of the rectangle between the net external force vs. time line and the x-axis on the graph created in Part C can be written as:

With words: The area of the rectangle is equal to the base times the height.

With units: A = (Fnet)(t) N × s

Re-represent the data above by creating a momentum diagram for each box on the same set axes by using two different colors and providing a key. (A momentum diagram represents the momentum of an object or system by showing the mass of the object as the width of bar on the chart, and the velocity of the object as the height of the bar.

This part whether the impulse given to the first box while it is speeding up is greater than, less than, or the same as the impulse given to the second box while it is speeding up. Impulse is the product of force and time and it is the change in momentum.

To determine the ranking of the impulse given to the two boxes, we would need to know the specific forces applied to each box and the duration of time over which those forces were applied. The impulse experienced by an object is the product of the force applied and the time over which it was applied. Without this information, it is not possible to determine whether the impulse given to the first box was greater than, less than, or the same as the impulse given to the second box.

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An object of mass m is at rest at the origin at time t = 0. After 2 s, the velocity of the object in m/s will be 8a/3m.

Given that, F(t) = a t² ---(1)

We know that, F(t) = m a(t)

m a(t) can also be written as m dv/dt

m a(t) = m dv/dt ---(2)

(as we know, acceleration is the rate of change of velocity)

Equating (1) and (2), we have,

m dv/dt = a t²

m dv = a t² dt

dv = a/m t² dt

Integrating on both sides, we have,

∫ dv = a/m ∫ t² dt

v = a/m (t³/3)

At t = 2 s, we have velocity v as v = a/m (8/3) = 8a/3m

Thus, the required velocity of the object of mass m after 2 s is calculated to be 8a/3m.

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According to the data given in the question the net force on the box is of 5 N.

All of the forces that are applied to an object are added up to form the net force. As a consequence of the fact that it (force) is a vector and therefore that two forces with identical magnitudes and opposing directions cancel each other out, the resultant force is the total of the forces, or put another way, the net force is just the total of all the forces.

Given data :

Force on box to the left side (F1) = 15 N

Force on box to the right side (F2) = 20 N

Because both forces are in opposite direction

Hence,

Net force = F2 - F1

Net force = 20 - 15

Net force = 5 N.

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Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) use a range of different cooling systems to ensure that their batteries, motors, and other components are kept at optimal temperatures.

Generally, EVs and HEVs use air-cooling systems that draw air over the components to keep them from overheating. Some EVs and HEVs also have liquid-cooling systems, which use coolant to more efficiently dissipate heat away from the components.

Additionally, some EVs and HEVs use a combination of both air and liquid cooling systems for maximum efficiency.

Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) have different cooling systems to keep their batteries and motors running optimally.

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The Hypothesis of Gregor Mendel are:

Mendel's work with his signature peas led to the description of the rules of heredity and the invention of the phrases dominant, recessive, and discrete factor (Orel 1984), which predated the concept of gene (Pisum sativum).

Working with pea plants, Gregor Mendel uncovered the rules of heredity. He reasoned that genes must exist in pairs since each child receives a set of DNA from both parents. Mendel observed how qualities from both parents may show up in offspring, and how they would be passed down as either dominant or recessive.

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Time of 6.667 seconds is required for the fan to come to rest at constant angular acceleration.

Rotational velocity, sometimes referred to as angular frequency vector, is a pseudovector that depicts how quickly an object's angular position or orientation varies over time and is termed as angular velocity.

To find:

now we know that[tex]w= 0\frac{rev}{s}[/tex] ,[tex]w0\frac{25}{3 \ }\frac{rev}{s}[/tex] and α = [tex]\frac{5}{4}\frac{rev}{8^{2} }[/tex]

t= 0-25/3 whole upon -5/4

t= 6.667s

Hence, time of 6.667 seconds is required for the fan to come to rest at constant angular acceleration.

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The complete question is :

An electric fan is turned off, and its angular velocity decreases uniformly from 500 rev/min to 200 rev/min in 4.00 s.

(a) Find the angular acceleration in rev/s^2 and the number of revolutions made by the motor in the 4.00-s interval.

(b) How many more seconds are required for the fan to come to rest if the angular acceleration remains constant at the value calculated in part (a)?

This is because light travels in a straight line, so only the students sitting directly in line with the light beam would be able to see it. When the flashlight is shone on the wall, the light reflects off the wall and spreads out, so everyone in the room is able to see the spot of light.

Light beam is a type of electromagnetic radiation that travels in a straight line. It is composed of tiny particles called photons, which carry energy and move at the speed of light. Light beams can be generated from sources such as the sun, flashlights, lasers, and other light-emitting devices. Light beams typically have a narrow diameter and can be focused in a specific direction to create very intense light. Light beams can also be used to transmit information, such as in fiber-optic cables. Light beams are used in a variety of applications, including photography, astronomy, communications, and medicine.

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The volume of water released and the height of fall strongly influences the amount of energy generated from hydropower.

Hydropower is an alternative energy for generating electrical power by utilizing water to power machines.

In simple terms, Hydropower or water power is energy produced from flowing water.

In fact, water will not decrease when it is used in the energy utilization process. The reason is, the water cycle is an infinite and continuous recharging system, hydropower is considered a renewable energy. Apart from being more go green, the use of water can support a better natural cycle but must be accompanied by supporting equipment.

Some hydroelectric power plants are powered by the kinetic energy of flowing water as it moves downstream. Turbines and generators convert energy into electricity, which is then fed to the electrical grid for use in homes, businesses, and industry.

With the presence of hydropower energy, a country especially like Indonesia which is rich in natural resources is very effective in using this natural energy to make electricity.

In addition to abundant water that can be used for free, hydropower also produces clean energy without pollution and free from air pollution. This energy source is also always renewed automatically by nature when the rainy season arrives. Therefore, so that water is not wasted, the government must provide extra proper drainage facilities both for the needs of the hydropower cycle and for drainage to the sea.

It doesn't always bear fruit, it turns out that the existence of Hydropower also has a negative side effect which needs to be an important note.

Viewed from the negative side, this water-dependent power source can damage marine life and natural resources. Migration patterns of fish will be disrupted which will eventually damage fish populations. Another consequence of hydropower is the decrease in oxygen levels in the water which endangers fish habitat. If there is no special review, the marine ecosystem will collapse so that people's lives can be disrupted.

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Answer: Sun

Explanation:

Pretty sure it's the sun because the others can't generate electrical energy

Answer:

The speed of a wave is given by the equation:

Speed = Frequency x Wavelength

Given that the frequency of the wave is 5 Hz and the wavelength is 0.75 m, we can substitute these values into the equation:

Speed = 5 Hz x 0.75 m

Speed = 3.75 m/s

Therefore, the speed of the wave generated on the slinky is 3.75 m/s.

It's important to note that the speed of a wave depends on the properties of the medium through which it travels and not on the properties of the source of the wave.

Answer:

  The speed is  3.75

Explanation:

The relationship between wavelength and frequency is described by this simple equation:

                            λ = v/f

wave length (T) = 0.75m

frequency (f) = 5Hz

                      0.75 = v / 5

                       0.75*5 = v

                      v=3.75

According to the given statement He ends up 100m to the left of its starting point.

Acceleration is the rate of change of velocity over time, or the change in speed and direction of an object. It can be measured in meters per second squared (m/s²).

He starts at rest 3 meters to the right, and after 10 seconds it is traveling 2 meters per second to the left.

To find out where he ends up, we can use the equation for distance: distance = initial velocity x time + (1/2) x acceleration x time^2.

Since the he starts at rest, its initial velocity is 0 m/s. he is moving to the left, so its acceleration is -2 m/s^2 (negative because he is moving in the opposite direction).

Therefore, the distance he  travels :

-distance = 0 x 10s + (1/2) x (-2 m/s^2) x (10s)^2

-distance = -100m

So he ends up 100m to the left of its starting point.

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To reduce fuel consumption while maintaining vehicle performance, driver comfort, and component constraints energy management control system is required in HEV.

A supervisory algorithm, also known as an energy management strategy, is necessary for hybrid vehicles to control the different parts of the drivetrain. Usually, when designing an energy management strategy, we face two challenges.

First off, the nonconvex cost function produced by the components' nonlinear behavior makes the employment of optimization techniques more challenging. There are several methods mentioned for dealing with nonconvexity.

Second, it is unknown what the future power and velocity trajectories will be. Using historical or projected vehicle velocity and road grade trajectories to forecast future trajectories could aid in finding a solution that is close to ideal.

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Answer:

H = Vy t - 1/2 g t^2     height after time t

Vy t = H + 1/2 g t^2

Vy = H / t + 1/2 g t

Vy = -1 / 3.6 + 4.9 * 3.6 = 17.4 m/s      initial vertical speed

Vx = 50 / 3.6 = 13.9 m/s

tan θ = 17.4 / 13.9 = 1.25    θ = 51.4 deg

Ball should be kicked at 51.4 deg

V = (17.4^2 + 13.9^2)^1/2 = 22.3 m/s         initial speed

As a check use range formula

R = 22.3^2 sin 102.8 / 9.80 = 49.5 m

That is slightly less than 50m as it should be since its height would be zero after being given the initial speed

As the atomic number of group 15 elements increases, the first ionization energy drops/decrease. (option 1).

The energy needed to remove one electron from an atom is known as the ionization energy.

The members of the group 15 are N, P, As, Sb, Bi, and Mc.

The initial ionization energy is the force required to expel an electron from a neutral atom in the gaseous state. The general electron configuration for the valence shell of the elements in group 15 is ns² np³, where n is the primary quantum number (the same number of the row in which the element is).

As you move lower in the group, n rises, the valence electrons are farther from the nucleus, which means that their attraction to the nucleus is diminished. As a result, as you move down in the group, the electrons will be more readily removed, requiring less energy to do so.

This enables you to forecast the following arrangement in the initial ionization energies:

N > P > As > Sb > Bi > Mc

The question is incomplete, it should be:

As the first five elements in group 15 are considered in order of increasing atomic number, first ionization energy

(1) decreases

(2) increases

(3) decreases, then increases

(4) increases, then decreases

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The two masses of the Jakku and earth are of no use. The ratio of their acceleration due on gravity is 9 : 1

Gravitational Field strength can be defined as the ratio of gravitational force to unit mass.

Given that Jakku has half the density of earth and 1/3 the radius. What is the ratio of the acceleration due on gravity on Jakku to that of Earth’s?

The acceleration due on gravity is the same as gravitational Field strength. That is,

g = GM/r²

The gravitational Field strength of Jakku of radius r/3 will be

g = GM/(r/3)²

g = GM/(r²/9)

g = 9GM/r²

The gravitational Field strength of earth of radius r will be

g = GM/r²

The mass M is the mass of the sun. The ratio of the acceleration due to gravity on Jakku to that of Earth’s will be

9GM/r² ÷ GM/r²

9/1 or 9 : 1

Therefore, the ratio of the acceleration due to gravity on Jakku to that of Earth’s is 9 : 1

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Answer:

To calculate the coefficient of kinetic friction between the block and the ramp, you would need to know the force of kinetic friction acting on the block as it slides down the ramp.

This force can be determined using the equation:

F_friction = friction_coefficient * F_norm

where F_friction is the force of kinetic friction, friction_coefficient is the coefficient of kinetic friction, and F_norm is the normal force acting on the block.

The normal force, F_norm, is equal to the weight of the block, which is the force of gravity acting on the block. This can be calculated using the equation:

F_norm = m * g * cos(theta)

where m is the mass of the block, g is the acceleration due to gravity (approximately 9.8 m/s^2), and theta is the angle of incline of the ramp.

In this case, we know the following values:

mass: 14.26 kg

angle of incline: 41 degrees

velocity: 2.361 m/s^2

By using the law of Kinetic Friction force = friction coefficient * Normal force,

friction_coefficient = F_friction / F_norm

You can then solve for the coefficient of kinetic friction by measuring the force of friction. or by measuring the acceleration of the block and using the equations of motion.

Uday Tahlan

The speed of the car in the remaining one third of the time is 25 m/sec.

The speed of the car during two-third(2t/3) of the total time= 10 m/sec

Average speed of the car during the entire journey = 15 m/sec

Let the total time taken by the car during the entire journey = t sec.

Average speed of an object is defined as the ratio of the total distance and the total time taken by the object during the entire journey.

Average speed = total distance/total time

Total distance = Average speed of the object × total time taken by the object

Total distance = 15×t = 15t

Distance covered during the 2t/3 time = 10×2t/3 = 20t/3

Remaining distance = 15t - 20t/3

= 25t/3

Remaining time = t- 2t/3 = t/3

So the speed during the remaining journey = (25t/3)/(t/3)

= 25 m/sec.

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The circumference over time and dependent on the object's distance from the axis of rotation is known as angular speed.

The angular speed of an object is the rate of change of angular distance with time. The angular speed of an object is measured in radian per second and it is scalar quantity.

Mathematically, the formula for the quantity that is determined by the circumference over time and dependent on the object's distance from the axis of rotation is given as;

ω = ( θ ) / ( t )

where;

The formula for angular speed in terms of circumference and time of motion is given as;

ω = ( 2πr ) / ( t )

Thus, the above can be called rotational speed because it depends on the object's distance from the axis of rotation.

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For weightless object, gravity is equal to centripetal acceleration. The radius of the loop is calculated as 8 km.

The property of the motion of an object traversing a circular path is known as centripetal acceleration. Any object that is moving in circle and has an acceleration vector pointed towards center of that circle is Centripetal acceleration.

As Centripetal Acceleration formula is;

a = v²/r

Given, V-  velocity =  280 m/s

And we know that for weightless object,

Gravity =  centripetal acceleration

So, a =  g

given, g =9.8 m/s²

So,9.8 = 280²/r

r= 8000 m

Radius of the loop = 8 km

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The delay vector for node F as follows:

F: [5, 2, ∞, ∞, ∞, 0, ∞, ∞]

This means that the estimated delay from node F to node A is 5, to node B is 2 and to node F itself is 0. And all other nodes are unreachable.

The Distance Vector Routing algorithm, also known as Bellman-Ford algorithm, is used to calculate the shortest path from a given source node to all other nodes in a network.

To calculate the new estimated delays from node F, we first initialize the delay vector for node F as follows:

F: [0, ∞, ∞, ∞, ∞, ∞, ∞, ∞]

Next, we update the delay vector for node F using the delay vectors received from its neighbors. For example, using the information provided in here, we can update the delay vector for node F as follows:

F: [5, 2, ∞, ∞, ∞, 0, ∞, ∞]

This means that the estimated delay from node F to node A is 5, to node B is 2 and to node F itself is 0. And all other nodes are unreachable.

We then repeat this process of updating the delay vector until the estimates converge and no further updates are required.

This is a simplified process and in real world scenario there will be more number of nodes and edges, and also the cost of each edge will be different.

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The force on the glove is 12.8 N.

Solving for the  force on the glove:

The force on the glove is equal to the impulse (change in momentum) experienced by the ball divided by the time over which the force was applied.

Impulse = force x time

              = 5.0 N x (1/8.0 m/s)

Impulse = 0.625 Ns

The change in momentum of the ball ΔP is

ΔP =  m x v

where,

m = is  the mass of the ball

v= its velocity

Momentum = mass x velocity

                   = 0.2 kg x 8.0 m/s

Momentum= 1.6 kg m/s

The force on the glove is equal to the change in momentum divided by the time over which the force was applied:

Force = change in momentum/time

           = 1.6 kg m/s

               (1/8.0 m/s)

Force = 12.8 N

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The variation of temperature 437°C ,if Sara fire in the fireplace to warm her 20°C apartment.

What temperature can I refuse to work in?

Although there's no legally defined maximum or minimum temperature for working, health and safety guidance is that a reasonable temperature should usually be at least 16°C. If much of the work involves a lot of physical effort, it's 13°C.

What temperature is too hot for humans?

People often point to a study published in 2010 that estimated that a wet-bulb temperature of 35 C – equal to 95 F at 100 percent humidity, or 115 F at 50 percent humidity – would be the upper limit of safety, beyond which the human body can no longer cool itself by evaporating sweat from the surface of the body

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Energy floating hands with a constant chill. growing desire to resist the Führer Only after he had a difficult time recovering from his push-ups.

steaming water Heat from the flame travels into the saucepan when the water boils, warming the liquid at the bottom of the pan. As the hot water rises as well as the cooled water falls to replace it, a passed through ( transmitted is produced.

Thermal energy is transferred from heated to cool places by convection. Convection is the process by which warmer portions of a gas or liquid move toward cooler areas of the same liquid or gas. Then, cooler liquid or gas replaces the heated portions that have ascended higher.

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A device that uses electrical energy as it interferes with the flow of charge is a  Reactor. Hence, option (C) is correct.

Reactance is the resistance to current flow in an AC circuit. A coil connected in series between two points in a power system is referred to as a reactor, also known as a line reactor, in order to reduce inrush current, voltage notching effects, and voltage spikes.

To adjust for a change in the load that the motor is starting, reactors can be tapped to vary the voltage across them. Ohms of impedance at a specific frequency and current are used to rate reactors.

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