(c) A 120 V system experiences a 10% voltage increase. Compute the change in light intensity for incandescent and compact fluorescent lamps. (5 marks)

Answer:

Opposite

Explanation:

Newton's third law of motion states that for every action there is an equal but opposite reaction.

Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move etc,

For example, while driving down the road, a firefly strikes the windshield of a car (Action) and makes a quite obvious mess in front of the face of the driver (Reaction) i.e the firefly hit the car and the car hits the firefly.

The ultimately implies that, in every interaction, there is a pair of equal but opposite forces acting on the two interacting physical objects.

Hence, whenever any physical object exerts a force (action) on another physical object, the second physical object exerts a force (reaction) of the same amount, but acting in opposite direction to that of the first physical object.

The graph shows a position - time graph of an object which is moving downhill. The object is moving with a constant speed but away from the observer.

Velocity is a physical quantity that measures the distance covered per unit time. Velocity is a vector quantity and is having both magnitude and direction.

Velocity is the ratio of distance to the time. Thus, if the change in distance is linear with the change in time, there will be no change in velocity and the object is said to be moving with constant velocity.

If the distance and time are non-linear thus, thus, change in distance is not coinciding with change in time, then the velocity changes each time. The given object is moving away from the observer and

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To determine the new force of gravity in the first scenario, we can use the formula for gravitational force:

\(Fg = (G * m1 * m2) / r^2,\)

where G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.

If we triple the mass of one object and double the distance between their centers, the new force of gravity can be calculated as follows:

New \(Fg = (G * (3m) * m) / (2r)^2.\)

Simplifying this expression, we get:

New Fg = (G * 3m * m) / (4r^2).

Since (3m * m) / (4r^2) is equivalent to (3/4) * (m * m) / (r^2), we can rewrite the equation as:

New \(Fg = (3/4) * (G * m * m) / r^2.\)

Comparing this to the original force of gravity, Fg, we see that the new force is (3/4) times the original force. Therefore, the answer is C) 0.75 Fg.

Regarding the second scenario, for objects in stable orbit, the orbital period is determined by the formula:

\(T = 2π * sqrt(r^3 / (G * M)),\)

where T is the orbital period, r is the distance between the center of the object and the center of the Earth, G is the gravitational constant, and M is the mass of the Earth.

If Satellite B is twice as far from the Earth's center compared to Satellite A, we can say that r_B = 2 * r_A.

Let's compare the orbital periods of the two satellites:

T_B = 2π * sqrt((2r_A)^3 / (G * M)) = 2π * sqrt(8r_A^3 / (G * M)).

T_A = 2π * sqrt(r_A^3 / (G * M)).

Dividing T_B by T_A, we get:

T_B / T_A = (2π * sqrt(8r_A^3 / (G * M))) / (2π * sqrt(r_A^3 / (G * M))).

Simplifying this expression, we find:

T_B / T_A = sqrt(8r_A^3 / (r_A^3)) = sqrt(8) = 2.83.

Therefore, the answer is a) 2.83 times larger.

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When two objects are experiencing gravitational attraction, if you triple the mass of one of the objects and double the distance between their centers, the new force of gravity compared to the old will be 0.75 times the original force (0.75 Fg).The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

This is because the force of gravitational attraction between two objects is inversely proportional to the square of the distance between their centers of mass. If you double the distance between two objects, the force of gravitational attraction decreases by a factor of 4 (2^2). On the other hand, if you triple the mass of one of the objects, the force of gravitational attraction increases by a factor of 3.

Therefore, combining these effects, the new force of gravity will be 3/4 or 0.75 times the original force.

Satellite A and Satellite B are both in stable orbit around the Earth, but Satellite B is twice as far from the Earth's center as Satellite A. The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

This is because the orbital period of an object in circular motion is dependent on the radius of the orbit. The further an object is from the center of the orbit, the longer it takes to complete one full orbit. Since Satellite B is twice as far from the Earth's center as Satellite A, its radius is also twice as large. The orbital period is directly proportional to the radius, so Satellite B's orbital period will be 2.83 times larger than Satellite A's orbital period.

Therefore, the correct statement is:

The new force of gravity compared to the old will be 0.75 Fg.

The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

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Answer:

1226.25 N

Explanation:

w = mg = 125 (9.81) = 1226.25 N

Answer:Work is a measurement of energy.

Power is a measurement of energy per time.

So, power measures how fast work is done.

If we raise 1kg up to a height of 1 meter it takes a certain amount of work. It doesn't matter if it takes us 1 second or 1 hour to raise it. It takes more power, energy per second, to raise it in 1 second than to raise it in one hour.

An engines power rating is in horsepower. A higher horsepower car engine will get a certain car up a hill more quickly than if it had a lower horsepower engine. Even though both engines did the same amount of work in getting the car up the hill

Answer:

work is a measurement of energy, but power is how much energy it takes. Two people could do the same amount of work. Sally and James. James may finish his work in 2 days due to the amount of power he puts in, but it may take Sally a week.

The distance from the axis of the force applied is 2.05 m.

The distance from the axis of the force applied is calculated as follows;

The formula for torque;

τ = Fr

where;

Another formula for torque is given as;

τ = Iα

where;

τ = (mr²)α

τ = (25 kg x (0.925 m)²) x (1.84 rad/s²)

τ = 39.36 Nm

The distance is calculated as;

r = τ/F

r = ( 39.36 Nm ) / (19.2 N)

r = 2.05 m

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A concave mirror is a type of optical surface that has a reflective surface that curves inward. This type of mirror is often used in optical devices, such as telescopes and magnifying glasses.

The design of these devices involves only one optical surface, the concave mirror, which is used to focus light onto a specific point or image. The curvature of the mirror determines how the light is reflected and focused, and the distance between the mirror and the object being viewed affects the magnification and clarity of the image. The simplicity of the design involving only one optical surface makes it easier to produce and maintain optical devices, and it also allows for greater precision and accuracy in the resulting images. Overall, the use of a concave mirror as the sole optical surface in a design offers a cost-effective and efficient solution for a variety of optical applications.

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Answer:

6m/s^2

Explanation:

Acceleration is the change in speed/Velocity per unit time. That means the speed divided by the time. 24m/s divided by 4s=6m/s^2

If energy is conserved, then initial (PE + KE) = final (PE + KE). So, the correct option is A.

The law of conservation of energy states that, energy can neither be created nor be destroyed, but can be transformed from one form to another.

Here,

According to law of conservation of energy,

The total energy of an isolated system remains constant. That means, the total energy of the system in the initial state will be same as that in the final state.

The total mechanical energy is the sum of kinetic energy and potential energy.

TE = KE + PE

Therefore, the energy to be conserved in the system,

Initial TE = Final TE

So, Initial (KE + PE) = Final (KE + PE)

Hence,

If energy is conserved, then initial (PE + KE) = final (PE + KE).

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These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

Have a luvely day!

Answer:

E

Explanation:

Metals (the ones used to make jewelry) are valuable, Resistant to corrosion, and retain their appearance well over long periods of time.

(Pls mark me brainliest)

Metals are often used for making designer jewelry because they have a combination of properties that make them suitable for this purpose. One important property is their ability to be shaped and bent without breaking, which makes them ideal for creating intricate designs.

This property is due to their strength and flexibility, which allows them to be manipulated into various shapes and forms. Additionally, metals are often shiny and can be polished to a high gloss, which adds to their aesthetic appeal. While some metals such as gold and silver are good conductors of electricity, their conductivity is not the primary reason for their use in jewelry making. Similarly, while metals do conduct heat, their thermal conductivity is not a major factor in their use for making jewelry. Therefore, option E, which includes both C and D, is the most appropriate answer.

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Answer:6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen

Explanation:

If bulb B  is replaced with a short circuit, it will effectively bypass the circuit that includes bulb A. As a result, the current in the circuit will increase, which may cause the bulb A to become brighter.

A circuit is a closed path or loop through which electrical current can flow. It is made up of various components that work together to allow the flow of electricity. The basic components of a circuit include a power source, such as a battery or generator, wires or conductors that carry the current, and various other components such as switches, resistors, capacitors, and diodes, which help to control and modify the flow of electricity.

When a circuit is closed, the electrical current flows from the power source through the components and back to the power source. This flow of electricity is usually measured in amperes (amps) and is controlled by the voltage of the power source and the resistance of the components in the circuit.

Circuits can be either series circuits, where the components are arranged one after the other in a single loop, or parallel circuits, where the components are arranged in multiple branches, allowing the current to flow through each component independently. Circuits are used in a wide range of electrical and electronic devices, from simple household appliances to complex computer systems and telecommunications networks.

If bulb B is replaced with a short circuit, it will effectively bypass the circuit that includes bulb A. As a result, the current in the circuit will increase, which may cause the bulb A to become brighter. However, it's also possible that the increased current could cause bulb A to burn out or even damage the circuit itself. In general, it's not recommended to create a short circuit intentionally as it can be dangerous and potentially cause damage to the electrical system.

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It will take the 10.0 hp motor 5.18 seconds to lift the 2000 lb elevator a distance of 19.3 feet.

The time it will take a 10.0 hp motor to lift a 2000 lb elevator a distance of 19.3 feet can be determined using the formula for work, which is

Work = Force × Distance.

In this case, the force is the weight of the elevator, which is 2000 lbs, and the distance is 19.3 feet. Therefore, the work done is:

Work = Force × Distance = 2000 lbs × 19.3 feet = 38600 ft-lbs

To convert the work done to time, we use the formula for power, which is

Power = Work ÷ Time.

Here, the power of the motor is 10.0 hp, which is equivalent to 7457 watts.

Therefore, we can substitute the values we have into the formula to solve for time:

Power = Work ÷ Time7457 watts = 38600 ft-lbs ÷ TimeTime = 38600 ft-lbs ÷ 7457 watts = 5.18 seconds

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The time it would take a 10.0 hp motor to lift a 2000 lb elevator a distance of 19.3 feet would be 7.01 seconds. This is calculated using the conversions and the concept of power which is work done per unit time.

To calculate how many seconds it will take a 10.0 hp motor to lift a 2000 lb elevator a distance of 19.3 feet, we need to understand the relationship between power, force, distance and time. Power (P) is the rate at which work is done, or energy is transferred. In this case, we can use the formula P = work/time. The work done in lifting the elevator can be found by multiplying the force (weight of the elevator) by the distance.

First, convert the power from horsepower to watts: 1 hp = 745.7 watts, so 10.0 hp = 7457 watts. Secondly, convert the weight of the elevator to Newtons (N), knowing that 1 lb is approximately equals to 4.448 N, thus 2000 lbs = 8896 N. Lastly, convert the distance from feet to meters: 1 foot = 0.3048 meters, therefore 19.3 feet = 5.88 meters.

The work done is therefore 8896 N * 5.88 m = 52303.68 Joules. Using the power formula P = work/time, we can rearrange to solve for time: time = work / power, thus the time taken is 52303.68J / 7457W = 7.01 seconds.

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Answer:

I think its A

Explanation:

Not 100 percent sure tho but they do go up and down in big movements.

Some sort of base either underground or really high in the air. Zombies are unintelligent so locking your doors and having a safe unreachable location will give you time to relax.

Wear protective gear when going out so that zombies cannot get you. Gas mask, armor, and a weapon to fight with are good.

Collect food, water, and oxgen in your base. Sharing is not caring and feel free to stock material in order to survive.

Answer:

explanations below

Explanation:

From the attached document, it can be seen that Stations 2 and 3 are further away from the epicenter unlike stations 1 and 4. Stations 2 and 3 are likely going to record fewer waves than the others because as the wave travel such distances, part of it are bent by the earth’s interior and some of the materials in earth also reflect some of the waves.

One revolution of the propeller corresponds to a rotation of 2π radians, so that the propeller has an initial angular velocity of

10 rev/s = (10 rev/s) • (2π rad/rev) = 20π rad/s

The propeller thus has an angular velocity ω at time t of

ω = 20π rad/s - (2.0 rad/s²) t

so that at t = 40 s, its angular speed is reduced to

20π rad/s - (2.0 rad/s²) (40 s) = (20π - 80) rad/s

Convert this to a rotation rate by dividing this result by 2π :

(20π - 80) rad/s = ((20π - 80) rad/s) • (1/(2π) rev/rad) ≈ -2.73 rev/s

which would suggest that the propeller has started to turn in the opposite direction at a rate of 2.73 rev/s.

Answer:

A I think

Explanation:

heated air molecules have a lot if pressure and they try to release that pressure by either expanding or transfering

Surprise is the facial expressions is recognized by people of all cultures.

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The height of the building if a ball is thrown upwards at 6m/s from the top of the building is 102.48m.

The height of the building in this question can be calculated using one of the equations of motion as follows:

s = ut + ½at²

Where;

According to this question, a ball is thrown upwards at 6.00 m/s from the top of a building. If the ball hits the ground 4.00 seconds after you throw the ball, the height can be calculated as follows:

s = 6 × 4 + ½ × 9.81 × 4²

s = 24 + 78.48

s = 102.48m

Therefore, 102.48m is the height of the building.

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Answer:

Liquid

Explanation:

To turn liquid into gas, you add heat, to remove heat from gas, you make liquid.

Answer:

200 N to the right

Explanation:

Explanation:

(coal burned transforming chemical to thermal)

(steam turns turbines, transforming thermal into mechanical)

Potential energy always leads to kinetic energy when it is released.

Answer:

Most energy crises have been caused by localized shortages, wars and market manipulation. Some have argued that government actions like tax hikes, nationalisation of energy companies, and regulation of the energy sector, shift supply and demand of energy away from its economic equilibrium.