8.) If a car moving at 50km/h skids 15m with locked brakes, how far does the same car moving at 100km/h
skid with locked brakes?
a. 15m
b. 30m
d. 120m
c. 60m

9.) A lever is used to lift a heavy load. When a 50N force pushes one end of the lever down 1.2m, the load
rises 0.12m. What is the approximate mass (not weight) of the load?
a. 50kg
c. 100kg
d. 500kg
b. 5kg

10.) A block and tackle is used to lift a tractor that weights 210,000N a distance of 10m above the ground. The
maximum force you are able to supply is about 700N. Assuming that you must use every bit of your maximum
force in lifting the tractor (i.e. the tractor begins to rise when you pull with 700N), what length of rope will you
have to pull?

Answer:

12

Explanation:

----------------............

The explanation on how the rudders turn the boat​ is by redirecting the fluid  which results in an opposite force aiding the motion of the boat.

This law was coined by Isaac Newton and it states that when object X exerts a force on another object Y, the object Y must exert a form of counter force which has the same magnitude but opposite in direction.

In the case of the rudder, it redirects the fluid which then exerts an equal force of the same magnitude and an opposite direction. This thereby results in the motion of the boat and is therefore the most appropriate choice.

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\(velocity = \frac{distance}{time} \)

\( \frac{(30 + 10 + 80) \times 1000}{83 \times 60} \)

\( = 0.024m.{s}^{ - 1} \)

Newton's Second Law of Motion states that the net force acting on an object is directly proportional to its acceleration. The proportionality constant, which is the object's mass, gives the equation ma = f (force equals mass times acceleration). This means that if a force is applied to an object with a certain mass, it will accelerate proportionally to the magnitude of the force.

Applying Newton's Second Law of Motion allows us to determine the force required to move an object of a certain mass a certain distance. We can also use it to calculate the acceleration of an object given its mass and the force acting on it. The second law states that the acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. If the mass of the object remains constant, the acceleration produced is directly proportional to the force applied.

The second law also tells us that if a net force is acting on an object, it will accelerate in the direction of that force. This law can be used to explain the motion of objects in both linear and rotational motion. For example, when a bat hits a ball, the force of the bat on the ball causes it to accelerate, and the ball moves in the direction of that force. In summary, applying Newton's Second Law of Motion is a powerful tool for understanding the motion of objects and how they respond to forces acting on them.

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The fill in the gap answer is given below:

   From there, it is pumped to the lungs through two vessels called the pulmonary arteries.

   These arteries are an exception to the rule since they carry oxygenated blood to the lungs.

   Gas exchange occurs in the lungs at the alveoli.

   Blood enters the left atrium of the heart.

Blood must be distributed to all of the body's cells (1). Oxygen first enters the body when inhale (2). Oxygen is carried by red blood cells (3). Deoxygenated blood travels through the vena cava (4) to the right atrium (5) of the heart. It first enters the right ventricle (6), and is pumped to the lungs for gas exchange (7), where oxygen is taken in and carbon dioxide is expelled.     From there, it is pumped to the lungs (8) through two vessels called the pulmonary (9) arteries. 10 Oxygenated blood to the Body(11), 12 Gas exchange occurs in the lungs at the Alveoli 13,    From the lungs, 14. oxygenated blood travels through the 15. pulmonary veins, and enters the 16. left side of the heart. This is also an exception to the rule as these veins carry 17. oxygenated blood to the heart. 18. Oxygenated blood first enters the 19. left atrium, then moves to the 20. left ventricle, Then it is pumped out through the aorta (21) onto the body (22) and distributed to the cells body (23).

Blood is a bodily fluid that circulates through the circulatory system of an organism, carrying oxygen, nutrients, hormones, and waste products to and from the cells. Blood is made up of red and white blood cells, platelets, and plasma. Red blood cells are responsible for carrying oxygen, while white blood cells help the body fight infections and diseases.

Therefore,  Platelets play a role in blood clotting, and plasma is the fluid portion of blood that contains proteins and other substances. Blood plays a vital role in maintaining the health and well-being of an organism.

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See transcribed text below

Directions: Summarize how blood travels throughout the body using the following terms

and the sentence frames below. Each word should be used just once.

capillaries blood  venacava left  oxygen heart  upper

eftatrium  oxygenated  lungs  pulmonary  right atrium  deoxygenated

red blood cells  inhale  pulmonary  right ventricle lungs lower  Gas exchange

ventricle  oxygenated  aorta

1 must be distributed to 2l of the body's cells, Oxygen first

enters the body when | 2 Oxygenis carried by 3,

inthe 4. Deoxygenated blood travels through the inferior and superior

5 Itfirst enters the 6. . and is pumpedto the

T From there, it is pumped to the 8 through two vessels

called the 9. areries. These arteies are an exception to the rule

since they carry 10 bloodtothe

1 2 occurs inthe lungs at the 13,

From the lungs, 14. blood travels through the

15. veins, and enters the 16. side of the heart. This is also

an exception to the rule because these veins carry 17. bloodtothe

18, Oxygenated blood frstenters the 19, then moves to the left

2 Then itis pumped out through the 21 ontothe

2 and 23 body

Human roles in energy transition are:

By taking these steps, you can actively contribute to the energy transition and be a part of the movement toward a more sustainable and clean energy future.

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Answer:

the rate at which an object cools is proportional to the difference in temperature between the object and the object's surroundings.

To state  Newton's Law of cooling we say "According to Newton's law of cooling, the speed at which an item cools is proportional to the temperature differential between the object and its surroundings.".

Generally, According to Newton's law of cooling, the speed at which an item cools is proportional to the temperature differential between the object and its surroundings.

In conclusion, Newton's Law of cooling applies to the temperature interaction of an object and its environment.

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Mercury's higher eccentricity means it has a more elongated and non-circular orbit compared to Venus.

The eccentricity of a planet's orbit refers to how elliptical or circular its orbit is. A higher eccentricity indicates a more elongated and elliptical orbit, while a lower eccentricity signifies a more circular orbit.

In the case of Mercury, having the highest eccentricity among the planets in the solar system means that its orbit is significantly more elongated and less circular compared to the other planets.

Mercury's eccentricity is approximately 0.21, which means its orbit deviates more from a perfect circle compared to Venus. Venus, on the other hand, has a relatively low eccentricity of around 0.0067, indicating a nearly circular orbit. This makes Venus' orbit much closer to being circular compared to Mercury.

The high eccentricity of Mercury's orbit leads to significant variations in its distance from the Sun throughout its orbit. At its closest approach to the Sun (perihelion), Mercury is about 46 million kilometers away, while at its farthest point (aphelion), it is approximately 70 million kilometers away. In contrast, Venus has a more stable distance from the Sun throughout its orbit due to its lower eccentricity.

In summary, Mercury's higher eccentricity means it has a more elongated and non-circular orbit compared to Venus, resulting in greater variations in its distance from the Sun during its revolution.

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Alloy steel mainly consists of a specific large number of alloying elements.

Alloy steel is formed when other elements containing metal and non-metal are introduced to carbon steel. The percentage of alloying elements will differ from 1.0% to 50%. On the basis of this percentage, alloy steel is categorised into two major types, low alloy steel and high alloy steel. This alloy shows different environmental, chemical and physical properties that can change with changes in elements used to make an alloy. this alloying can affect heat treatment conditions and mechanical properties of carbon steel. In general, the addition of impurities increases the strength of the steel.

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Reichardt detectors use motion-opponent processing to detect movement among lights in its receptive field. The correct option is (a) detect movement among lights in its receptive field.

The Reichardt detector is a neural system that is responsible for motion detection. It's made up of two photoreceptor cells that are placed next to each other. It's also known as the elementary motion detector (EMD). The concept of motion detection is based on the idea of apparent movement.In the Reichardt detector, a photoreceptor cell receives an image and sends a signal to a second photoreceptor cell that is next to it. The second photoreceptor cell is a delayed signal. When the signal from the first photoreceptor cell arrives, the two signals are compared. When the signals are aligned, it results in a signal that detects movement in a particular direction. This is known as motion-opponent processing.

Motion-opponent processing is a type of sensory processing in which neural circuits respond in opposite directions to various aspects of the sensory stimulus. This is used by the brain to detect motion. In motion-opponent processing, coding a particular direction of motion and the opposite direction using excitation and inhibition is also involved. It means that the Reichardt detector uses motion-opponent processing to detect movement among lights in its receptive field.

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Answer:

Magnetic energy can be transformed into kinetic energy in a variety of ways.

Explanation:

One way that this occurs is through electromagnetic induction. This occurs when a changing magnetic field induces an electric current in a conductor, such as a wire. This induced current creates a force that can move the conductor, thus transforming the magnetic energy into kinetic energy. This process is used in electric generators, which convert the kinetic energy of a turbine into electrical energy by turning a coil of wire inside a magnetic field.

Another way that magnetic energy can be transformed into kinetic energy is through the operation of an electric motor. An electric motor uses the interaction between a magnetic field and an electric current to create a force that can rotate a shaft, thus transforming the electrical energy into kinetic energy. Electric motors are used in a wide range of applications, including transportation, manufacturing, and household appliances.

Magnetic energy can also be transformed into kinetic energy through magnetohydrodynamics (MHD), which involves the interaction of a fluid with a magnetic field. When a fluid such as a gas or liquid moves through a magnetic field, it can generate a force that can propel the fluid, thus transforming the magnetic energy into kinetic energy. This process is used in some forms of propulsion, including maglev trains and MHD generators.

In summary, magnetic energy can be transformed into kinetic energy through the interaction of a magnetic field with a conductor, an electric current, or a fluid, which creates a force that can move an object, thus transforming the magnetic energy into kinetic energy.

In case, when two cylindrical wires of different diameters are connected in series, an emf (electromotive force) is applied across the ends.

a. The side with the smaller diameter cylindrical wire on the left will have a larger current magnitude. This is because the current density, which is defined as the current per unit cross-sectional area of the wire, is inversely proportional to the cross-sectional area of the wire. Since the left side has a smaller cross-sectional area, it will have a larger current density and therefore a larger current magnitude.

b. The potential difference magnitude is the same on both sides. This is because the potential difference between two points is determined by the emf of the battery and is independent of the wire's properties. Therefore, the potential difference between points A and B is the same on both sides of the wire.

c. The side with the smaller diameter cylindrical wire on the left will have a larger drift velocity magnitude. This is because the drift velocity of electrons in a wire is proportional to the current density, which as stated above, is inversely proportional to the cross-sectional area of the wire. Since the left side has a smaller cross-sectional area, it will have a larger current density and therefore a larger drift velocity magnitude.

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The speed of the block after the 2,60 m is determined as 6.38 m/s.

The work done on the block is calculated by applying the principle of Newton's second law of motion to determine the net work done on the block as shown below.

W = F(net)d

where;

F(net) = Fcosθ - Ff

where;

F(net) = 50 cos(30) - 4.2

F(net) = 39.1 N

The speed of the block is calculated by applying the principle of work energy theorem.

K.E = W

¹/₂mv² = F(net)d

mv² = 2F(net)d

v² = [2F(net)d] / m

v = √[2F(net)d] / m]

v = √[2 x 39.1 x 2.6] / 5]

v = 6.38 m/s

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Answer:

B. Water Cycle

Explanation:

The most important source of internal heat for the Earth today is the heat generated by radioactive decay in the Earth's mantle and core.

The most important source of internal heat for the Earth today is the heat generated by radioactive decay in the Earth's mantle and core. The Earth's mantle and core contain a variety of radioactive isotopes, including uranium, thorium, and potassium-40, which decay over time and release heat in the process.

This heat is transferred to the Earth's surface through a combination of conduction, convection, and radiation, and is responsible for a wide range of geological phenomena, including plate tectonics, volcanism, and the formation of mountains. Additionally, residual heat left over from the planet's formation also contributes to the internal heat budget of the Earth.

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According to the law of conservation of mechanical energy, if the only force acting on this pendulum is gravity, the total energy of the system is the same at a, b and c.

A, B and C are the three different positions of pendulum bob. A is the left most extreme position. B is the centre position. C is the right most extreme position.

When a pendulum bob is suspended from a rigid support, the extreme positions A and C are said to possess only potential energy where as the centre position of the bob is said to possess only the kinetic energy.

According to the principle of law of conservation of energy in pendulum, the energy can neither be created nor destroyed but can be transformed from one form to another.

Thus, the total energy of the system is the same at all the positions of the pendulum bob.

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The maximum shear force V that can be applied to the cross section is 39.6 kN.

The cross-sectional area of the beam is A = 2(50 mm)(200 mm) + 2(100 mm)(50 mm) = 14000 mm^2.                                                                                                  The maximum allowable shear stress is τallow = 6.5 MPa = 6.5 N/mm^2.                  The shear stress can be calculated as τ = VQ/It, where Q is the first moment of area, I is the second moment of area, and t is the thickness of the beam.                                                                                                                         For a rectangular cross section, Q = 2(50 mm)(200 mm)(25 mm) + 2(100 mm)(50 mm)(125 mm) = 375000 mm^3 and I = (1/12)(2)(50 mm)(200 mm)^3 + (1/12)(2)(100 mm)(50 mm)^3 = 1.8333 × 10^7 mm^4.                                                 Substituting the given values into the shear stress equation and solving for V gives V = (τallow)(It)/Q = 39.6 kN. Therefore, the maximum shear force V that can be applied to the cross section is 39.6 kN.

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Answer:

t = 30000  seconds

Explanation:

Given that,

Initial velocity of the car, u = 0

Final velocity of the car, v = 60 km = 60000 m

The acceleration of the car, a = 2 m/s²

W need to find the time taken by the car. The acceleration of the object is given by :

\(a=\dfrac{v-u}{t}\)

or

\(t=\dfrac{v-u}{a}\\\\t=\dfrac{60000-0}{2}\\\\t=30000\ s\)

So, the required time is 30000  seconds.

TNT has a heat of combustion of -3406 kJ/mol compared to sugar's -5639 kJ/mol.

what is heat of combustion?

The quantity of heat released when a specific amount of a substance undergoes burning is known as the heat of combustion, also known as the calorific value or the energy value. In most cases, the terms "heat of combustion" and "calorific value" are interchangeable. Calorific value is the term used to describe the total amount of energy released during the complete combustion of a given mass of a substance in the presence of (an adequate amount of) oxygen under typical conditions of pressure and temperature.

TNT has a heat of combustion of -3406 kJ/mol compared to sugar's -5639 kJ/mol.

TNT is an explosive because it explodes more quickly due to its lower heat of combustion. Sugar is not explosive and will take a lot longer to heat up or burn.

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Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.

In an electric circuit, energy is changed from one form to another. When a battery is connected to a fan, energy from the battery is changed into electrical energy. This electrical energy is then used to power the fan and create kinetic energy, or energy of motion, as the blades spin.

The energy from the battery is stored in the form of chemical energy. This chemical energy is then changed into electrical energy, which is the energy required to power the fan. This electrical energy passes through the fan, causing the blades to spin. As the blades spin, kinetic energy is generated in the form of the movement of the blades.

The energy in the electric circuit is constantly changing from one form to another. The battery converts chemical energy into electrical energy, and the fan converts electrical energy into kinetic energy. This is the process of energy transformation, which allows us to convert energy from one form to another in order to use it to power appliances.

The electric circuit created by the students is a simple way to illustrate this process of energy transformation. The battery provides the initial source of energy, which is then converted into electrical energy. This electrical energy is then used to power the fan and create kinetic energy. This kinetic energy is then used to move the fan

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Answer:

Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.

Connection of an electric circuit

Explanation:

The change in the back EMF when the applied voltage on the DC shunt motor is 250 volts, the armature resistance is 2 ohms, and on no load is 10 amperes, is -60 volts.

The back EMF (E) of a DC shunt motor can be calculated using the formula:

E = V - Ia × Ra

where:

V is the applied voltage (250 volts),

Ia is the armature current, and

Ra is the armature resistance (2 ohms).

On full load:

Given that the armature current on full load is 40 amperes, we can calculate the back EMF on full load:

E full load = V - Ia_full_load × Ra

E full load = 250 V - 40 A × 2 Ω

E full load = 250 V - 80 V

E full load = 170 V

On no load:

Given that the armature current on no load is 10 amperes, we can calculate the back EMF on no load:

E no load = V - Ia no load × Ra

E no load = 250 V - 10 A × 2 Ω

E no load = 250 V - 20 V

E no load = 230 V

Now, let's find the change in back EMF:

Change in E = E full load - E no load

Change in E = 170 V - 230 V

Change in E = -60 V

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Answer:

Diamagnetic materials are those that some people generally think of as non-magnetic, and include water, wood, most organic compounds such as petroleum and some plastics, and many metals including copper, particularly the heavy ones with many core electrons, such as mercury, gold and bismuth.

Paramagnetic Materials: These are metals that are weakly attracted to magnets. They include aluminum, gold, and copper. The atoms of these substances contain electrons most of which spin in the same direction but not all.

Ferromagnetic materials are those materials which exhibit a spontaneous net magnetization at the atomic level, even in the absence of an external magnetic field. When placed in an external magnetic field, ferromagnetic materials are strongly magnetized in the direction of the field.

Explanation:

An object that is negatively charged could contain only electrons with no accompanying protons is False.

Define static electricity.

When two or more bodies come into touch and then break apart, static electricity results. The transport of electrons from one atom to another is caused by this interaction between surfaces.

Protons are present in negatively charged things, but their electron count exceeds that of their protons. Positively charged particles include atoms, molecules, and ions that have fewer electrons than protons. On the other hand, a particle is considered to be negatively charged if it has more electrons than protons.

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Answer:

The weight of a person with a mass of 68.5 kg on the Moon is 109.6 N.

Explanation:

To find the weight of a person on the Moon, we need to use the formula:

Weight = Mass x Gravitational Force

On the Moon, the gravitational force is 1.6 N/kg. So, using that information:

Weight = 68.5 kg x 1.6 N/kg = 109.6 N

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(a)The critical value for a 95% confidence level is approximately 1.96. (b) A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

(a) To construct a 95% two-sided confidence interval on the mean life of the light bulbs, we can use the formula:

CI = X ± z × (σ ÷√n)

where X is the sample mean, σ is the population standard deviation, n is the sample size, and z is the critical value corresponding to the desired confidence level.

In this case, X= 1014 hours, σ = 25 hours, and n = 20. The critical value for a 95% confidence level can be found using a standard normal distribution table or a calculator. For a two-sided confidence interval, we divide the desired confidence level by 2 and find the corresponding z-value.

The critical value for a 95% confidence level is approximately 1.96. Substituting the values into the formula, we have:

CI = 1014 ± 1.96 × (25 ÷ √20)

the confidence interval on the mean life.

(b) To construct a 95% lower-confidence bound on the mean life, we can use the formula:

Lower bound = X - z × (σ ÷ √n)

Using the same values as in part (a), the lower bound can be calculated.

The lower bound from part (a) is the lower confidence bound for the mean life.

For the second part of the question, we have two confidence intervals: (38.02, 61.98) and (39.95, 60.05).

(a) To find the value of the sample mean, we take the average of the lower and upper bounds of each confidence interval. The sample mean is the midpoint of the confidence interval.

Sample mean = (38.02 + 61.98) ÷ 2 = 50

(b) One of the intervals is a 95% confidence interval, and the other is a 90% confidence interval. The interval (38.02, 61.98) is the 95% confidence interval because it is wider. A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

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Metamorphic rock: A rock changed by heat, pressure, and fluids.

Foliation: Parallel alignment of platy grains.

Burial metamorphism: A process that changes rock because of pressure with equal intensity from all sides.

Parent rock: The original rock before it metamorphoses.

Metamorphic rock: A rock changed by heat, pressure, and fluids. The word metamorphic means change in form. Metamorphic rocks are made by rocks that have been altered in some way. This can happen through heat, pressure, and fluids. Examples of metamorphic rocks include slate, gneiss, and marble.

Foliation: Parallel alignment of platy grains. Foliation is a term used to describe the parallel alignment of platy grains in a metamorphic rock. This is caused by pressure during metamorphism. The platy grains can be minerals like mica or clay.

Burial metamorphism: A process that changes rock because of pressure with equal intensity from all sides. Burial metamorphism is a process that changes rock because of pressure with equal intensity from all sides. This can happen when rocks are buried deep within the earth's crust.

Parent rock: The original rock before it metamorphoses. The parent rock is the original rock before it metamorphoses. This rock is changed into a metamorphic rock through the process of metamorphism.

To summarize, metamorphic rock is a rock that has been changed by heat, pressure, and fluids. Foliation refers to the parallel alignment of platy grains. Burial metamorphism is a process that changes rock because of pressure with equal intensity from all sides. The parent rock is the original rock before it metamorphoses.

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For x-rays, an electron source, a mechanism of accelerating the electrons to high speeds, and a target for the accelerated electron to contact with are required, and these are also components of the cathode assembly. The function of the focusing cap is to concentrate the electron beam.

To make x-rays, you need three things: an electron source, a way to accelerate the electrons to high speeds, and a target for the accelerated electron to contact with. X-rays are created when free electrons release energy when they contact with atomic particles in the target.

A cathode head, a filament, and first and second focusing tabs comprise the cathode assembly. The focusing caps are used to focus electron beams in the tube.

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The magnitude of the force exerted on the wall by the water from the fire hose is undefined without the time of impact.

To calculate the magnitude of the force exerted on the wall by the water from the fire hose, we can use the principle of conservation of momentum.

The momentum of an object is defined as the product of its mass and velocity. In this case, the water from the fire hose has a mass of 46 kg and a velocity of 40.0 m/s.

The initial momentum of the water can be calculated as:

Initial momentum = mass * velocity = 46 kg * 40.0 m/s = 1840 kg·m/s

According to the principle of conservation of momentum, when the water's horizontal momentum is reduced to zero, an equal and opposite momentum is transferred to the wall. Therefore, the change in momentum of the water is 1840 kg·m/s.

Since the change in momentum is equal to the force applied multiplied by the time of impact, and the water's horizontal momentum is reduced to zero, we have:

Change in momentum = Force * time

Rearranging the equation to solve for force:

Force = Change in momentum / time

Without the given time of impact, we cannot provide a precise value for the force exerted on the wall. To obtain the magnitude of the force, the time of impact would need to be provided or estimated.

Therefore, without additional information about the time of impact, we are unable to determine the exact magnitude of the force exerted on the wall by the water from the fire hose.

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