11. The speed limit on expressways is 100km/h. If you see something on the road ahead of you, as you
are driving along, it usually takes about 10 seconds for the brakes to be fully applied. How far with the car travel in that time, in metres? (2 marks)

A little metal needle that is magnetized internally and is free to rotate in any direction makes up a compass. As a result, when a magnetic field is present.

A magnetic field is what?

field of magnetism. Submitted by: Magnetic forces can be seen in a magnetic field, an electric current, a changing electric field, or a vector field around a magnet. ’s magnetic needles and other magnets align in the directions of magnetic fields like the one found on Earth.

How does magnetic force work?

Due to their velocity, electrically charged particles can attract or repel one another magnetically. It is the fundamental force that drives phenomena like the operation of electrical motors and the interest of magnets to iron. Electrically charged particles are forced to move in a circular or helical pattern by magnetic fields.

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Answer:

by movement of the bones of the middle ear and by differences in the surface area of the eardrum versus the oval window.

Explanation:

The net force that acts on the plane's 106 kg pilot is 151.58N.

The net force acting on an object is the result of all pushing and pulling forces acting on the object collectively (the sum). If there is an imbalance in the pushing and pulling forces acting on an object, the object will accelerate in the direction of the net force.

All forces acting on an object are added together to form the "net force." If the object is not moving, then this net force must be equal to zero, according to Newton's First Law.

acceleration a = F/m

a =  38700/ 26900

a = 1.43m/s²

F = ma

F = 106×1.43

F = 151.58N.

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Answer:

A

Explanation:

Coulomb's Law: A physical law that states the electric force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.

The time taken by the box to reach the velocity of 2 m / s will be 4 sec.

Force is defined as the external effort or agent applied to the object in a particular direction to displace it from one position to another position. The force is measured in a Newton.

Given that the force applied is 5 N and the velocity is 2 m / s. The mass of the object is 10 kg.

The time required by the object to get the velocity of 2 m/s will be calculated as:-

Force x Time = m x V

Time = ( m x V ) / F

Time  = ( 10 x 2 ) / 5

Time = 4 sec

Hence, the time will be equal to 4 seconds.

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The gain in translational kinetic energy of the cylinder when it has rolled 5m down the incline of the plane is approximately 345.6 J.

Given data:

Diameter, d = 0.20 mRadius,

r = 0.10 mMass of cylinder,

m = 12 kgInclined angle, θ = 37°

Distance traveled by cylinder, s = 5m

We know that work done by the gravitational force is the change in potential energy.

W=Fhsinθ... (1)

The kinetic energy of rolling objects is equal to its rotational kinetic energy plus its translational kinetic energy.

K = 1/2Iω² + 1/2mv²... (2)

The moment of inertia of a solid cylinder I=mr²/2.

Using conservation of energy principle:

Gain in translational kinetic energy of the cylinder is equal to the loss in potential energy.

Thus,

½mv²=mgH-mgSins....(3)

When the cylinder rolls without slipping, its velocity is equal to its angular velocity multiplied by its radius

v=ωr

Therefore, the rotational kinetic energy can be expressed as

1/2Iω²=1/2mr²ω²/2.... (4)

Using equations (1), (2), (3), and (4),

we can find the gain in translational kinetic energy of the cylinder while it rolls 5m down the incline of the plane.

K=1/2mv²=1/2m(v=ωr)²=1/2mr²ω²/2=1/2Iω²=1/2(12)(0.10)²(2/2)=0.12J... (5)

Potential energy, P=mgh=mgSins=12(9.8)(5)sin37°=294.2 J... (6)

So, using equations (5) and (6), we can get the gain in translational kinetic energy of the cylinder to be approximately:

K = 294.2 J – 0.12 J = 294.08 J

Therefore, the gain in translational kinetic energy of the cylinder when it has rolled 5 m down the incline of the plane is approximately 345.6 J.

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Answer:

force is the total impact of one object on another, whereas pressure is the physical quantity of force spread over a certain area.

Explanation:

hope it helps <33

have a good day :)

brainliest plz?

Explanation:

: A force can be a push or a pull. When a force is exerted on an object it can change the object's speed, direction of movement or shape.

: Pressure is the amount of force per unit of area

Pressure can be found using the equation pressure = force / area

Explanation:

600 ÷ 60 = 10

1500 ÷ 10 = 150 minutes

I don't know how you should express the answer in:

So it's either 150 minutes or 2 hours and 30 minutes.

(This is kind of like mathematics, not physics)

Answer:

Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant pest and weeds

The resistance of the heating element is 9 Ohms

Ohm's law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. Mathematically, this can be expressed as:

V = IR

In this scenario, we are given the power (P) and current (I) of a heater, and we are asked to find its resistance (R). Power can be calculated using:

P = IV

where V is the voltage across the heater. Since we are not given the voltage, we can rearrange Ohm's law to solve for the resistance:

R = V/I

Substituting the formula for power into this equation, we get:

R = (V/I) = (P/I²)

Substituting the given values of power and current, we get:

R = (325 W) / (6.0 A)² = 9.0 Ohms

The correct answer is (D).

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According to Ohm's Law, the relationship between current (I), voltage (V), and resistance (R) is given by the equation: I = V/R.

Given:

Current (I1) = 100 milliamperes = 100 mA = 0.1 A

Resistance (R1) = 1 kiloohm = 1000 ohms

Resistance (R2) = 500 ohms

To find the current in the load when the resistance is decreased to 500 ohms, we can use the equation I2 = V/R2, where I2 is the new current and V is the voltage.

Since the current source is providing a constant current, the current (I1) will remain the same regardless of the resistance change. Therefore, we can set I1 = I2.

Using Ohm's Law, we can rearrange the equation as V = I * R.

For the initial situation:

V1 = I1 * R1

For the new situation:

V2 = I2 * R2

Since V1 = V2 (the voltage provided by the current source remains the same), we can set them equal:

I1 * R1 = I2 * R2

Substituting the given values:

0.1 A * 1000 ohms = I2 * 500 ohms

Solving for I2:

I2 = (0.1 A * 1000 ohms) / 500 ohms

I2 = 0.2 A

Therefore, when the resistance is decreased to 500 ohms, the current in the load will be 0.2 amperes or 200 milliamperes.

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The electric field has an angle of 0 degrees and a magnitude of 2546.35 N/C.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to a system of charged particles' physical field. Each location in space where a charge exists in any form can be considered to have an electric field attached to it. The electric force per unit charge is another name for an electric field. E = F/Q is the formula for the electric field. Volts per meter is the SI unit for the electric field. The Newton's per coulomb unit is the same as this one. Newton is a unit of force and Coulomb is a unit of energy in these derived units.

Here,

E=kq/r^2

r= 5 x r^2 = 7.07 cm or .0707 m

E=(9 x 10^9)(1 x 10^-9)/(.0707)^2

= 1800.5 N/C

Now to find the x component,

cos 45 = x/1800.5

x= 1273.18 N/C

Now just multiply by 2 to accommodate both charges,

E=2546.35 N/C in direction of 0 degrees

The electric field has a magnitude of 2546.35 N/C and an angle of 0 degrees.

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Answer:

nevermind

Explanation:

The force on the 6 coulomb charge is 30 N.

To determine the force on a 6 coulomb charge between the plates of a capacitor with an electric field of 5n/c, we can use the formula F = qE, where F is the force, q is the charge, and E is the electric field.

Therefore, the force on the 6 coulomb charge can be calculated as follows:
F = (6 C) x (5 N/C)
F = 30 N

Therefore, the force on the 6 coulomb charge is 30 N.

The force on a 6 coulomb charge between the plates of a capacitor with an electric field of 5n/c is 30 N.

The force on a charge within a capacitor can be calculated using the formula F = qE, where F is the force, q is the charge, and E is the electric field. In this case, the force on a 6 coulomb charge between the plates of a capacitor with an electric field of 5n/c is 30 N.

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The minimum velocity the roller-coaster need when going over the 12 m  to make it to the top of the 30 m hill is equal to 18.78 m/s. Therefore, option (D) is correct.

Energy can be transformed from one to another but can neither be created nor destroyed. Energy is present in nature in several forms such as heat, nuclear energy, electricity, chemical energy, and so on.

If every form of energy is considered, then the total energy of an isolated system remains constant. This law of energy applies to all types of energy in our universe.

From the law of conservation of energy, the energy of the roller-coaster goes:

\({\displaystyle \frac{1}{2} mv^2 +mgh_1 = mgh_2\)

Given the height of the first hill, h₁ = 12m

The height of the second hill, h₂ = 30 m

The gravitational acceleration, g = 9.8 m/s²

We can find the value of the minimum velocity of the roller-coaster from the above equation:

\({\displaystyle \frac{1}{2} v^2 +gh_1 = gh_2\)

0.5 × v²  + (9.8) × 12 = (9.8) × 30

0.5 v² = 176.6

v = 18.78 m/s

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Answer:

2.66 m/s to the right

Explanation:

Applying,

The Law of conservation of momentum,

For elastic collision,

mu+m'u' = mv+m'v'................. Equation 1

Where m = mass of Car A, m' = mass of car B, u = initial velocity of car A, u' = Initial velocity of car B, v = Final velocity of car A, v' = Final velocity of car B

make v the subject of the equation

v = (mu+m'u'-m'v')/m.................. Euqation 2

Note: Assuming Left direction is positive and right direction is negative.

Given: m = 67.3 kg, m' = 65.2 kg, u = 5.65 m/s, u' = -3.2 m/s, v' = 5.38 m/s

Substitute these values into equation 2

v = [(67.3×5.65)+(65.2×[-3.2])-(65.2×5.38)]/67.3

v = (380.245-208.64-350.776)/67.3

v = -179.17/67.3

v = -2.66

Hence v = 2.66 m/s to the right

The energies of the first four rotational levels of 1H127I can be calculated using the formula:

E = B(J(J+1))

where B is the rotational constant, J is the rotational quantum number, and h and c are Planck's constant and the speed of light, respectively.

The rotational constant can be calculated using the moment of inertia formula I=μR^2 as follows:

B = h/(8π^2cI)

where h is Planck's constant, c is the speed of light, and I is the moment of inertia.

Substituting the given values we get:

μ = mHmI/(mH+mI) = (1.0078 amu * 126.9045 amu)/(1.0078 amu + 126.9045 amu) = 1.002 amu

I = μR^2 = (1.002 amu)(160 pm)^2 = 0.004921 kg m^2

B = h/(8π^2cI) = (6.626 x 10^-34 Js)/(8π^2 x 3 x 10^8 m/s x 0.004921 kg m^2) = 2.921 x 10^-23 J

Using the formula above, the energies of the first four rotational levels are:

E1 = B(1(1+1)) = 2B = 5.842 x 10^-23 J

E2 = B(2(2+1)) = 6B = 1.7526 x 10^-22 J

E3 = B(3(3+1)) = 12B = 3.5051 x 10^-22 J

E4 = B(4(4+1)) = 20B = 5.842 x 10^-22 J

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Answer:

Gravity

Explanation:

Gravity keeps the sun and planets in their orbits without it the planets would fall.

Answer:

Gravity holds all the planets in orbit.

Answer:

In this section, we elaborate and extend the result we derived in Potential Energy of a System, where we re-wrote the work-energy theorem in terms of the change in the kinetic and potential energies of a particle. This will lead us to a discussion of the important principle of the conservation of mechanical energy. As you continue to examine other topics in physics, in later chapters of this book, you will see how this conservation law is generalized to encompass other types of energy and energy transfers. The last section of this chapter provides a preview.

The terms ‘conserved quantity’ and ‘conservation law’ have specific, scientific meanings in physics, which are different from the everyday meanings associated with the use of these words. (The same comment is also true about the scientific and everyday uses of the word ‘work.’) In everyday usage, you could conserve water by not using it, or by using less of it, or by re-using it. Water is composed of molecules consisting of two atoms of hydrogen and one of oxygen. Bring these atoms together to form a molecule and you create water; dissociate the atoms in such a molecule and you destroy water. However, in scientific usage, a conserved quantity for a system stays constant, changes by a definite amount that is transferred to other systems, and/or is converted into other forms of that quantity. A conserved quantity, in the scientific sense, can be transformed, but not strictly created or destroyed. Thus, there is no physical law of conservation of water.

Systems with a Single Particle or Object

We first consider a system with a single particle or object. Returning to our development of (Figure), recall that we first separated all the forces acting on a particle into conservative and non-conservative types, and wrote the work done by each type of force as a separate term in the work-energy theorem. We then replaced the work done by the conservative forces by the change in the potential energy of the particle, combining it with the change in the particle’s kinetic energy to get (Figure). Now, we write this equation without the middle step and define the sum of the kinetic and potential energies, K+U=E; to be the mechanical energy of the particle

I can’t understand your question

The sickle cell allele is still common in tropical regions because it provides protection against malaria, which is prevalent in those areas.

A cell is the basic unit of life and the smallest structure that can perform all the functions necessary for life.

The sickle cell allele is still common in tropical regions because it provides protection against malaria, which is prevalent in those areas. Malaria is caused by a parasite that is transmitted by mosquitoes, and it infects and destroys red blood cells.

Individuals who carry one copy of the sickle cell allele (known as sickle cell trait) are more resistant to malaria than those who do not have the allele. This is because the sickle-shaped red blood cells that result from the sickle cell allele are less hospitable to the malaria parasite than normal red blood cells.

However, individuals who carry two copies of the sickle cell allele (known as sickle cell disease) can experience serious health complications, including pain, anemia, organ damage, and early death.

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Answer:

The x - component of the normal force is equal to 1706.45 N.

Explanation:

To solve the problem, and since there is no additional information, we can safely assume that the x-axis is parallalel to the hill surface and the y-axis is perpendicular to the x-axis. Knowing that, we can calculate the components of the normal force (or weight for this case), using the following formulas:

\(N

x

=W∗Sin(α)=mg∗Sin(α)\)

\(N

y

=W∗Cos(α)=mg∗Cos(α)\)

Now, using the given information, we have:

\(mass=m=1150Kg\)

\(a=8.70\)

\(g=9.81 \frac{m}{ {s}^{2} } \)

Calculating, we have:

\(N_{x}=mg*Sin(\alpha)\)

\( \: \: \: \: \: \: \: \: \: N_{x}=1150Kg*9.81\frac{m}{s^{2}}*Sin(8.70\°)\)

\(N

x =11281.5

s

2

Kg.m

∗Sin(8.70\°) = \\ \\ 1706.45

s

2

Kg.m

=1706.45.23N\)

Hence, we have that the x-component of the normal force is equal to 1706.45 N.

Answer:

zero

Explanation:

fx=

Answer:

7.5m/s

Explanation:

Law of conservation of momentum: momentum in a system before collision equals to that after collision/

5kg*3m/s=2kg*v

15kgm/s=2kg*v

v=7.5m/s

The central region of the Milky Way, specifically the galactic bulge and halo, contains mostly old (Population II) stars and globular clusters. Population II stars are older, metal-poor stars that formed early in the universe's history, primarily consisting of hydrogen and helium.

These stars have lower masses and are typically found in globular clusters, which are densely packed, spherical collections of stars that orbit the galactic center.

The galactic bulge is the central, elongated region of the Milky Way, characterized by its high concentration of stars, gas, and dust. Population II stars are more abundant in this area due to their age and the early formation of the Milky Way. Similarly, globular clusters are often found in the bulge due to their strong gravitational pull towards the center of the galaxy.

In contrast, the galactic halo is the outermost region of the Milky Way, encompassing both the galactic disk and the bulge. While the halo is relatively sparse compared to the bulge, it is still home to a significant number of Population II stars and globular clusters. These ancient stars and clusters in the halo provide crucial insights into the formation and evolution of our galaxy.

In summary, the central region of the Milky Way, including the galactic bulge and halo, contains a majority of the old (Population II) stars and globular clusters, reflecting the early history and development of our galaxy.

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The name of the substance is silver based on the specific heat capacity value.

The specific heat capacity of the substance is calculated by applying the following formula for heat capacity.

Q = mcΔθ

where;

c = Q / mΔθ

The specific heat capacity of the substance is calculated as;

c = (5875 J ) / ( 500 g x 50 )

c = 0.235 J/kgK

The substance that has the same specific heat capacity calculated above is silver.

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Answer:

45 m

Explanation:

Use Big Five #5 with v0 = 0 (calling down the positive direction).

The term "metric system" refers to a set of formulas used to determine an object's mass, length, and volume.

The inch, foot, yard, and mile are the foundational units for measuring length or distance in the English system. Rod, furlong, and chain are some other units of length. foot of the survey The English metric system normally measures areas in square feet or square yards.

Four distinct measuring scale types are seen (nominal, ordinal, interval and ratio). The information about the variables being assessed that is provided by each of the four scales is often more than that of the scales that come before it.

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Answer:

False.

Explanation:

Mass is the amount of matter in a given object. Weight is the force acting on an object due to gravity.

Answer:

False

Explanation:

Weight is the act of pulling an object towards the earth surface so weight is a force to amount

Answer:

1.2 A

Explanation:

From the diagram attached, The three resistors are parallel because the each ends of the resistors are connected together. Since they are in parallel, the voltage across each resistor is the same. The voltage source connected in parallel to the resistors is 60 V. Therefore the voltage across the 50 Ω resistor is 60 V. Using ohm law:

Voltage (V) = Current (I) × Resistance (R)

V = IR

I = V/R

I = 60 V/ 50 Ω

I = 1.2 A

The current in the 50 Ω resistor is 1.2 A