Anti-lock brakes (ABS) __________
A. prevent skidding and allows drivers to steer during an emergency braking situation.
B. sense a skid and automatically apply the brakes.
C. stop the vehicle faster than normal brakes.
D. all of the above

Final answer:

The work done by movers to push a 41.0 kg crate across a rough floor for 10.6 meters against a coefficient of friction of 0.60, with no acceleration, is 2547.816 joules.

Explanation:

The student is asking about the amount of work done by movers in pushing a 41.0 kg crate across a rough floor where there is friction but without acceleration. The coefficient of friction is given as 0.60. To solve this problem, we use the formula:

Work done (W) = Force (F) x Distance (d)

Since the crate is moved horizontally with no acceleration, the force applied by the movers is equal to the frictional force, which is given by:

F = μ x Normal force (N)

The normal force is equal to the weight of the crate, which is mass (m) times the acceleration due to gravity (g), N = m x g. Therefore:

F = μ x m x g

Now, we know the mass (m=41.0 kg), acceleration due to gravity (g ≈ 9.8 m/s²), coefficient of friction (μ = 0.60), and distance (d = 10.6 m). Plugging these values in, we get:

F = 0.60 x 41.0 kg x 9.8 m/s² = 240.36 N

W = 240.36 N x 10.6 m = 2547.816 J

Therefore, the work done by the movers is 2547.816 joules.

Answer:

The maximum permissible propagation delay per flip flop stage is 100 n sec

Explanation:

1024 ripple counter has 10 J-K flip flops(210 = 1024).  

So the total delay will be 10×x where x is the delay of each J-K flip flops.

The period of the clock pulse is 1× 10⁻⁶ s.

Now

10x <= 10⁻⁶ s

x <= 100 ns

x= 100 ns for prpoer operation.

pulse train with a frequency of 1 MHz is counted using a modulo-1024 ripple-counter built with J-K flip flops. For proper operation of the counter, the maximum permissible propagation delay per flip flop stage is 100 n sec.

Answer: He didn't invent printing. He didn't even invent movable type. He often ran into legal trouble and, when he died in 1468, he did so with little money or glory.

Explanation:

The introduction of movable type printing during the Renaissance, particularly Gutenberg's press, greatly expanded access to information, decreased the cost of books, and increased literacy rates. It allowed for the spread of revolutionary ideas, facilitating movements like the Protestant Reformation and contributing to the rise of humanism and skepticism. This technological advancement changed society drastically and laid the foundation for modern information dissemination.

The Impact of Movable Type Printing During the Renaissance

The advent of printing with movable type during the Renaissance was a pivotal moment in history that dramatically changed how people accessed and consumed information. Johannes Gutenberg's advancement in Europe allowed for the mass production of texts, breaking the monopoly of knowledge held by religious and noble authorities. This innovation spurred the spread of ideas, fostering literacy, education, and the invention of print media. It contributed to major societal shifts, including the Protestant Reformation, the rise of humanism, and the challenge to traditional authorities by thinkers like Machiavelli and Galileo.

The printing press's multiplication of texts made books cheaper and more available, resulting in a significant increase in literacy rates across Europe. Schools could provide more reading material to students, and adults had easier access to a variety of writings. The flourishing of ideas and the diffusion of classical and critical texts contributed to the philosophical movement of humanism and skepticism toward established doctrines. This laid the groundwork for the development of national identities and movements such as the Protestant Reformation, where figures like Martin Luther could disseminate their ideas widely.

By 1480, nearly every large European city boasted at least one printing press, with Venice being particularly noted as a hub for printing. The design of fonts and standardized printing processes are part of Gutenberg's lasting legacy. In parallel, the consequences of this invention on knowledge and information flows are considered a precursor to the modern Age of Enlightenment and our current information age.

Answer:

The fired object at an angle of ten degrees below the horizontal

Explanation:

The second object strikes the ground first because independently of the magnitude of the speeds, this object has a speed component in the direction toward the floor allows it to reach the ground faster than the other objects.

Then the answer is:

The fired object at an angle of ten degrees below the horizontal

Answer:

3,010 W

Explanation:

mass of elevator (Me) = 1700 kg

mass of counter weight (Mc) = 840 kg

travel distance (d) = 45 m

time (t) = 2.1 min = 126 s

What average power is required of the force the motor exerts on the cab via the cable?

from Newtons second law of motion

force exerted by the elevator motor + force exerted by the elevator counter weight = force exerted by the elevator cab weight

therefore

force exerted by the elevator motor =  force exerted by the elevator counter weight - force exerted by the elevator cab weight

force exerted by the elevator motor (Fm) = (Me x g) - (Mc x g)

force exerted by the elevator motor (Fm) =  (1700 x 9.8) - (840 x 9.8)

force exerted by the elevator motor (Fm) = 8428 N

average power exerted by the motor = Fm x speed

where speed = distance / time

average power exerted by the motor = Fm x (distance / time)

average power exerted by the motor = 8428 x (45/126) = 3,010 W

Answer:c

Explanation:

When the direction of current is towards the observer then the magnetic field around it will be in the form of concentric circles and its direction will be anti-clockwise when viewed from the observer side.

Whenever current is flowing in a current-carrying conductor then the magnetic field is associated with it and direction of the magnetic field is given by right-hand thumb rule according to which if thumb represents the direction of current then wrapping of fingers will give the direction of the magnetic field                

Answer:

C. A decrease in the neural control to the gluteus medius and gluteus maximus muscles      

Explanation:

                 An ankle sprain is an injury that is caused by the twisting, rolling or turning the ankle in awkward manner. It can tear the ligaments of the bone muscles that helps to hold together the ankle bones.

                When we get an ankle sprain, the neural control of the gluteus medius as well as the gluteus maximus muscles decreases. Thereby limiting the control of the lower extremities during any functional activities.

Hence the correct option is (C).

Answer:

The sprinter need to climb 6.17 m

Explanation:

From the question,

Ep = Ek...................... Equation 1

Where Ep = potential energy, Ek = kinetic energy.

therefore,

mgh = 1/2mv².................... Equation 2

Where m = mass of the human, v = speed, h = height, g = acceleration due to gravity.

making h the subject of formula in equation 2

h = 1/2v²/g...................... Equation 3

Given: v = 11 m/s

Constant: g = 9.8 m/s²

Substituting these values into equation 3,

h = 1/2(11²)/9.8

h = 6.17 m.

Therefore the sprinter need to climb 6.17 m

Answer:

in the northern hemisphere the magnetic compass will normally indicate a turn toward the west if "A right turn is entered from a North Heading"

Explanation:

The face towards which the magnetic needle aligns are north and south magnetic poles. The magnetic compass does not work in southern hemisphere, because of the fact opposite poles attract. Exactly while turning right due to the opposite force the magnetic needle will deviate. Magnetic deviations do occur because of the presence of magnetized iron in the ship and also in aircraft. The magnetic north is not the actual or the exact north  pole.

Answer:

To minimize the practical errors and improve the accuracy.

Explanation:

Answer:

source is travelling away from the listener.

Explanation:

we know that

[tex]f_l=f_s\frac{v+v_L}{v+v_s}[/tex]

v= speed of sound

v_L= speed of listener

v_s=speed of the source

Let us consider the case when vL is zero.

We can see from equation that if we put +ve value for vs , then fL turns out to be less than fs.

(As denominator becomes greater than numerator part in right side term)

Frequency as heard by listener is less than the frequency of source when source is moving away from listener.

Therefore in this equation velocity of source is positive if the source is travelling away from the listener.

Final answer:

The velocity of the source is positive if the source is moving in the direction of the chosen reference or coordinate system. In physics, velocity is a vector quantity that not only indicates the speed of movement but also the direction of the object.

Explanation:

The velocity of a source is positive if it is moving in the same direction as the chosen positive reference direction in a coordinate system.

Therefore, a positive velocity indicates that an object is moving in the same direction that has been defined as positive in the coordinate system. Often, the positive direction is arbitrarily chosen, such as to the right or upwards on a graph. Conversely, a negative velocity indicates movement in the opposite direction of the chosen positive direction.

Additionally, if we discuss displacement, the final displacement being positive indicates that the object's position changed in the direction of the positive axis as well. The sign of velocity affects how we perceive acceleration too; for instance, if an object has a positive velocity and is speeding up, its acceleration is also positive. This means that the acceleration is in the same direction as the motion.

Answer:

Explanation:

1) Consider the vertical motion of ball

          Displacement, s =  30.2 m

          Initial velocity, u = 0 m/s

          Acceleration, a = 9.81 m/s²

 Substituting in s = ut + 0.5 at²

         30.2 = 0 x t + 0.5  x 9.81 x t²

           t = 2.48 s

    The ball is in motion for 6.16 seconds.        

2) Consider the horizontal motion of ball

          Displacement, s =  94.7 m

          Time, t = 2.48 s

          Acceleration, a = 0 m/s²

 Substituting in s = ut + 0.5 at²

         94.7 = u x 2.48 + 0.5  x 0 x 2.48²

           u = 38.16 m/s

    Initial velocity of ball = 38.16 m/s    

3) x component of velocity will not change since acceleration is zero along x direction.

       x component of velocity before hitting the ground = 38.16 m/s  

4) Consider the vertical motion of ball

          Initial velocity, u = 0 m/s

          Acceleration, a = 9.81 m/s²

          Time, t = 2.48 s

 Substituting in v = u + at

         v = 0 + 9.81 x 2.48

           v = 24.33 m/s

    y component of velocity before hitting the ground = 24.33 m/s  

Final answer:

The time the ball is in motion is 2.18 seconds. The initial velocity of the ball is 43.47 m/s. The x component of the velocity just before it strikes the ground is 43.47 m/s and the y component of the velocity is 21.36 m/s.

Explanation:

To find the time the ball is in motion, we can use the equation h = 0.5 * g * t^2, where h is the height of the building, g is the acceleration due to gravity, and t is the time. Rearranging the equation, we get t = sqrt(2h/g). Substituting the given values, the time the ball is in motion is sqrt(2 * 30.2 / 9.8) = 2.18 seconds.

The initial velocity of the ball can be found using the equation v = d / t, where v is the velocity, d is the horizontal distance, and t is the time. Rearranging the equation, we get v = d / t. Substituting the given values, the initial velocity of the ball is 94.7 / 2.18 = 43.47 m/s.

The x component of the velocity just before the ball strikes the ground is equal to the initial velocity, since there is no horizontal acceleration. Therefore, the x component of the velocity is 43.47 m/s.

The y component of the velocity just before the ball strikes the ground can be found using the equation v = u + gt, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity, and t is the time. Rearranging the equation, we get v - u = gt. Substituting the given values, the y component of the velocity is 9.8 * 2.18 = 21.36 m/s.

Answer:

option B

Explanation:

The correct answer is option B

Carbon/graphite fiber composite is a polymer composite which is five times stronger than the mild steel and five-time more lighter than it.

This material has a high-temperature resistant quality, it works as a high insulator. The material does not melt at high temperatures. And the material is also corrosive resistant but has a corrosive effect when contact with aluminum.

Hence, we can say that Carbon/graphite fiber has high stiffness, high compressive strength, and have a corrosive effect in contact with aluminum.

Final answer:

Carbon/graphite fiber composites are known for their stiffness, high compressive strength, and ability to conduct electricity, characteristics derived from the structure of graphite itself.

Explanation:

The characteristics of carbon/graphite fiber composites are influenced by the structure of graphite itself. Graphite is structured in layers of carbon atoms connected in a hexagonal lattice. Each carbon atom in graphite forms three σ bonds with neighboring carbon atoms using sp² hybridized orbitals, and the fourth unhybridized p orbital participates in bonding, spreading the electron density over the entire layer, which allows the material to conduct electricity.

Due to the weak van der Waals forces holding the layers together, graphite is soft and has lubricating properties, allowing the layers to slide over each other easily. This structural characteristic of graphite is crucial in forming composites that often possess properties such as stiffness, high compressive strength, and the ability to conduct electricity.

Answer:

Neptune is approximately 41 times as far from the sun as Venus

Explanation:

Estimate = distance of Neptune from the sun ÷ distance of Venus from the sun = 4.5×10^9 ÷ 1.18×10^8 = 40.9 (approximately 41)

Neptune is approximately 41 times farther from the sun than Venus.

The best estimate of how many times as far from the sun Neptune is as Venus is approximately 40 times.

To find this, you can divide the distance of Neptune from the sun by the distance of Venus from the sun:

Neptune distance / Venus distance = 4.5*10^9 km / 1.1*10^8 km = 41

Answer:

Heating of a fluid bulk from the bottom.

Explanation:

Whenever a fluid bulk is heated form the lower layers then due to the variation of the density of the fluid at different temperature we observe the movement of molecules leading to convection.

The situation that primarily involves heat transfer by convection is when a fluid (liquid or gas) moves and carries heat energy along with it.

Convection is a mode of heat transfer that occurs through the movement of a fluid. It involves the transfer of heat by the actual movement or circulation of the fluid particles. Convection typically occurs in liquids and gases, where the particles can freely move.

Similarly, natural convection occurs when heated air or fluid rises due to its lower density compared to the surrounding cooler air or fluid. This can be observed, for instance, in the circulation of air near a hot stove or the movement of hot water in a boiling pot.

Convection is also prevalent in weather phenomena such as ocean currents and winds, where the movement of fluids carries heat energy from one region to another.

Overall, situations that involve the transfer of heat through the movement of fluids, whether natural or forced convection, primarily involve heat transfer by convection.

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Answer:

Two estimates

Explanation:

There are mainly two estimates used in the calculation of depreciation such as the useful life and the salvage value of an asset. The salvage value is defined as the predicted amount that will be obtained by a company from an asset when it is disposed at the end of the useful life of the particular asset. On the other hand, the useful life commonly refers to the estimation of how long the asset is useful for the company. This is different from the lifespan of the asset.  

Answer:  The correct answer is :  There are several methods to calculate depreciation, such as: straight line, activity or units produced, sum of annual digits and double share on the decreasing value.

Explanation:  The most commonly used methods are, the linear method, where the original cost of an asset is divided by its estimated useful life to find the amount to be amortized each year and also the accelerated depreciation method is used in which more depreciation is provided the first years of useful life of the asset and for the remaining years a lower depreciation is assigned. This method in turn can be: doubly decreasing balance (200%), 150% decreasing balance, 125% decreasing balance and digits of the sum of the years.

Answer:

Technician B

Explanation:

Two technicians are discussing the IAT sensor. Technician A says that the IAT sensor is more important to the operation of the engine (higher authority) than the ECT sensor. Technician B says that the PCM will add fuel if the IAT indicates that the incoming air temperature is cold. Who is right?

ECT is the engine coolant temperature

The Intake Air Temperature sensor (IAT) records the temperature of the air entering the engine. The engine computer (PCM)  estimates air density so it can balance air air/fuel mixture.PCM will add fuel if the IAT indicates that the incoming air temperature is cold

Answer:

14 billion light years away

Explanation:

v = Recessional velocity = 70km/s/million parsec

D = Proper distance

Hubble constant

[tex]70\ km/s=3260000\ ly\\\Rightarrow 1\ km/s=\dfrac{3260000}{70}\ ly[/tex]

From Hubble's law we have the relation

[tex]v=H_0D\\\Rightarrow D=\dfrac{v}{H_0}\\\Rightarrow D=\dfrac{3260000}{70}\times 300000}\\\Rightarrow D=13971428571.42857\ ly[/tex]

The distance in light years of the galaxy is 14 billion light years away

Answer:Work

Explanation:

When a spring is compressed the energy changes from kinetic to potential energy as Energy cannot be destroyed but can be transformed from one form to another.

This can be best explained with the help of work. Suppose a block with certain kinetic energy comes in contact to the spring its kinetic energy changes to Potential Energy of the spring or we can say that its Kinetic Energy is converted to Potential energy as the block does work on spring.  

Block compresses the spring by changing its length and it requires some work which is equal to change in its Potential Energy of spring.

Answer:

A) Work

Explanation:

I just took the test

Answer:

4820.9 J of work is done on the flight bag.

Explanation:

Given:

Force acting on the bag is, [tex]F=30.0\ N[/tex]

Displacement of the bag caused by the force is, [tex]S=250.0\ m[/tex]

Angle between the direction of force and direction of displacement caused is, [tex]\theta = 50\°[/tex]

Now, the formula to calculate work done on a body by a force 'F' causing displacement 'S' at an angle [tex]\theta[/tex] between the two vectors is given as:

[tex]W=FS\cos \theta[/tex]

Plug in the given values and solve for work done 'W'. This gives,

[tex]W=(30.0\ N)(250.0\ m)(\cos 50)\\W=4820.9 \textrm{ N-m or 4820.9 J}[/tex]

Therefore, the work done on the flight bag is 4820.9 J.

Answer:

Explanation:

When loading muzzle-loading firearm it is important to eliminate any air space between the projectile and the powder charge because it may create dangerous pressure build inside the muzzle.  

The high amount of Pressure build-up may backfire the bullet and may cause harm to the fireman. It creates a high magnitude impulse on the fireman which can be dangerous for his body parts. High pressure may also explode the gun powder on the spot and causes a fire.

Answer:

D. the dinosaurs appeared and came to dominate large-scale terrestrial life

Explanation:

The Mesozoic Era is a time in Earth history when

D. the dinosaurs appeared and came to dominate large-scale terrestrial life

The Mesozoic Era is the dinosaur age and lasted from approximately 250 to 65 million years ago for nearly 180 million years. This era includes three well-known periods called the periods of Triassic, Jurassic, and Cretaceous. A mass extinction marked the Mesozoic Era's beginning and end.

Answer:

2.17*10^9 Hz

Explanation:

Suppose a manufacturing error occurred and the oven was made 4.0 cm longer than specified in part (a). In this case, the frequency of the microwaves for which there are five antinodal planes of the electric field along the width of the oven is calculated as shown below.

In the given question, we have the following variables:

speed = c = 3*10^10 cm/s

wavelength = λ = 12.2+(4/2.5) = 13.8 cm

Using the equation that relates frequency, wavelength, and speed. We have:

f = c/λ = 3*10^10/13.8 = 2.17*10^9 Hz

Therefore, the frequency of the microwave is 2.17*10^9 Hz.

Answer:

Constipation

Explanation:

An organism's bowel movement depends on the amount of water it has consumed. If the organism has not consumed enough water then the stool becomes hard and dry.

This makes it difficult for the organism to pass the stool. This condition is known as constipation.

Hence, here if the water content is reduced to 20 percent then this would likely result in constipation.

Answer:

time taken = 6 secs

Explanation:

Power (P) = Force(F) * displacement(d)/ TIME (t)

    75= 225 * 2.0/t

t= 225*2/75

t= 6 sec

Answer:

Weight = 4900 N

Explanation:

Given:

Mass of the piano is, [tex]m=500\ kg[/tex]

Acceleration due to gravity is, [tex]g=9.8\ m/s^2[/tex]

Height to which the piano is raised is 8.0 m.

We are asked to determine the weight of the piano.

We know that, weight of a body is nothing but gravitational force acting on it by the center of Earth. It is equal to the product of mass and acceleration due to gravity.

Weight is independent of height til the height is very less than the radius of Earth. At very high altitudes which are comparable to the radius of Earth, the value of 'g' changes and hence the weight. But, here the height is very small and hence the value of 'g' equals 9.8 m/s² only.

Thus, weight of the piano is given as:

Weight = Mass [tex]\times[/tex] Acceleration due to gravity

Weight = [tex]mg[/tex]

Weight = [tex](500\ kg)(9.8\ m/s^2)=4900\ N[/tex]

Weight is a force so, its unit is same as that of force and hence it is measured in Newtons.

Therefore, the weight of the piano is 4900 N.

The force on a wire carrying [tex]8.75\ A[/tex] is a maximum of [tex]1.28\ N[/tex] when placed between the pole faces of a magnet. The strength of the magnetic field is [tex]0.207\ T[/tex].

The force (F) experienced by a current-carrying wire in a magnetic field is given by the formula:

Force (F) = Magnetic Field (B) × Current (I) × Length (L) × sin(θ)

Given data:

Force [tex](F) = 1.28\ N[/tex]

Current[tex](I) = 8.75\ A[/tex]

Length [tex](L) = 55.5\ cm[/tex]

To find the magnetic field strength (B).

Assuming the wire is placed perpendicular to the magnetic field (θ = 90°), sin(90°) = 1, and the equation simplifies to:

[tex]B = F / (I \times L)[/tex]

Convert the length from centimeters to meters (1 cm = 0.01 m):

[tex]Length (L) = 55.5\ cm \times 0.01\ m/cm \\L = 0.555\ m[/tex]

Now, plug in the values and calculate B:

[tex]B = 1.28 / (8.75 \times 0.555)[/tex]

Calculating gives approximately:

[tex]B = 0.207\ T[/tex]

Therefore, the strength of the magnetic field is 0.207 teslas.

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Final answer:

To find the strength of the magnetic field, use the formula for magnetic force on a current-carrying wire with the given values to calculate the approximate field strength. The magnetic field's approximate strength is 4.85 T.

Explanation:

The strength of the magnetic field can be calculated using the formula for magnetic force on a current-carrying wire:

B = F / (I * L * sinθ),

where B is the magnetic field strength, F is the force on the wire, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.

Substitute the given values: I = 8.75 A, F = 1.28 N, L = 55.5 cm = 0.555 m, and sinθ = 1 (as the wire is perpendicular to the magnetic field).

Calculating, we find that the approximate strength of the magnetic field is around 4.85 T.

Answer:

more vulnerable to icing

Explanation:

The main disadvantage of float-type carburetor is its susceptibility to icing which occurs when there is fuel vaporization and decrease in air pressure in the venturi, which causes a sharp temperature drop in the carburetor. This fuel vaporization occurs within the cylinder of a fuel-injected engine and makes fuel injection system less susceptible to icing.

Float-type carburetor systems are more prone to carburetor ice compared to fuel injection systems due to the nature of their design. With regard to carburetor ice, float-type carburetor systems are generally considered to be more susceptible to icing than fuel injection systems.

Carburetor ice occurs when moisture in the air freezes at the narrow throat of a carburetor during the fuel vaporization process, which can lead to engine malfunction or failure. The design of float-type carburetors, where fuel is mixed with air before it enters the intake manifold, creates conditions that are conducive to icing, particularly in cold and damp conditions. Fuel injection systems, on the other hand, typically introduce fuel further downstream and usually directly into the combustion chamber or just before the intake valve, which reduces the likelihood of ice formation. Furthermore, these systems operate without the need for a venturi or carburetor throat, minimizing the potential for ice to form within the system.

Answer:

About 8 kpc

Explanation:

The milky way galaxy is the galaxy we live in. Its composed of the solar system, billion stars, gas, dust and dark matter.

At its center it contains a super massive black hole called Sagittarius. This object is millions of times as massive as the sun.

The sun is about 8 kpc to the center of the milky way galaxy, this is about 26,000 light years away.

1000 parsecs distance is approximately 3262 light years.

A light year is the distance light can travel in a period of 1 year.

Answer:

C) As Sachin Tendulkar is short in height himself, these genes of short height may get transferred in to his children. Most likely.

Explanation:

All the above options except one cannot be genetically determined.

A) This option is absolutely absurd because how can Sachin Tendulkar's information determine who is children are gonna marry

B)It cannot  be determined.

C) As Sachin Tendulkar is short in height himself, these genes of short height may get transferred in to his children. Most likely.

D) Sachin Tendulkar is a famous batsman that does not mean his children also have to be famous batsmen