if the speed of a car is increased by 50%, bywhat factor will its minimum braking distance be increased, assuming all else is the same?

Answer:

Los generadores eléctricos funcionan según el principio de inducción electromagnética. Una bobina conductora (una bobina de cobre enrollada firmemente sobre un núcleo de metal) se hace girar rápidamente entre los polos de un imán tipo herradura. La bobina conductora junto con su núcleo se conoce como armadura.

Answer:

it is 17 dollars .

Explanation:

I had a test like this and I remember the qeustions

A 9.0-V battery costs $3.00 and will deliver 0.0250 A for 26.0 h before it must be replaced. then the cost per kWh is $512.82.

Energy is nothing but the ability to do work. there are different energies in different form which are thermal energy, mechanical energy, electric energy and sound energy etc. According to first law of thermodynamic, Energy neither be created nor be destroyed. it can only be transferred from one form into another form. Energy is expressed in joule (J). its dimensions are [M¹ L² T⁻²].

The energy delivered by the battery can be calculated using the formula:

energy = power x time

where power is the product of voltage and current, and time is given in hours.

The power delivered by the battery is:

power = voltage x current = 9.0 V x 0.0250 A = 0.225 W

The time for which the battery will deliver this power is 26.0 hours.

So, the energy delivered by the battery is:

energy = power x time = 0.225 W x 26.0 h = 5.85 Wh

To convert Wh to kWh, we divide by 1000:

energy = 5.85 Wh ÷ 1000 = 0.00585 kWh

The cost per kWh can be calculated by dividing the cost of the battery by the energy delivered, and then multiplying by 1000 to convert to dollars per kWh:

cost per kWh = (3.00 dollars / 0.00585 kWh) x 1000 = 512.82 dollars/kWh (rounded to two decimal places)

Therefore, the cost per kWh for this battery is $512.82.

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A bulk mean temperature of 25°C for air can be considered a reasonable assumption in many cases, but it depends on the specific context and location.

The assumption of a bulk mean temperature of 25°C for air can be a reasonable approximation in certain scenarios. However, it is important to note that air temperatures vary significantly based on factors such as geographic location, time of year, and local climate patterns. In some regions and during certain seasons, an average temperature of 25°C might be quite accurate.

For example, in tropical regions or during summer months in temperate areas. However, in other locations or during different seasons, this assumption may not hold true. In colder climates or during winter months, the average air temperature could be significantly lower than 25°C. Similarly, in hotter regions or during heatwaves, the average temperature might be considerably higher. Therefore, when considering the bulk mean temperature of air, it is essential to take into account the specific circumstances and obtain accurate data for the particular location and time period of interest.

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Warmer, less dense material rises.

Explanation:

This happens when heat transfers.

The sound would have a wavelength of about  9.8 * 10^-3 m.

The wavelength is a characteristic of a wave that describes the distance between two successive points in the wave that are in phase, or the distance over which the wave's shape repeats. It is typically denoted by the Greek letter lambda (λ) and is measured in meters (m) or other units of length.

Given that the speed of sound in air is 343 m/s

v= λf

λ = v/f

λ =  343 m/s/3.5x10^4 Hz

λ =  9.8 * 10^-3 m

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Answer: (C)

Explanation:  (B) is the weight of the box acting downwards

(A) is the frictional force acting on the box because of moving forward against the plane

(D) is the force that moves the box forward

( C) is perpendicular to the box which means it is at 90 degrees with the box. Normal usually means at 90 degrees

Answer:

500 N

Explanation:

From the question,

Sum of clockwise moment = sum of anti clockwise moment.

F×d = F'×d'.................. Equation 1

Where F = Force applied to lift the load, d = distance, F' = Force required, d' = distance of the required force from the fulcrum

Make F' the subject of the equation

F' = F×d/d'.................. Equation 2

Given: F = 1200 N, d = 25 cm, d' = 60cm.

Substitute these values into equation 2

F' = 1200×25/60

F' = 500 N.

Hence the force required to balance the load is 500 N

The vibrational frequency of the child is 0.270 Hz.

The vibrational frequency of the child can be calculated by dividing the number of complete back and forth vibrations by the time taken to complete them.

Frequency = Number of vibrations / Time taken

The child makes 5 complete back and forth vibrations in 18.5 seconds, so the frequency can be calculated as:

Frequency = 5 / 18.5 = 0.27027 Hz

Rounding off to three significant digits, the vibrational frequency of the child in the swing is 0.270 Hz. The unit for frequency is hertz (Hz).

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A succession of waves in the water traveling at a speed of 144 m/s are each 24.0 m from peak to crest and passing an observer at a rate of 6.0 waves per second.

The wavelength (the horizontal distance between two crests or troughs), amplitude (the vertical distance between a dip and a crest), and wave velocity are crucial wave parameters (the speed at which wave crests move across the water).

A wave's tallest points are known as its crests. The term "troughs" refers to the wave's lowest points. The amplitude, A, is the distance from equilibrium to the crest (or trough). The wavelength,, is the separation between one crest and the next (or from one trough to the next).

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Answer:

It is D.

Explanation:

Sound travels by the movement of particles bumping against each other and if there is no particles in a vacuum(space) then there is no sound. Light can travel through space because it doesn't need to travel by/through particles.

Answer:

effort = 266.66N

VR and efficiency are 8 and 37.5% respectively.

Explanation:

Given data: four pulley system, load = 800 N, Mechanical advantage MA = 3

we have to calculate both velocity ratio and efficiency

If there are n movable pulleys connected to a fixed pulley then

VR = \(2^{n}\)

In the given question there are 4 pulleys in which one must be fixed and 3 movable

Therefore, VR = 2^3 = 8

Also, MA = Load/ effort

⇒ 3= 800/effort

⇒ effort = 266.66N

Also we know that

Efficiency = MA/VR

⇒Efficiency = 3/8 = 37.5%

Therefore, VR and efficiency are 8 and 37.5% respectively.

Answer:

1st One (The tendency of objects to keep doing what they are doing)

Explanation:

Inertia is simply the tendency of an object to keep on doing whatever it is doing. It is the natural tendency of an object to stubbornly maintain its state of motion.

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The value of n for a Bohr orbit with a radius of 1.00 mm is approximately 137.

In the Bohr model of the hydrogen atom, the radius of the electron orbit is given by the formula:

r = (0.529 Å) * n^2 / Z

Where:

r is the radius of the orbit

n is the principal quantum number

Z is the atomic number (which is 1 for hydrogen)

Given that the radius of the orbit is 1.00 mm, we can convert it to angstroms (Å) since the Bohr radius is typically expressed in angstroms. 1 mm is equal to 10,000 Å.

r = 1.00 mm = 10,000 Å

Plugging the values into the formula, we have:

10,000 Å = (0.529 Å) * n^2 / 1

Simplifying the equation:

n^2 = 10,000 Å / 0.529 Å

n^2 ≈ 18,913

To find the value of n, we take the square root of both sides:

n ≈ √18,913

n ≈ 137.43

Since the principal quantum number, n, must be a positive integer, we round it to the nearest whole number:

n ≈ 137

To determine the energy of the excited hydrogen atom in this orbit, we use the formula for the energy of the hydrogen atom in the Bohr model:

E = -13.6 eV / n^2

Plugging in the value of n:

E = -13.6 eV / (137^2)

E ≈ -13.6 eV / 18,769

E ≈ -7.25 × 10^-4 eV

The energy of the excited hydrogen atom in this orbit is approximately -7.25 × 10^-4 eV. The negative sign indicates that the electron is in an excited state with higher energy than the ground state.

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A.  Time taken for swing of a pendulum is 2.3 seconds per swing.

B. To find the time for one swing more accurately, the student can increase the number of swings, use a stopwatch with higher precision, minimize external disturbances, and repeat the experiment to calculate the average time.

The time taken for 20 swings of a pendulum is 46 seconds. To find the time for one swing, we need to divide the total time by the number of swings.

a. Time for one swing: 46 seconds / 20 swings = 2.3 seconds per swing.

To find the time for one swing more accurately, the student can employ the following techniques:

1. Increase the number of swings: By measuring the time for a larger number of swings, the student can reduce the impact of measurement errors and obtain a more precise average time. For example, measuring the time for 100 swings and then dividing by 100 would provide a more accurate estimate.

2. Use a stopwatch or timer with higher precision: Using a stopwatch or timer that provides more decimal places or higher precision can help capture smaller time intervals more accurately. This can reduce rounding errors and improve the accuracy of the measurement.

3. Minimize external disturbances: To ensure accurate timing, it is important to minimize external disturbances that may affect the pendulum's motion, such as air drafts or vibrations. Conducting the experiment in a controlled environment can help reduce these disturbances and enhance measurement accuracy.

4. Repeat the experiment: Performing the measurement multiple times and calculating the average time can help account for any inconsistencies or random errors in the measurements. This can lead to a more reliable and accurate estimate of the time for one swing.

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In the sky just above the Earth's axis are the south and north celestial poles.

The Southern Celestial Pole lies located precisely above the Southern Axis of the Earth, as you may already be aware. It is the location where the whole southern sky seems to revolve. Above Earth's northern and southern poles are the south and north celestial poles.

The two places in the sky where the axis of rotation of the Earth crosses the celestial sphere are known as the north and north celestial poles. Investigators at Humanity's North Pole the South Pole, respectively, see the northern and southern celestial poles as being straight overhead all the time.

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To calculate the change in gravitational potential energy of the rollercoaster from Position A to B, we need to consider the difference in height between the two positions.

The change in gravitational potential energy (ΔPE) is given by the formula:

ΔPE = m * g * Δh

where m is the mass of the rollercoaster, g is the acceleration due to gravity, and Δh is the change in height.

Given:

m = 120 kg

g = 9.8 m/s² (approximate value)

To calculate Δh, we need to find the difference in height between Position A and B:

Δh = 15 m - 32 m = -17 m

Since the rollercoaster is dropping in height, the change in height is negative.

Now we can calculate the change in gravitational potential energy:

ΔPE = 120 kg * 9.8 m/s² * (-17 m)

Simplifying the calculation:

ΔPE = -19896 J (rounded to the nearest whole number)

The change in gravitational potential energy of the rollercoaster from Position A to B is approximately -19896 Joules.

Note: The negative sign indicates a decrease in gravitational potential energy, as the rollercoaster is descending to a lower height.

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The force which counteracts the thrust force for the flight is known as the drag force, as it opposes the flow.

Drag is a force that opposes an object's relative motion to a fluid environment in the field of fluid dynamics. It may be among two liquid film (or surfaces) or in between a liquid and a flat wall. The drag force is influenced by velocity, as opposed to other resistive forces like dry contact, which are essentially independent of it.

When a flow is moving at low or high speed, the drag force is equal to the speed for low pressure and to the square of the velocity for high-speed flow. Although viscous friction is what ultimately causes drag, turbulent drag is unaffected by viscosity.

A force in physics is an input that has the power to change an object's motion. A mass-containing object's velocity can vary, or accelerate, as a result of a force. Intuitively, a push or a pull can also be used to describe forces.

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The drag force, which resists the flow, is the force that balances the propulsion force for flight.

In the study of fluid dynamics, drag is a force that opposes an object's relative motion to a fluid environment. It could be situated between two liquid surfaces (or films) or between a liquid and a flat wall.

Unlike other resistive forces like dry contact, which are largely independent of velocity, the drag force is affected by it.

For low pressure and high speed flows, respectively, the drag force is equal to the speed for low pressure and the square of the velocity. Although drag is ultimately caused by viscous friction, turbulent.

Thus, The drag force, which resists the flow, is the force that balances the propulsion force for flight.

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Explanation:

because conduction takes place in objects whose particles are close/touching each other therefore conduction happens in solid as liquid and gas paricles are not close to each other

Mass of cyclist = 100 kg

Mass of gorilla = 50 kg

Initial speed = 4.5 m/s

Let Final speed = s

100 x 4.5 = (100 + 50) x s

450 = 150s

S = 450/150

S = 3

The new speed is 3m/s

Dislocation is LEAST likely to be the cause of redness of the skin over a nontraumatized joint.

During a musculoskeletal exam, if you find redness of the skin over a nontraumatized joint, the LEAST likely cause among the options provided is dislocation. Dislocations typically result from trauma or injury, and since the joint in question is nontraumatized, it is less likely to be the cause compared to gout, arthritis, or rheumatic fever, which can all present with joint redness and inflammation without a history of trauma.Arthritis is a condition that results in inflammation of the joints, while gout is a type of arthritis caused by the buildup of uric acid crystals in the joint.

So the correct answer would be dislocation as it is least likely to be the cause of redness of the skin over a nontraumatized joint.

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Answer:

Fractional error = 0.17

Percent error = 17%

F = 112 ± 19 N

Explanation:

Plug in the values to find the force:

F = (3.5 kg) (20 m/s)² / (12.5 m) = 112 N

Find the fractional error:

ΔF/F = Δm/m + 2Δv/v + Δr/r

ΔF/F = 0.1/3.5 + 2(1/20) + 0.5/12.5

ΔF/F = 0.17

Multiply by 100% to find the percent error:

ΔF/F × 100% = 17%

Solve for the absolute error:

ΔF = 0.17 × 112 N = 19 N

Therefore, the force is:

F = 112 ± 19 N

The current in the circuit is Zero is true

Define current

An electrical charge carrier flow known as current often involves electrons or atoms lacking in electrons. negative to positive points are crossed by current.

The maximum voltage across the resistor is the first choice. This choice is incorrect because, after a considerable amount of time, the capacity is fully charged and the circuit's current "I" will be equal to zero. Moreover, because current is 0 It will now be equal to zero for the voltage courses resistive "IR."

The next option claims that the voltage across the capacitor is at its lowest. Additionally, this is incorrect because charge across a capacitor reaches its maximum over time. In addition to being maximum, voltage will be maximum and equivalent to charge upon capabilities.

No The capacitor is only partially charged, according to the next option. This is incorrect since it takes a while for the charge to reach its maximum level before the maximum current is claimed. . Which is also incorrect because once the capacitor is fully charged, current eventually zeroes out.

Since the capacitor's charge did not change at all after it reached full charge, the fact that the circuit's current is zero is accurate. Because the charge has achieved its maximum value, the rate of change of charge will be zero, and the current will also be zero.

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Answer:

25

Explanation:

By Using Pythagoras Theorem,

h^2=p^2+b^2

or, x^2=(24)^2+7^2

or, x^2=576+49

or, x^2=625

or, x=√625

•°• x=25

The value of x in this figure is 25.

What is Pythagorean theorem ?

Pythagorean theorem is applicable to only right angle tringle. it is defined as square of the hypotonias is equal to the square of sum of base and height.

i.e. hypotonias² = base² + height².

In this figure given values are,

Base = 7

Height = 24

hypotonias x = ?

according to Pythagorean theorem,

hypotonias² = base² + height²

hypotonias² = 7² + 24²

hypotonias² = 625

hypotonias = 25

Hence the value of x is 25.

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Answer: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.

Explanation: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.

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use Newton's gravitational law and 2nd law .....

The graph shown in the first option nicely plots the lion's and gazelle's velocities as a function of time, so option A is the correct answer.

Velocity is the rate of change of displacement over time.

As mentioned in the problem of running at a constant speed towards a gazelle with a standing lion as shown above.

So option A is correct.

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Answer:

C. tiny particles called charges flowing through the wires.

Explanation:

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.

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Answer:

c

Explanation:

electric current is tiny particles called charges flowing through the wires
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Answer:

 its not long dummy, its your imagination

Explanation: