if the distance moved by the effort is greater than the distance moved by the load, the machine is speed multiplier. TRUE/FALSE​

The acceleration of an object is directly related to the net force exerted upon it and inversely related to the mass of the object.

answer : directly , inversely

The area of contact between each tire and the ground is approximately 6.77 x 10⁻⁴ m².

To find the area of contact between each tire and the ground, we can use the formula for pressure:

Pressure = Force / Area

We are given the gauge pressure (6.80 x 10⁵ Pa) and the total weight of the rider plus the bike (830 N + 91 N = 921 N). Since the weight is supported equally by the two tires, the force on each tire is half the total weight:

Force on each tire = 921 N / 2 = 460.5 N

Now, we can rearrange the formula to find the area of contact:

Area = Force / Pressure

Substitute the values for force and pressure:

Area = 460.5 N / (6.80 x 10⁵ Pa)

Area ≈ 6.77 x 10⁻⁴ m²

So, between each tire and the ground, the area of contact is approximately 6.77 x 10⁻⁴ square meters.

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Answer: the air above a wildfire

Explanation:

First part of question is: The diagram shows currents that form as water is heated.

When water is being heated from below, convection currents are used. This happens when the molecules at the bottom are heated thus giving them energy and enabling them rise to the surface. The colder water at the surface will therefore sink to the bottom where is is heated making it rise as well and the process is repeated.

When a wildfire is ignited, the concept is the same. The air above the wildfire is the water in this scenario. It is heated at the bottom and rises thereby forcing the air above to come down and be heated as well. Both situations uses convectional currents.  

Answer:

The air above a wildfire

Explanation:

Answer:

The planets spun in epicycles.

Explanation:

The planets were not simply attached to a mystical sphere (“deferent”) but they were actually attached to a mini-sphere (“epicycle”) which rotated on the larger one.

Answer:A

Explanation:

The angular velocity of the coil is 125 radians/s.

We can use the following formula to find the angular velocity:

ε = NBAω

where

N = number of turns in the coil

B = magnetic field strength

A = area of the coil

ω = angular velocity

Let's rearrange the formula to get the value of ω.

ω = ε / NBA

The area of the coil can be calculated as:

A = l²

where l is the length of the side of the square coil.

The given length of the side of the coil is 15.0 cm. Converting it to meters, we get:

l = 0.15 m

Therefore,

A = (0.15 m)²

= 0.0225 m²

Now, let's substitute the values in the formula to get the value of ω.

ω = ε / NBA

= (30.0 × 10⁻³ V) / [(20)(0.050 T)(0.0225 m²)]

= 125 radians/s

Therefore, the angular velocity of the coil is 125 radians/s.

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Answer:

203 beats per minute

Explanation:

Answer:

203 beats per minute

Explanation:

220-17= 203

Hope this helps :)

Given that the direction sailboat is north and the distance traveled is d = 10 km

The direction of the wind is southeast and the force is

The sailboat travels the distance in time, t = 1 h

We have to find the work done by the wind and wind's power.

The diagram is shown below

The work done by the wind will be

The power of the wind will be

First I would ask

how much their budget is for one year. Next I would ask how they are going to have more clean energy. Other questions I would ask are where will you install the solar farms, will the farms impact local businesses and how much dirty energy they want to get out of the atmosphere

The amount of light that passes through the three Polaroid filters in order is 12.5%.

Does "light" imply "not heavy"?

Light is an adjective that describes something that isn't weighty, cumbersome, or depressing. A conversation topic or a music piece are both examples of things that can be considered light. The weight is light even though the trip is long, for instance.

Angle of transmission axis; θ = 45°

Formula for intensity of light from first polarizer is;

I₁ = ¹/₂I₀

Formula for intensity of light from second polarizer is;

I₂ = I₁cos²θ

Formula for intensity of light from third polarizer is;

I₃ = I₂cos²(90 - θ)

Combining the 3 equations;

Put ¹/₂I₀ for I₁ in second formula to get;

I₂ = ¹/₂I₀cos²θ

Put ¹/₂I₀cos²θ for I₂ in third formula to get;

I₃ = ¹/₂I₀cos²θ*cos²(90 - θ)

Plugging in 45° for θ gives;

I₃ = ¹/₂I₀cos²45*cos²(90 - 45)

⇒ I₃ = ¹/₂I₀cos²45*cos²45

⇒ I₃ = ¹/₂I₀cos⁴45

Now, cos 45 in surd form is 1/√2. Thus;

I₃ = ¹/₂I₀(1/√2)⁴

I₃ = ¹/₂I₀(¹/₄)

I₃ = ¹/₈I₀

I₃/I₀ = ¹/₈

I₃/I₀ = 0.125

In percentage form, we have;

I₃/I₀ = 12.5%

Therefore, the amount of light that passes through the three Polaroid filters in order is 12.5%.

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Answer:

[Ne] 3s² 3p¹

Explanation:

Answer: 1s2 2s2 2p6

Explanation:

The aluminum ground state would be 1s2 2s2 2p6 3s2 3p1.

However, the Aluminum Ion electron configuration would be 1s2 2s2 2p6 as it has LOST 3 electrons to have the noble gas configuration of Neon (Ne)

If the galvanic cell runs for 1 minute with a current of 0.25 ampere. Then 15 coulombs of charge would have been passed through the cell in that time.

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge.

I =Q/T

As given in the problem If the galvanic cell runs for 1 minute with a current of 0.25 ampere,

Charge = current ×time

             =0.25 ampere×60 seconds

             =15 couloms

Thus, 15 coulombs of charge would have been passed through the cell in that time.

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Answer:

Storm surge is the additional water, above the normal tidal ocean water, caused by the wind and low pressure of a hurricane. It is added to whatever the tide happens to be when the storm hits. If the storm hits at high tide then it’s X feet above the high tide. Tides fluctuates based upon the time of the year and the cycle of the moon.

Explanation:

Answer:

Storm surge is the additional water, above the normal tidal ocean water, caused by the wind and low pressure of a hurricane. It is added to whatever the tide happens to be when the storm hits. If the storm hits at high tide then it’s X feet above the high tide. Tides fluctuates based upon the time of the year and the cycle of the moon.

Explanation:

Answer:

3N to the right

Explanation:

(a) The instantaneous source voltage can be determined by using the given magnitude and phase angle. Since the phase angle is 0°, the instantaneous source voltage can be written as:

V(t) = 277 * cos(2π * 60 * t)

(b) For a 30-Ω resistor, the current entering the positive terminal is the same as the source current. Since the voltage and resistance are given, we can use Ohm's law to determine the current:

I(t) = V(t) / R = (277 * cos(2π * 60 * t)) / 30

(c) For a 15-mH inductor, the phasor current can be determined using the formula:

I = V / jωL

where j is the imaginary unit (√(-1)), ω is the angular frequency (2π * frequency), and L is the inductance. In this case, ω = 2π * 60 and L = 15 * 10^(-3):

I = (277 ∠0°) / (j * 2π * 60 * 15 * 10^(-3))

To find the instantaneous current, we can take the real part of the phasor current and then convert it to the time-domain using cosine function:

I(t) = Re(I * e^(jωt))

(d) For a capacitor with 100 mF, the phasor current can be determined using the formula:

I = jωCV

where C is the capacitance. In this case, ω = 2π * 60 and C = 100 * 10^(-3):

I = (j * 2π * 60 * 100 * 10^(-3)) * 277 ∠0°

To find the instantaneous current, we can take the imaginary part of the phasor current and then convert it to the time-domain using sine function:

I(t) = Im(I * e^(jωt))

The amount of energy lost due to external work done by air resistance/friction is 0.13515 kJ.

Before the body hits the earth, it has a kinetic energy of 9.8 joules. Solution, The conservation of energy causes the body's potential energy at height h to be transformed into kinetic energy during contact.

The baseball's combined potential and initial kinetic energies add up to its entire mechanical energy before it is dropped:

Ei = mgh + 0.5mv²

Plugging in the given values, we have:

Ei = (0.15 kg)(9.81 m/s²)(10.0 m) + 0.5(0.15 kg)(0 m/s)²

= 0.14715 kJ

The baseball's kinetic energy and final mechanical energy are equal before it strikes the ground:

Ef = 0.5mv²

where v denotes the baseball's final speed just before it strikes the ground.

By plugging in the specified kinetic energy number, we obtain:

Ef = 0.5mv² = 12.0 J

Solving for v, we have:

v = sqrt(2Ef/m) = sqrt(2(12.0 J)/(0.15 kg)) = 7.75 m/s

Utilizing the work-energy concept, we can determine the work generated by air resistance and friction.

W = Ef - Ei = 12.0 J - 0.14715 kJ

= -0.13515 kJ

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Costs and benefits that should be ignored when making decisions are called Irrelevant costs and benefits.

The costs and benefits that should be ignored when making decisions are called "sunk" costs and benefits. Sunk costs refer to the resources or expenses that have already been incurred and cannot be recovered or changed, regardless of the decision made. These costs should be disregarded because they are irrelevant to the current decision-making process.

Ignoring sunk costs allows individuals or organizations to focus on future costs and benefits that can be influenced by their choices, enabling more rational and objective decision-making. By recognizing sunk costs and treating them as irrelevant, decision-makers can avoid being influenced by past investments or emotional attachments and instead concentrate on the potential outcomes of their choices.

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Scientists are confident that they have succeeded in making a detection when they have observed a signal that is consistent with the predicted characteristics of the phenomenon they are trying to observe.

When this signal is statistically significant, meaning that it is unlikely to have occurred by chance. For example, in the case of gravitational wave detection, scientists use highly sensitive detectors, such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) to measure minuscule distortions in space-time caused by passing gravitational waves.

When the data from the detectors is analyzed, scientists look for signals that match the predicted waveform of a gravitational wave. They also use statistical methods to determine the probability that the observed signal is not just random noise.

If the observed signal matches the predicted waveform and has a low probability of occurring by chance, scientists can be confident that they have made a detection. However, it is important to note that these detections are often very difficult to make and require a high level of precision and accuracy in both the instruments and the analysis techniques used.

Therefore, scientists also subject their findings to rigorous peer review and validation by independent researchers to confirm the validity of their results.

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Answer:

I. Angle = 41.7° Northeast.

II. Vr = 7.08m/s

Explanation:

Let the two cars be denoted by A and B

Given the following data;

Mass of car A = 1232 Kg

Velocity of car A = 25.6 m/s

Mass of car B = 2028 Kg

Velocity of car B = 17.5m/s

First of all, we would solve for momentum;

Momentum = mass × velocity

Momentum, M1 = 1232 × 25.6

Momentum, M1 = 31539.2 Kgm/s

Momentum, M2 = 2028 × 17.5

Momentum, M2 = 35490 Kgm/s

Now, let's find the resultant momentum using the Pythagoras theorem;

R² = M1² + M2²

R² = 31539.2² + 35490²

R² = 994721136.6 + 1259540100

R² = 2254261237

Taking the square root of both sides, we have

Resultant momentum, R = 47479.06 Kgm/s

To find the direction;

Angle = tan¯¹(M1/M2)

Angle = tan¯¹(31539.2/35490)

Angle = tan¯¹(0.89)

Angle = 41.7° Northeast.

To find the speed;

R = (M1 + M2)Vr

47479.06 = (31539.2 + 35490)Vr

47479.06 = 67029.2Vr

Vr = 47479.06/67029.2

Vr = 7.08m/s

Answer:

2.5 km because displacement is xf -xi

xf = 2.5

xi= 0

2.5 - 0 =2.5 km

On a wall 1.47 m away from the grating, the central and first-order principal maxima are separated by 0.562 m. The laser light's wavelength is 674 nm.

The principal maxima are defined by dsinθ=mλ, where m=0,1,2,…

For m=1,λ=dsinθ

The angle between the central maximum (m=0) and the first order maxima (m=1) in this case is called. The value of can be calculated using the data provided on the separation between maxima and the grating-to-screen distance:

tanθ= 0.562/1.47m =0.382

So θ=22.457°

 and sinθ=0.382

The distance between grating "slits" equals the reciprocal of the number of grating lines per centimeter

d= 1/5660 cm⁻¹ = 0.0001766784=1.766*10³ nm

The wavelength is λ=dsinθ=(1.766*10³nm)(0.382)=674nm

A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically expressed in metres (m), centimeters (cm), or millimeters (mm) (mm). It is more common to specify the wavelength in nanometers (nm), which are units of 10-9 m, or angstroms (), which are units of 10-10 m, for infrared (IR), visible light (VL), ultraviolet (UV), and gamma radiation ().

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Answer:

True

Explanation:

Velocity is a vector quantity, which means that it carries both magnitude and direction. Hence when direction of a particle changes, although magnitude (speed) may remain same, it's velocity changes due to direction change. For ex. A particle is m... A particle is moving along x axis with speed 1m/s, it's velocity will be represented as 1i (i represents unit vector along x)

But if it now starts moving along y axis, it's velocity is 1j (j represents unit vector along y axis). Hence velocity changes with direction.

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Answer:

The gravitational potential energy (G.P.E) of the ceiling fan is 712.95 Joules.

Given the following data:

Scientific data:

To calculate the gravitational potential energy (G.P.E) of the ceiling fan:

Gravitational potential energy (G.P.E) can be defined as the energy that is possessed by an object or body due to its position (height) above planet Earth.

Mathematically, gravitational potential energy (G.P.E) is given by this formula;

\(GPE = mgh\)

Where:

Substituting the given parameters into the formula, we have;

\(GPE = 7.5 \times 9.8 \times 9.7\)

GPE = 712.95 Joules.

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Answer: D. plant more trees where forests are cut down.

Explanation:

Deforestation has to do with the cutting down of trees. Cutting down the forest reduces the size of animal habitats, increases erosion, and results in an increase in the amount of carbon dioxide in the atmosphere.

Ok order to tackle the above, it is necessary that we should plant more trees where forests are cut down.

Time = (distance) / (speed)

Time = (450 km) / (100 m/s)

Time = (450,000 m) / (100 m/s)

Time = 4500 seconds (that's 75 minutes)

Note:

This is about HALF the speed of the passenger jet you fly in when you go to visit Grandma for Christmas.

If the International Space Station flew at this speed, it would immediately go ker-PLUNK into the ocean.

The speed of the International Space Station in its orbit is more like 3,100 m/s, not 100 m/s.

The magnitude of the larger of the two individual forces. is 120.5N.

Solution:

x + y = 343

x - y = 177

2x = 520

x = 222.5 N

y = 343 N - 222.5 N = 120.5N.

The resultant force of two forces of equal magnitude is equal to one of the two vectors. In physics, the magnitude of a force is the sum of all forces acting on an object. If all forces act in the same direction, the force magnitude increases. When forces act on an object in different directions, the force magnitude decreases. If one force is stronger than the other, the force will move to the smaller side but the acceleration will be slower. So the result is the difference between the two forces.

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