There is said to be a short circuit when

A. one part of a closed circuit has a very low resistance and almost all the current will flow through this part and very little current will flow through the other part.

B. one part of a parallel circuit has a very low resistance and almost all the current will flow through this part and very little current will flow through the other part.

C. one part of a parallel circuit has a very low resistance and very little of the current will flow through this part and almost all the current will flow through the other part.

D. one part of a closed circuit has a very low resistance and very little of the current will flow through this part and almost all the current will flow through the other part.

Magnitude and direction of the acceleration is 2.5 m/s² (Toward west)

Given that;

Initial speed of car = 2 m/s

Final speed of car = 12 m/s

Time taken = 4 second

Find:

Magnitude and direction of the acceleration

Computation:

Acceleration = [v - u] / t

Magnitude and direction of the acceleration = [12 - 2] / 4

Magnitude and direction of the acceleration = 10 / 4

Magnitude and direction of the acceleration = 2.5 m/s² (Toward west)

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Explanation:

Making it three times longer will cause the resistance to increase by a factor of three to  6 Ω    ....then halving the area will DOUBLE it to 12 Ω

It would take 173 calories of heat (energy) to heat 13.0 g of water from 29.0 °C to 53.0 °C.

The amount of heat needed to raise the temperature of a substance can be calculated using the formula:

Q = m * c * ΔT

where Q is the amount of heat energy (in calories), m is the mass of the substance (in grams), c is the specific heat capacity of the substance (in calories per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).

For water, the specific heat capacity is 1 calorie per gram per degree Celsius. So, for this problem:

m = 13.0 g
c = 1 cal/g°C
ΔT = 53.0 °C - 29.0 °C = 24.0 °C

Plugging these values into the formula gives:

Q = 13.0 g * 1 cal/g°C * 24.0 °C = 312 calories

However, this formula only gives us the amount of heat needed to raise the temperature of the water from 29.0 °C to 53.0 °C. We need to subtract the amount of heat needed to raise the temperature of the water from its initial temperature of 29.0 °C to the temperature at which it starts to warm up, which is 0 °C. This is because water has a specific heat capacity that changes at the phase change temperature of 0 °C. The heat needed to raise the temperature of water from 0 °C to 100 °C is different from the heat needed to raise the temperature of water from 100 °C to 373.15 °C (the boiling point of water).

The amount of heat needed to raise the temperature of 13.0 g of water from 29.0 °C to 0 °C can be calculated using the same formula:

Q = m * c * ΔT
m = 13.0 g
c = 1 cal/g°C
ΔT = 0 °C - 29.0 °C = -29.0 °C

The negative sign indicates that this amount of heat is released by the water as it cools down from 29.0 °C to 0 °C.

Adding the amount of heat needed to warm the water from 0 °C to 53.0 °C to the amount of heat released by the water as it cools down from 29.0 °C to 0 °C gives:

Q = 312 calories + (-377 calories) = -65 calories

This means that 65 calories of heat are released by the water as it cools down from 29.0 °C to 0 °C and then 173 calories of heat are needed to warm the water from 0 °C to 53.0 °C. Therefore, the total amount of heat needed to heat 13.0 g of water from 29.0 °C to 53.0 °C is:

173 calories - 65 calories = 108 calories

So, it would take 108 calories of heat (energy) to heat 13.0 g of water from 29.0 °C to 53.0 °C.

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Astronomers believe that the Jovian planets (Jupiter, Saturn, Uranus, and Neptune) must contain rocky material in their cores due to their overall composition and formation.

These gas giants have large masses and gravitational fields, which indicate the presence of substantial solid material. The core is thought to have formed from the accumulation of heavier elements such as rocks, metals, and ices during the early stages of planetary formation.

Additionally, measurements of the planets' densities and interior models support the presence of a rocky core, providing evidence for the existence of solid material at their centers.

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Answer:

On molecules of PH3, there has to be 3 atoms.

Explanation:

The Element Hydrogen (H) has 3 attoms.

The Element Phosphorus (P) has 1 atom.

These two created into the molecule PH3, would have to have only 3 attoms because they are asking how many hydrogens atoms are in the molecule PH3.    

Answer:

The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.

As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.

Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both  phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.

The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.

The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.

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When a 9-volt battery is connected across a light bulb, the electrical energy supplied by the battery is dissipated by the light bulb in the form of light and heat.

As the battery provides a potential difference across the circuit, the electric current flows through the filament of the light bulb. The filament is usually made of tungsten and it has high resistance, which causes it to heat up rapidly. The high temperature of the filament causes it to emit light, which is the main purpose of the light bulb.

However, some of the electrical energy is also converted into heat energy due to the resistance of the filament. This heat energy is radiated from the filament and also heats up the surrounding air. Therefore, the electrical energy supplied by the battery is dissipated by the light bulb in the form of light and heat energy.

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Explanation:

The amount of POTENTIAL energy (mgh)  is converted entirely to KINETIC energy ( 1/2 mv^2)   at instant before impact

mgh   = 1/2 mv^2

gh = 1/2 v^2

2 gh = v^2

v = sqrt ( 2 g h) = sqrt (  2 * 9.81 * 4.5) = 9.4 m/s

Momentum = m * v  =  .05 kg * 9.4 m/s  = .47  kg m/s

(a) Fundamental frequency of clothesline is 6.98Hz.

(b) Frequency of second harmonic is 13.98Hz.

The wave velocity expression is,

        v = √T / √μ

here, T is tension μ is mass per unit length

     v = √22.1 / √(12.5×10⁻³/7.66)

     v = 116.37 m/s

    For the fundamental frequency,

                  v = fλ

     116.37 m/s= 7.6 ×λ

         λ = 15.31 m

     For the second Harmonic,

          λ₂=  v/ f₂ = 116.37 / 15.2 = 7.66 m

     Now consider mass is increased

             μ= 14.8 × 10⁻³ / 7.66

                v = √T / √μ

                v = √22.1 / √14.80 × 10⁻³/7.66

                v = 106.95 m/s

          Fundamental harmonic,

                f₁ = v/λ₁ = 106.95 / 15.31 = 6.98 Hz

                f₂= v/ λ₂ = 106.95 / 7.65 = 13.98 Hz

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[Your question is incomplete, but most probably your full question was-

a) What is the frequency of the fundamental harmonic for a clothesline with a mass of 14.8 g?

(b) What is the frequency of the second harmonic for a clothesline with a mass of 14.8 g?]

Exposure time used with camera B in photographing is 3.93 × 10⁻³s.

Exposure time, is commonly understood to mean the amount of time the film in a traditional camera or the sensor in a modern digital camera is actually exposed to light to capture an image. Exposure times are given in seconds.

Exposure time = focal length/aperture area

For the first lens:

T₁ = F₁/πR₁²

F₁ = T₁ × πR₁²

For the second lens:

T₂ = F₂/πR₂²

F₂ = T₂ × πR₂²

Since, F₁ = F₂ [Given]

So,

T₁ × πR₁² = T₂ × πR₂²

T₂ = (T₁ × R₁²)/R₂²

Where, T₁ = exposure time of camera A

T₂ = exposure time of camera B

R₁ = aperture radius of lens for camera A

R₂ = aperture radius of lens for camera B

T₂ = (3.33 × 10⁻² × 3.9²)/11.35²

T₂ = 3.93 × 10⁻³s

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Complete question is as follows:

Camera A has a lens with an aperture of 7.80 mm. It photographs an object using the correct exposure time of 3.33 × 10⁻²s. What exposure time should be used with camera b in photographing the same object with the same film if this camera has a lens with an aperture diameter of 22.7 mm ? the lenses of cameras a and b have the same focal length.

Answer:

135.3 cm + 93.46cm

= 228.76 cm

So total length of two fish is 228.76

The given statement, "Large particles sink faster than small particles of the same density" is true.

What is meant by sinking speed?

The sinking speed is the rate at which a particle sinks in water, and it is proportional to the particle's size and shape as well as its weight per volume unit. The density of a particle, the density of the surrounding fluid, and the particle's shape are all factors that influence its sinking rate. If a particle is denser than the fluid surrounding it, it will sink. If the particle is less dense than the fluid, it will float.

In general, the sinking speed of an object can be influenced by buoyancy forces and drag forces. Buoyancy force acts in the opposite direction to the sinking motion and is determined by the density of the object and the fluid it is in. If the object is denser than the surrounding fluid, it will sink. Drag force, on the other hand, acts to slow down the sinking motion and is influenced by the object's shape and size as well as the viscosity of the fluid.

The sinking speed can vary widely depending on the specific circumstances. For example, a small and dense object like a pebble will sink relatively quickly in water due to its high density and streamlined shape. Conversely, a larger and less dense object like a beach ball will sink more slowly or even float due to its lower density and larger surface area.

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There are 16,170 turns in the secondary coil of the transformer. To find the number of turns in the secondary coil of a transformer designed to change 115V into 13,500V with 138 turns in the primary coil and 100% efficiency, we can use the formula:

Vp/Vs = Np/Ns

Where Vp is the voltage in the primary coil, Vs is the voltage in the secondary coil, Np is the number of turns in the primary coil, and Ns is the number of turns in the secondary coil.

Plugging in the values, we get:

115/13,500 = 138/Ns

Solving for Ns, we get:

Ns = (138 x 13,500) / 115

Ns = 16,170

In summary, the number of turns in the secondary coil of a transformer is determined by the ratio of the voltage in the primary coil to the voltage in the secondary coil, assuming 100% efficiency.

By knowing the number of turns in the primary coil and the desired voltage transformation, we can calculate the number of turns in the secondary coil using the formula Vp/Vs = Np/Ns.

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If a neutral material like fur is rubbed on another neutral object like a rubber ball then the balloon becomes negatively charged and the fur becomes positively charged. The correct option is A.

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.

When the positive and negative charges are out of balance, static electricity is produced.

While electrons like to hop all over the place, protons and neutrons don't move around very much. A negative charge is present when an object (or person) possesses more electrons.

The animal fur lacks electrons while the rubber balloon has an abundance of them.

The rubber balloon has an overabundance of negative charge due to its extra electrons. The absence of electrons on animal fur also gives it a positive charge.

Thus, the correct option is A.

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The sign of the estimate of the area under the curve using left or right endpoints cannot be determined if f is not known to be increasing or decreasing on [a, b].

1. Using left endpoints would give an overestimate of the area under the curve on this interval.

2. Using right endpoints would give an underestimate of the area under the curve on this interval.

3. Using right endpoints would give an overestimate of the area under the curve on this interval.

4. Using left endpoints would give an underestimate of the area under the curve on this interval.

5. If f is not known to be increasing or decreasing on [a, b], it is not possible to determine the sign of the estimate of the area under the curve using left or right endpoints.

Suppose f is increasing on the interval [a, b] and we want to estimate the area under the curve on this interval. When using the left-hand endpoint, the rectangles will be above the curve if the curve is concave down, which will overestimate the area. When using the right-hand endpoint, the rectangles will be below the curve if the curve is concave down, which will underestimate the area. When using the left-hand endpoint, the rectangles will be below the curve if the curve is concave up, which will underestimate the area. When using the right-hand endpoint, the rectangles will be above the curve if the curve is concave up, which will overestimate the area.

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The refractive index of the eye cannot be determined with the information provided.

This refers to the value obtained from the ratio of the speed of light in a vacuum to that in a second medium of greater density.

The refractive index is also equivalent to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance.

It can be calculated using the formula:

n = c/v.

where,

n = the refractive index of the eye

c = wavelength in empty space

v = the  velocity of light

From the question:

r = 0.78 cm

i = 3 cm

The radius of curvature and the location of the image formed by an object at infinity is related to the eye's optics, but the refractive index also depends on the materials of the various parts of the eye, such as the cornea and lens.

Hence, the refractive index can also vary depending on the specific wavelength of light being considered.

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Answer:

False

Explanation:

The formula of force that exists between two charges is expressed as;

F = kq1q2/r²

If two charges separated by one meter exert a 9 N force on each other, the;

9 = kq1q2/1²

9 = kq1q2 ..... 1

If the charges are pushed to a 3 meter separation, then;

F =  kq1q2/3²

F =  kq1q2/9 .... 2

Divide both equations;

9/F = (kq1q2)/ kq1q2/9

9/F =  kq1q2 * 9/ kq1q2

9/F = 9

F = 9/9

F = 1N

Hence if the charges are pushed to a 3 meter separation, then the force on EACH charge will be 1N. Hence the answer is False

Answer:

26.946cm³

Explanation:

d=m/v

d=45g/1.67g/cm³

d=26.946cm³

The centripetal acceleration is (a) 0.30 m/s² .

The rate at which an object's velocity with respect to time changes is referred to as acceleration. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force acting on an object determines the direction of its acceleration.

We are given that,

Speed = V = 11m/s

Radius = r = 36.5 m

To calculated the centripetal acceleration can be calculated by the formula,

a = V/r

a = (11m/s)/36.5m

a = 0.3013m/s²

The centripetal acceleration of Olympic track would be 0.3013m/s².

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It accelerates at about 32 feet per second every second, so it starts falling at zero feet per second and, one second later it is traveling at 32 feet per second. That means that its average speed is 16 feet per second, so it will fall 16 feet in the first second.

We will have the following:

First, we determine the time it takes for the motorcycle to traverse the 40 m:

Now, we will use the time to determine the height of the ramp:

So, the ramp was located 0.784 meters in height.

Answer:steel plate

Explanation: bc I said so

The maximum speed while rocking back and forth on the rocking horse is approximately 15.041 m/s.

In simple harmonic motion, the maximum speed is reached at the amplitude of the motion. Therefore, to find the maximum speed, we can use the formula:

Maximum speed = Amplitude × Angular frequency

The angular frequency (ω) can be calculated using the formula:

Angular frequency (ω) = 2π / Period

Given that the amplitude is 9.384 meters and the period is 3.91 seconds, we can calculate the maximum speed as follows:

Angular frequency (ω) = 2π / 3.91 s ≈ 1.605 rad/s

Maximum speed = 9.384 m × 1.605 rad/s ≈ 15.041 m/s

Therefore, The maximum speed while rocking back and forth on the rocking horse is approximately 15.041 m/s.

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Answer:

the power developed by the automobile is 7,764.57 W.

Explanation:

Given;

mass of the automobile, m = 2500 kg

initial power developed by the automobile, P₁ = 30 kW = 30,000 W

initial speed of the automobile, v₁ = 90 km/h = 25 m/s

inclination of the hill, θ = 15⁰

second speed of the automobile, v₂ = v₁Sinθ

The power developed by the automobile is calculated as;

P = Fv

\(F = \frac{P_1}{V_1} = \frac{P_2}{V_2} \\\\P_2 = \frac{P_1V_2}{V_1} \\\\P_2 = \frac{30,000 \ W \ \times 25Sin(15^0)}{25} \\\\P_2 = 30,000 \ \times sin(15^0)\\\\P_2 = 7,764.57 \ W\\\\\)

Therefore, the power developed by the automobile is 7,764.57 W.

In the actual world, there are five primary types of interactions between light and matter. These are emission, scattering, reflection, absorption, and transmission.

Maxwell's equations, which regard the solid as a continuum and result in its optical characteristics as a measure of the frequency of the electromagnetic energy: the complex dielectric constant, are used to explain the interaction of light with solids.

As light enters a material, transmission happens. As light moves across a medium, it may do so without being distorted or dispersed by the medium. When light transmits its energy to matter instead of being reflected nor transmitted by it, this is known as absorption of light.

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According to Ohm's Law, the total current flowing through a circuit with a resistance of 1200 ohms and a 12 V power supply is equal to 0.01 ampere.

Electric current is inversely correlated with resistance according to Ohm's Law and proportionate to voltage. 'The law can be expressed mathematically as V = IR, in which 'V' is the voltage variation 'I' is the flowing current in amps, & the resistance (R) in ohm.

Given data :

Resistance = 1200 ohm

power supply = 12 V

By using Ohm's law

V = I × R

I = V / R

I = 12 / 1200

I = 0.01 ampere.

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A strong magnetic field prevented the creation of charged particles or ions.

This is because the magnetic field exerts a force on charged particles, causing them to move in a circular path around the field lines, which in turn prevents them from combining and forming new particles or ions.

A strong magnetic field can have various effects on the physical and chemical processes occurring within a system, and can sometimes prevent the creation or modification of certain materials or structures.

One example of this is in the field of material science and engineering, where magnetic fields can be used to control the growth and alignment of crystalline structures in materials.

In some cases, a strong magnetic field can prevent the creation of certain materials altogether.

For example, when attempting to produce graphene using chemical vapor deposition (CVD), a strong magnetic field can disrupt the growth process and prevent the formation of the desired structure.

This is because the magnetic field can affect the movement and orientation of the precursor molecules, leading to a non-uniform growth pattern and the formation of defects in the graphene lattice.

Similarly, in certain chemical reactions, a strong magnetic field can alter the rate and outcome of the reaction, making it difficult or impossible to create certain products.

This is because the magnetic field can affect the spin states of the reacting molecules and alter their reactivity and selectivity.

Overall, a strong magnetic field can have significant and sometimes unpredictable effects on the creation and modification of materials and chemicals, and must be carefully considered and controlled in many research and industrial processes.

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Answer:

\(Distance = 2.4\ km\)

Explanation:

Given

\(Time (t) = 6.8s\)

\(Temperature = 28C\)

Required

Determine the distance at which the lighting struck

First, we need to determine the speed at which the lighting struck because the peed of sound varies with temperature.

At about 28C, the speed of sound is 346m/s

So, we have the following:

\(Speed = 346m/s\)

\(Time = 6.8s\)

Distance is calculated as thus:

\(Distance = Speed * Time\)

\(Distance = 346m/s * 6.8s\)

\(Distance = 2352.8\)

Divide by 1000 to get distance equivalent in kilometers

\(Distance = \frac{2352.8km}{1000}\)

\(Distance = 2.3528km\)

\(Distance = 2.4\ km\) ---- Approximated

At the pectoral girdle, the lateral end of the  clavicles joins with the shoulder  girdle of the scapula.

The clavicles (collarbones) and scapulae make up the shoulder girdle, often known as the pectoral region (shoulder blades). Human clavicles connect the sternum (breastbone) medially and the scapulae laterally. Only muscles connect the scapulae to the trunk, though.

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