A length of wire is connected to a 9.0 V power pack and an ammeter. The reading on the ammeter is 0.25 A.
Calculate the resistance of the wire. Give the unit.

Drag is ignored in projectile predictions because projectiles usually have a relatively short time of flight.

The surface area of the object, the wind speed, as well as the relative velocity of the airplane will affect the drop of relief packages.

The drag force will cause the projectile to take a longer time to land and may cause to land far from its expected drop point.

Drag is a force that acts in opposition to the motion of an object moving through a fluid.

Drag can be thought of as friction in fluids because similar to friction, it acts in an opposite direction of the relative motion of a moving object.

For example, airplanes moving through air experience a drag; ships and boats moving through water experience drag too.

Drag also occurs in projectiles moving through the air. However, because of the relatively short time of flight, it is usually ignored in projectile motion.

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Complete question:

While studying projectile motion, we consider ideal scenarios, where the projectile travels along its trajectory only under the influence of gravity. In real-world situations, however, other forces act on the projectile.

Consider a cargo plane that is dropping relief packages to flood victims. In predicting and studying this motion, we might consider gravity, but ignore the horizontal and vertical forces associated with drag (or air friction). Discuss this simplification. Specifically address these questions:

•Why do we often ignore drag in projectile predictions?

•What conditions (of the object, its surroundings, and its launch) do you think might make drag a significant factor in the relief package drop?

•How would drag affect the projectile's motion if it really were a significant factor in the relief package drop?

The constant acceleration of the train is 0.33 m/s.

The average velocity can be calculated by using the formula:

velocity = distance/time

For the 1st car, the velocity is calculated as:

v₁ = 8.60 m / 1.80 s = 4.78 m / s

For the second car, velocity can be calculated as:

v₂ = 8.60 m / 1.66 s = 5.34 m / s

Now we can solve for the acceleration using the formula:

v₂² = v₁² + 2 a d

Rewriting in terms of a, we get

a = (v₂² – v₁²) / 2 d

a = (5.34)² – (4.78)² / (2 × 8.6)

a = 0.33 m/s

Therefore, the constant acceleration of the train is 0.33m/s.

what is acceleration explain?

acceleration, fee at which speed modifications with time, in terms of each pace and course. A factor or an object shifting in a directly line is improved if it hastens or slows down. motion on a circle is improved even if the velocity is steady, due to the fact the route is constantly converting

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We have the next diagram

First we need to obtain the force in the x-axis

where F=100 and θ=40°

And the use the next formula for work

where F is the force, d is the distance and W is the work

in our case F=Fx and d=10

the work he did is 766 J

Answer:

Question 4 is actually Acceleration

Answer:potato cube is a more than a cube

Explanation:

petri dish is always better

In order to calculate the object's mass, we can use the formula for the weight:

Using the gravity acceleration equal to 9.8 m/s², we have:

Answer:    

2 : A large storm

Explanation: I hope this helps

Answer:

B. Myron increased the friction by increasing speed.

Explanation:

i got it correct on edge

Answer:

The answer is B i think

Explanation:

Value of M (mass of other block) in the mention pulley system is 3.68 kg.

Tension is the contact force transmitted when the force on both ends pulls on a rope, cord, wire, etc.

For example, a tire swing hanging from a tree creates tension in the rope that holds the swing to the branch. Pulling at the bottom of the rope is due to gravity, while pulling up is due to the branches resisting rope pull. The pulling force acts along the length of the rope and acts evenly on the objects (tires and branches) at both ends. At the hoop, the pull is upward (because the tension in the rope holds the hoop up), but at the branch the pull is downward (a taut rope pulls the branch down).

Let's calculate acceleration:

S = ut + ¹/₂ at²

Where, s = 50 cm or 0.5 m

u = 0 m/s

t = 1.0 second

Now, substitute the values:

0.5 = 0 × 1 + ¹/₂ a × 1²

0.5 = ¹/₂ a

a = 1 m/s²

Now for tension force following are the equations:

T = ma + mg

T = Mg - Ma

ma + mg = Mg - Ma

Where, T = Tension force

m = 3 kg

a = 1 m/s²

g = 9.8 m/s²

M = To be calculated

a = (Mg - mg)/(M + m)

1 = (M × 9.8 - 3 × 9.8)/(M + 3)

1(M + 3) = 9.8 M - 29.4

M + 3 = 9.8 M - 29.4

29.4 + 3 = 9.8 M - M

32.4 = 8.8 M

M = 32.4/8.8

M = 3.68 kg

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The complete question is as follows:

The system shown below is released from rest and moves 50 cm in 1.0 second. What is the value of M? All surfaces are frictionless.

The rotational velocity of the centrifuge is \(\sqrt{5}\) rad/s.

Centripetal force is defined as the force that acts on a body moving in circular path which is directed towards the centre of the circular path.

Here,

The rotational acceleration attained by the astronauts, a' = 100 m/s²

The radius of the centrifuge, r = 20 m

From the equation of circular motion,

       a' = rω²

So,  ω² = a'/r

      ω² = 100/20

      ω² = 5

Rotational velocity, ω = \(\sqrt{5}\) rad/s

Hence,

The rotational velocity of the centrifuge, ω is \(\sqrt{5}\) rad/s

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Answer:

A

Explanation:

Answer: a or e

Explanation:

Answer:

the tension in the cable is \(\mathbf{F = \frac{\pi E_o v^2r^2}{2d^2}}\)

the work done by the cable is \(\mathbf{W= \frac{\pi E_ov^2r^2}{4d}}\)

Explanation:

A)

If we have two circular plate supported by a cable at a fixed distance, then the electric field formed between the two plate of the capacitor can be represented by the equation.

\(\mathbf{E = \frac{voltage \ \ V}{distance \ \ d}}\)

However; the net electric field i.e the sum of the electric filed produced is represented as:

\(\mathbf{E' = \frac{E}{2}} \\ \\ \mathbf{E' = \frac{V}{2d}}\)

So, if we assume that the lower plate and the upper plate possess the charge +q and -q respectively. Then, the tension of the cable which is the same as Force F can be written as:

\(\mathbf{F = q* E'}\)

\(\mathbf{F = \frac{q*v}{2d}}\) -----    equation (1)

Also ; we know that

\(\mathbf{C = \frac{q}{v}= \frac{E_oA}{d}}\)

\(\mathbf{\frac{q}{v}= \frac{E_o \pi r^2}{d}} \ \ \ \ \ \mathbf{since \ A = \pi r^2}\)

\(\mathbf{{q}= \frac{\pi E_o {v} r^2}{d}}\)    -----   equation (2)

Replacing equation 3 into equation (2); we have:

\(\mathbf{F = \frac{\pi E_o vr^2}{d}* \frac{v}{2d}}\)

\(\mathbf{F = \frac{\pi E_o v^2r^2}{2d^2}}\)

Therefore,  the tension in the cable is \(\mathbf{F = \frac{\pi E_o v^2r^2}{2d^2}}\)

B)

Assume that the upper plate is displaced by dz in an upward direction ; Then we can express the workdone by the tension as :

\(\mathbf{dW = T *dz} \\ \\ \mathbf{dW = F*dz} \\ \\ \mathbf{dW = \frac{\pi E_o v^2r^2}{2z^2}dz }\)

The net workdone to raise the plate from separation d to 2d is:

\(\mathbf{W = \int\limits^{2d}_{2zd} {dw} = \frac{\pi E_ov^2r^2}{2} \int\limits^{2d}_d \frac{dz}{z^2} }\)

\(\mathbf{W= \frac{\pi E_ov^2r^2}{2} [-\frac{1}{z}]^{2d}_d }\)

\(\mathbf{W= - \frac{\pi E_ov^2r^2}{2} [\frac{1}{2d}-\frac{1}{d}]}\)

\(\mathbf{W= - \frac{\pi E_ov^2r^2}{2} [\frac{-1}{2d}]}\)

\(\mathbf{W= \frac{\pi E_ov^2r^2}{4d}}\)

the work done by the cable is \(\mathbf{W= \frac{\pi E_ov^2r^2}{4d}}\)

C) To calculate the energy stored in the Electrical energy Capacitor before the top plate is raised ; we have:

\(\mathbf{U_i = \frac{1}{2}Cv^2} \\ \\ \mathbf{U_i = \frac{1}{2}(\frac{E_oA}{d})v^2} \\ \\ \mathbf{U_i = \frac{1}{2}(\frac{E_o \pi r^2}{d})v^2} \\ \\ \mathbf{U_i = \frac{E_o \pi r^2 v^2}{2d}} }\)

D) The energy stored in the plate after the  the top plate was raised is as follows:  

\(\mathbf{U_f = \frac{1}{2}C'v^2} \\ \\ \mathbf{U_f = \frac{1}{2}(\frac{E_oA}{2d})v^2} \\ \\ \mathbf{U_f = \frac{1}{2}(\frac{E_o \pi r^2}{2d})v^2} \\ \\ \mathbf{U_f = \frac{E_o \pi r^2 v^2}{4d}} }\)

E) Yes,  work done by the cable equal to the change in the stored electrical energy. The Difference in energy stored before and after the top plate is raised:

\(\mathbf{U_i-U_f} = \mathbf{\frac{E_o \pi r^2 v^2}{2d}} }} - \mathbf {\frac{E_o \pi r^2 v^2}{4d}} }}\)

\(\mathbf{U_i-U_f}= \mathbf {\frac{E_o \pi r^2 v^2}{4d}} }}\)

Thus;

b)The work done in separating the plates is equal to the magnitude of the energy change in the plates. This does not mean that the work done is equal to the change in the energy stored in the plates.

Answer: 7

Explanation: 7 is the superior number

Answer:

1,269 N

Explanation:

I guessed and got the question right on CK-12's work practice.

The temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

Using the ideal gas law, we can write: PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature. Since the mass of air is not changing, we can write: PV = constant.

Applying this to the situation where the air mass rises to a level where the pressure is 8.70×10⁴ Pa, we get:

Dividing the second equation by the first and using the fact that γ=Cp/Cv=1.40 for air, we get:

Solving for T2, we get:

Thus, the temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

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Answer: geothermal

Explanation:

The geothermal energy source has no greenhouse gas emissions or health impacts on humans.

Geothermal energy can be described as the thermal energy in the Earth's crust which arises from the formation of the planet and from the radioactive decay of materials.

The high temperature in Earth's interior cause rock to melt and solid mantle to behave plastically. The mantle convects upward since it is lighter than the surrounding rock. Temperatures at the core-mantle boundary reach over 4000 °C.

Geothermal heating can use water from hot springs and geothermal power means the generation of electricity from geothermal energy, which has gained importance.

Earth's geothermal resources are more than adequate to supply humanity's energy needs, although a small fraction is currently being profitably exploited, commonly in areas near tectonic plate boundaries.

The greenhouse gas emissions of geothermal stations are on average 45 g of CO₂ per kWh of electricity or less than 5% of that of conventional coal-fired plants.

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I think it's a) 1st Newton's law... so sorry if it's wrong...

Answer:

PHYSICAL CHANGE

Explanation:

PLEASE DON'T JUST IGNORE IT

I HOPE I WILL GET A GOOD RESPONSE

equal in magnitude but opposite in direction

The best predictor of the radioactive nature of an isotope is the neutron-to-proton ratio. The correct option is second.

The proton is a subatomic particle lies inside the nucleus of an atom of element. The number of proton gives an idea of the atomic number of the element.

Isotopes are the elements having the same number of protons but they don't have the same number of neutrons.

The best predictor of the radioactive nature of an isotope is the neutron-to-proton ratio.

Thus, the correct option is second.

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According to Ampere Maxwell's law, the first half, the magnetic field can be created by the changing electric field. So, the electric field strength is changing.

In a static electric field, according to Ampere maxwell law, the divergence at one point is equal to the electric charge volume density ρ at that point divided by ε0. The physical meaning of this statement is that a circulating magnetic field is created by an electric current and also may be by an electric field that changes with time.

An electric current, or we can say a changing electric flux through a surface, has the ability to produce a circulating magnetic field around a path that bounds the given surface. The direction of the current and the induced magnetic field is known by the right-hand rule, as shown below.

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The information provided above demonstrates that the range of the tube's radius within which we are certain is from 23.7 to 24.3.

Accurate findings are desired when any quantity is being measured. Closeness of the measurements to a particular value is referred to as accuracy (like the theoretical value). It is not insignificant that measurements can contain inaccuracies; as a result, the outcome frequently includes a margin error. The sentence above displays the radius's measured value along with its margin of error.

In other words, the aforementioned statement represents a quantity's numerical value along with its tolerance, or the only permissible (and conceivable) values to ensure that the measurement is accurate. The information provided above demonstrates that the range of the tube's radius within which we are certain is from 23.7 to 24.3.

These are all valid radius values, along with all others within this interval. By increasing the number of trials in a measurement, the value for the upper and lower bounds of the error can be decreased.

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Answer:

Voltage is required for there to be a current but resistance can effect the amount of current.

Answer:

the answer is voltage

Explanation:

we just finished this unit in class

The role played in the group by the different members are:

Dione locks in her group in team-building exercises, which makes a difference reinforce their connections and advances collaboration. Dean's mean-spirited behavior, steady feedback, and endeavors to form clashes among group individuals are counterproductive.

Ronald relegates errands to his group individuals based on their capabilities, ensuring that each part contains a part that adjusts with their aptitudes. Donna makes openings for her group individuals to connected with each other and work as a beneficial group.

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Answer:

126 mWb

Explanation:

Given that:

length (L) = 50 cm = 0.5 m, radius (r) = 5 cm = 0.05 m, current (I) = 10 A, number of turns (N) = 800 turns.

We assume that the magnetic field in the solenoid is constant.

The magnetic flux is given as:

\(\phi_m=NBAcos(\theta)\\Where\ B\ is\ the\ magnetic\ field\ density,A\ is \ the\ area.\\But\ B =\mu_onI.\ n \ is\ the\ number\ of\ turns\ per\ unit \ length=N/L\\Therefore,B=\frac{\mu_oNI}{L} \\substituting\ the\ value\ of\ B\ in\ the\ equation: \\\phi_m=\frac{NAcos(\theta)*\mu_oNI}{L} .\ But \ \theta=0,cos(\theta)=1\ and\ A=\pi r^2\\ \phi_m=\frac{N^2\pi r^2\mu_oI}{L} \\Substituting\ values:\\\phi_m=\frac{800^2*(\pi*0.05^2)*(4\pi*10^{-7})*10}{0.5}=0.126\ Wb=126\ mWb\)

The new gravitational force between the two planets, when they are moved to two million miles apart, is 250,000 N

The gravitational force between two objects can be calculated using Newton's Law of Universal Gravitation, which states that the force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Given:

Initial distance between the planets = 1 million miles

Initial gravitational force = 1,000,000 N

Final distance between the planets = 2 million miles

To determine the new gravitational force, we need to compare the ratios of the distances and apply the inverse square law.

Let's denote the initial distance as d1, the initial gravitational force as F1, the final distance as d2, and the unknown final gravitational force as F2.

According to the inverse square law, the ratio of the gravitational forces is the square of the ratio of the distances:

(F2/F1) = (d1/d2)²

Substituting the given values:

(F2/1,000,000 N) = (1 million miles / 2 million miles)²

Simplifying:

(F2/1,000,000 N) = (1/2)²

(F2/1,000,000 N) = 1/4

F2 = (1/4) * 1,000,000 N

F2 = 250,000 N

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Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it takes 10L/(5L+2L) = 10/7 hours

Answer:

A critical angle of 60.1°

Explanation:

Let's say

n1 Refractive index of rarer medium

n2 Refractive index of denser medium

So using the relation

စc= Sin^ -1(n1/n2)

So

စc = Sin^-1(1.3/1.5) = 60.1°