A student is pushing on a heavy door, trying to slide it open. Their friend stands behind them and helps push. How have the forces changed

Answer:

359cm

Explanation:

The change in length of the cord due to a stretching force of 0.5N is given by Hooke's law:

ΔL = k * ΔF

Where ΔL is the change in length, k is the spring constant and ΔF is the change in force.

Since the spring constant for the cord is 3N/cm, the change in length due to a stretching force of 0.5N is:

ΔL = (3N/cm) * (0.5N) = 1.5 cm

Since the cord is already 350cm long, the total length of the cord when the stretching force is 0.5N is 350cm + 1.5cm = 351.5cm.

To find the length of the cord when the stretching force is 2.5N, we can use the same formula:

ΔL = (3N/cm) * (2.5N) = 7.5 cm

The total length of the cord when the stretching force is 2.5N is therefore 351.5cm + 7.5cm = 359cm.

A temperature increase of an order of 81 will cause an object's thermal output radiated per unit surface area to double, assuming that its emissivity is unaltered by the temperature change.

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The truck bed and the crate's static coefficient of friction, assuming the crate doesn't slide, is 0.400.

Between the truck bed and the crate, there is 0.64 coefficient of static friction. When the bed is in the position depicted, the truck must move quickly to the right in order to make the crate slide.

The resistive friction force (Fr) divided by the normal or perpendicular pushing force (N) yields the coefficient of friction, which is a numerical value. The formula fr = Fr/N is used to represent it.

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A human lifetime of 80 years is equal to 29,200,000 seconds.

The average human lifetime is typically 79 years, although this can vary greatly depending on various factors such as lifestyle, genetics, and environment. Generally, most people can expect to live anywhere from their late 60s to their mid-80s. However, some people live much longer, and some much shorter. Even within the same family, the range of lifespans can be quite varied.

This can be calculated by multiplying the number of seconds in a day (86,400) by the number of days in a year (365) by the number of years in a human lifetime (80).
86,400 x 365 x 80 = 29,200,000 seconds

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Calculate the angle between the vector connecting the force's application point and the pivot point and the direction of the applied force. You may calculate the torque by multiplying r by F and sin.

The force that can cause an object to revolve around an axis is measured in torque. Torque accelerates an object in an angular direction, much like force does in linear kinematics.

An angular force known as a torque tends to produce rotation along an axis, which could be the center of mass or a fixed point. Torque can also be thought of as a thing's capacity in order to overcome turning resistance, such as a shaft or a gear, that is rotating.

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F PS-10-1-prime.gif > f before passing the horn, f PS-10-1-prime.gif < f after passing it describes the frequency f PS-10-1-prime.

Hence, Option A is correct.

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Using a specific kind of raga played over a gramophone and loudspeakers, Singh replicated the experiment with field crops. Crop sizes grew to 25–60% over the average for the region. According to Singh, the violin's music has the biggest impact on plant development.

Nutrient interactions in the soil, which alter the availability of nutrients to plants, illustrate the range of interactions that may take place. High concentrations of one nutrient in the soil can conflict with the availability and absorption of other nutrients.

Loamy soils, which combine sand, clay, and silt particles, are thought to be the most fertile form of soil.

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Answer:

W = m g = 80 kg * 9.80 m/s^2 = 784 N    using g = 9.80 m/s^2

W' = (W - .8 W) 80 = .2 W  = 157 N

W' = 80 kg * g' = 157 N    where g' is the reduced field

g' = 1.96 m / s^2

As a result, X heat required = 27Q is the amount of heat needed to raise the temperature.

first case

Q = Specific Heat * Density of Sphere* (4/3*pi*D^3) * (7-4)     -1

Second case

X = Specific Heat * Density of Sphere* (4/3*pi*(3D)^3) * (7-4)    -2

Dividing 1 and 2 we get

Q/X = 1/27

27

where Q is the amount of heat that is transported to or from the item, m is the object's mass, C is the material's specific heat capacity, and T is the resultant temperature change of the object.

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The velocity of the ball is 1 m/s which starts with a speed of 2.0 m/s and slows at a constant rate of 0.5 m/s².

According to the data given:

Speed of the ball: 2.0 m/s

Acceleration: 0.50 m/s²

Time is 2.0 s

The ball starts rolling up the hill with a speed of 2m/s (u=2 m/s²) and it decelerates at a constant rate of 0.5 m/s² (a = -0.5 m/s², minus because it decelerates).

The equation for calculating velocity is:

v = u + a x t,  t represents time here

So, ball's velocity after 2 seconds is:

v = 2m/s + (-0.5m/s² x 2s)

v = 2m/s + (-1m/s)

v = 1m/s

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Since torque is directly proportional to body mass, while the lever arm remains fixed and the mass of the stone grows, so does the torque.

Lever:

Lever is a type of simple machine composed of a stiff beam and a fulcrum. The fulcrum is the point on which the beam pivots. The effort and load are delivered to either end of the beam. A load is applied to the opposite end of a lever when force is applied to the one end.

The three classes of levers are first, second, and third class levers.

The fulcrum of superior levers is positioned between the weight and the effort.

Levers of inferior quality with weight between the fulcrum and the effort

Third-class levers need effort between movements fulcrum and load.

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The magnitude of the passenger's acceleration as she passes through the lowest point in her circular motion is the centripetal acceleration.

This is given by the equation a = v^2 / r, where v is the velocity of the passenger and r is the radius of the circle. Therefore, the magnitude of the passenger's acceleration is equal to the square of her velocity divided by the radius of the circle.

For example, if the passenger is travelling at 10 m/s in a circle with a radius of 5 m, then her centripetal acceleration would be 10^2 / 5 = 20 m/s^2.

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Answer:

this because the surface tension was lowered by using an impurity or rising the temp of the water

It also assumes that many of your portrait are in focus. A wide aperture setup admits so much light into to the lens and lessens the depth of field.

A cameras is a piece of equipment that takes pictures and comprises of either a plate or light-sensitive film inside of a light-proof casing. The camera's shutters opens and closes during the taking of a picture, exposed the photosensitive film to sight and recording the scene on the film.

The traditional camera depicted in the illustration has been largely replaced by digital cameras and mobile phones today.

Less light enters the lens through a tiny aperture. Additionally, it suggests that more your photo will be sharp. More light enters the lens when the aperture is wide open, but the field of view is also reduced. You can change the aperture setting to help balance overall exposure and control the amount of the composition is already in focus.

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Stage and film versions of a drama are similar in that the audience must use context clues such as lighting, sound effects, and dialogue to infer the mood of a scene. This requires the audience to pay attention to the details of the performance, as subtle changes in these elements can drastically change the overall tone of the production.

The main difference between a stage and film version of a drama is that a stage production relies heavily on the physicality of the actors and their interactions with one another, while a film production relies heavily on the technical aspects such as camera angles, lighting, and sound design. Additionally, a stage production is performed live in front of an audience, while a film is created in a studio and viewed later by an audience.

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A cyclic process is a thermodynamic process where the initial and final states are identical. As a result, both the system's initial and end internal energies are constant. As a result, the system's capacity to absorb heat is determined by the work it performs during a cycle.

A thermodynamic process is one that modifies the system's thermodynamic state. A transition from an initial to a final state of thermodynamic equilibrium characterizes a change in a system. The actual course of the process is not the main focus in classical thermodynamics and is frequently disregarded.

There are several different types of thermodynamic processes, such as (a) isothermal, in which the system's temperature stays constant; (b) adiabatic, in which no heat is exchanged; (c) isobaric, in which the system's pressure stays constant; and (d) isochoric, in which the system's volume stays constant.

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Answer:

kgm/s(-1)

Explanation:

the units of momentum will be the product of the units of mass and velocity. Mass is measured in kg and velocity in ms-1, therefore, the SI unit of momentum will be kgm/s(-1).

Answer:

9000N

Explanation:

gravitational field strength of earth is approximately 10N/kg .

900kg×10N/kg

=9000N

The impulse that the pelton wheel applies to the water is equal  to the change in momentum of the water after hitting the flat paddle wheel.

Impulse is a measure of the force applied to an object over a period of time, and it is equal to the change in momentum of the object.

In the case of the pelton wheel, the force is applied to the water by the flat paddle wheel, and the change in momentum of the water is the result of that force.

Therefore, The impulse of the pelton wheel is therefore equal to the change in momentum of the water after it hits the paddle wheel.

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Mass doesn't affect change in temperature

Simply put, mass is the quantity of material that is present. As a result, since there will always be the same amount of matter present, changing the temperature has no direct impact on mass.

A substance's temperature is a gauge for determining how hot or cold it is. It serves as a gauge for typical kinetic energy. The molecules of the substance move very swiftly at high temperatures. The molecules move very slowly when the temperature is low.

A thermometer is used to measure temperature, however there are numerous other sorts of units that can represent temperature. Fahrenheit, Celsius, and Kelvin are the most widely used units. Heat and temperature are two different concepts that shouldn't be confounded. Heat, as opposed to temperature, is a type of energy and is quantified in Joules.

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The resistance of the filament which carries the current of 2 A and has a potential difference of 10 V is b) 5 ohms

The current passing through the filament = 2A

The potential difference in the filament = 10 V

The resistance of the filament can be found using the formula,

                  R = V/I

where R is the resistance of the filament

           V is the potential difference between the filament

           I is the current passing through the filament

Let us substitute the known values in the above equation, we get

               R = 10 / 2

                  = 5 ohms

Therefore, the resistance of the filament is 5 ohms

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Explanation:

This intense stretching method uses bouncing movements to push your body beyond its normal range of motion. Whereas static stretches are performed slowly and gradually, the ballistic method stretches muscles much farther and faster. You can do many of the same stretches as ballistic or static stretches.

This minimum value is 223.9 m.

​

The attribute of motion of an item travelling a circular path is characterised as centripetal acceleration. Centripetal acceleration is defined as any item travelling in a circle with an acceleration vector pointing towards the centre of that circle.

The acceleration felt when moving in a uniform circular motion is known as centripetal acceleration. It always points toward the rotational centre. It is parallel to the linear velocity. The centripetal force is measured in an inertial frame of reference, whereas the centrifugal force is measured in a non-inertial frame of reference. Centripetal force is directed towards the axis of rotation or the centre of curvature, whereas centrifugal force is directed away from the circle's centre.

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According to the question, you would need to add a 40 µF capacitor in order to produce a total capacitance of 50 µF.

What is the capacitor?

An electrical component known as a capacitor stores energy in an electric field. It is made up of two metal plates separated by an insulator, such as air, paper, plastic, or ceramic. When a voltage is applied to the plates, a charge is stored in the electric field. This charge can then be released when the voltage is removed. Capacitors are used in a variety of applications, such as providing energy storage in power supplies, filtering signals in electronic circuits, and providing energy to motors in electrical devices. They can also be used to balance out electrical loads in a circuit, and provide a steady current for the circuit. Capacitors can vary in size, shape, and material depending on the application.

In this case, 90 µF + 40 µF = 130 µF, and 130 µF - 90 µF = 40 µF. Therefore, you would need to add a 40 µF capacitor to the 90 µF capacitor to achieve a total capacitance of 50 µF.

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The value of d is 401.550.

Momentum can be viewed as a body's "power" while it is moving, or the amount of force it can exert on another body. For instance, a baseball (small mass) thrown quickly can have the same momentum as a bowling ball (big mass) going extremely slowly (low velocity) (high velocity).

"The motion of an item equal to the product of its mass and its velocity" is referred to as momentum. When we say anything has momentum, we are referring to its precise mass and direction of motion.

C+ΣMA = ( 200 cos 45) (d cos 30+0-3) -

(200 sin 45°) (d sin 30°)= -120

(200COS 45°) (0.3) + (200 cos 45°) (d cos30) +

(200sin 45') (d sin 30") = 120

d = 120- (200 cos 45) (0.3) / 200 (cos 45 Cos 30+ sin 45 sin 30)

d = 0.40155m

d = 401.55mm

d = 401.550

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Complete Question -

"Scientific evidence for warming of the climate system is unequivocal."

Organisms such as diatoms, forams, and coral) can obey useful climate proxies. Other proxies involve ice cores climate, tree rings, and sediment cores. Chemical deputy records include isotope ratios, elemental examination, biomarkers, and biogenic silica.

Climate analyzers use every possible direct and indirect compilation to study the full history of Earth's climate, ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers appear that Earth's climate greets to changes in greenhouse gas levels.

So we can conclude that Climate change is most usually measured using the average surface temperature of the planet.

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The ECG waveform has many components such as segments,  waves, and intervals; when these components differ from the expected forms, this indicates dysrhythmia.

An abnormal or irregular heartbeat is referred to as cardiac dysrhythmia. Your heart may beat too slowly or too fastly if you have dysrhythmia. Or your heart's rhythm may be disturbed, giving you the sensation that your heart missed a beat.

Thus, when the ECG waveform is different than normally it is expected, it shows a sign of dysrhythmia. When a person experiences dysrhythmia, and the rate of their heartbeat becomes irregular but still, it lies within the normal range.

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The required net force on the car with certain mass and travelling with deceleration is said to be 5000 N.

Given that,

Mass of the car m = 1000 kg

Velocity of the car v = 20 m/s

Time t = 4 sec

Net force on the car = ?

According to Newton's second law of motion, it is said mathematically that, F = m a ---(1)

Acceleration a can be written as the rate of velocity.

a = (v-u)/t = (0 - 20)/4 = - 5 m/s² ---(2)

Substituting (2) in (1) we have,

F = m a = 1000 × - 5 = -5000 kg m/s² or -5000 N

Thus, the required net force on the car is 5000 N.

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The Cessna Cardinal, a single-engine light plane, has a wing area of 16.2 m² and an aspect ratio of 7.31 with span efficiency factor of 0.62 then the induced drag when the total weight is 9800 N is 18.8 N.

Given that,

Wing area (A) = 16.2m²

Aspect ratio (r) = 7.31

Efficiency factor (e) = 0.62

Weight of plane (W) = 9800 N

Velocity of airplane (v) = 251 km/h = 251× 5/18 = 69.72 m/s

We know,

Dynamic pressure (p) = 1/2ρv²

where ρ is density of plane = 1.225

p = 1/2 × 1.225 × 69.72 × 69.72 = 2977.29 pa

Lift coefficient Cl = W/p × A = W/(1/2ρv²) A

where, A is the area of wing

Cl = 9800/2977.29 × 16.2 = 0.203

Induced drag coefficient (Cd) = Cl²/πer² = (0.203 × 0.203)/(π × 0.62 × 7.31 × 7.31) = 0.041/(104.08) = 0.39×10⁻³

Induced drag (d) = p × A × Cd = 2977.29 × 16.2 × 0.39 × 10⁻³ = 18.8 N.

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The electric field in the region r ≤a is E [tex]= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r[/tex]

The total charge is enclosed within the Gaussian surface.

Q[tex]_{enc}[/tex] = 2Q - Q = Q

Therefore, applying Gauss's law over the Gaussian surface

∫[tex]_{s}[/tex]E.dS = Q[tex]_{enc}[/tex]/ε₀ ⇒ E.4πr² = Q/ε₀ ⇒ E = Q/4πε₀r²(r)

In question solution:

A[tex]_{sphere}[/tex] = 4πr²

ΦE = ∫E⋅dA

ΦE = q/ε₀

  E = q/(A⋅ε₀)

  E = q/(4πr²ε₀)

for r≤a, qin = -Q

               E [tex]= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r[/tex]

So, the electric field in the region is   E [tex]= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r[/tex]

Your question is incomplete but most probably your full question was:

A uniformly charged ball of radius a and charge −Q is at the center of a hollow metal shell with inner radius b and outer radius c. The hollow sphere has a net charge of +2Q.

Part A: Determine the electric field strength in the region r ≤a. Give your answer as a multiple of Q/E0. Express your answer in terms of some or all of the variables a, b, c, r, and the constant π.

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