A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is

Answer:

C. Exothermic Reaction

Explanation:

Let's go through the choices

A. Combustion - Combustion is a highly exothermic / redox reaction which produces light and heat (i.e basically it bursts into flames). In the description, the only reaction is that it feels warm, hence this is not the answer.

B. Endothermic - Recall that endothermic reactions absorbs heat and thus cools the surroundings thereby making test tube feel cooler. this is obviously not the case so this is not the answer.

C. Exothermic - Recall that exothermic reactions releases heat and thus causes the surroundings thereby making the test tube feel warmer (or hotter in some cases). This describes our situation so THIS IS THE ANSWER.

D. Endergonic reactions require an input of energy from an external source that is adsorbed by the reaction (for example if heat was applied by an external source). In this case, there is no mention of additional energy sources. Hence this is probably not the answer.

The energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

To calculate the energy per photon, we can use the equation: E = hf, where E represents the energy, h is the Planck's constant (6.62607015 × 10^-34 J·s), and f is the frequency of the photon. Given that the frequency is 1260 kHz, we need to convert it to hertz (Hz) by multiplying it by 10^3:

Frequency = 1260 kHz × 10^3 = 1.26 × 10^6 Hz

Now, we can substitute the values into the equation:

E = (6.62607015 × 10^-34 J·s) × (1.26 × 10^6 Hz)

E = 8.33929859 × 10^-28 J

The answer is given in scientific notation as 8.34 × 10^-28 J. However, the question specifically asks for the answer in the format of 0.00×10^0. To achieve this, we can multiply the result by 10^3 and adjust the exponent accordingly:

E = (8.33929859 × 10^-28 J) × (10^3)

E = 8.33929859 × 10^-25 J

Thus, the energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

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It is important to clean the surface of cuvettes before performing an absorbance measurement to ensure accurate and reliable results.

Cleaning the cuvettes removes any contaminants or residues that could interfere with the measurement and lead to inaccuracies in the absorbance readings.

Spectroscopy is a branch of physics that focuses on the study of interactions between matter and electromagnetic radiation. It involves analyzing the properties of light, such as its intensity, wavelength, and frequency, to gain insights into the structure and behaviour of atoms, molecules, and materials.

In absorbance measurements, the cuvette acts as the sample holder through which light passes. Any impurities on the cuvette's surface can scatter or absorb light, affecting the intensity of the transmitted light. This interference can lead to incorrect measurements and impact the validity of the data.

By cleaning the cuvette surface, any substances that may be present, such as dust, fingerprints, or residual chemicals from previous experiments, are removed, minimizing the chances of interference. This allows for precise and consistent measurements of absorbance, enhancing the reliability of experimental data. Regular cleaning and maintenance of cuvettes are essential practices to ensure accurate and reproducible results in absorbance spectroscopy.

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(a) The heat diffusion equation for the spoon handle can be derived using the one-dimensional conduction equation:

d²T/dx² = (1 / α) * dT/dt

where T is the temperature, x is the position along the handle, t is the time, and α is the thermal diffusivity given by α = k / ρC.

The boundary conditions are as follows:

At x = 0 (the interface between water and the handle), the temperature is T_water (100°C).

At x = L (the tip of the spoon handle), there is no heat loss (insulated), so the heat flux is zero.

(b) To solve the equation, you need to apply appropriate initial and boundary conditions. Assuming the spoon handle starts at a uniform temperature T_initial, the initial condition is T(x, 0) = T_initial for 0 ≤ x ≤ L.

Using appropriate numerical methods or analytical solutions for the heat diffusion equation, you can solve for the temperature distribution along the handle and determine the temperature at the tip (x = L = 20 cm).

(c) The overall heat transfer from the spoon to the air can be calculated using the heat transfer rate equation:

Q = h * A * (T_handle - T_infinity)

where Q is the heat transfer rate, h is the convection coefficient, A is the surface area of the handle exposed to air, T_handle is the temperature at the handle surface, and T_infinity is the air temperature.

(d) To repeat the calculations for a spoon made of a more conductive material with thermal conductivity k = 400 W/m-K, you would need to update the thermal diffusivity α in the heat diffusion equation and re-solve for the temperature distribution and the overall heat transfer. The rest of the procedure remains the same.

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Answer:

reaches a higher temperature is LEAD.

Explanation:

In this exercise we have a calorimeter problem, in which the initial energy is absorbed by each body

       E₀ = m c_e ΔT

where E₀ = 5000 J

       ΔT = \(\frac{E_o}{m \ c_e}\)

the specific heats for each material are tabulated

      material   c_e (J / kg ºC)

     glass           837

     copper       387

     lead            128

     gold            129

As they indicate that the mass of the materials is the same, the one with the greatest temperature difference is the one with the least specific heat, consequently the one that reaches a higher temperature is LEAD.

let's calculate for a mass of 1 kg

glass

       ΔT = 5000/(1 837)

       ΔT = 6ºC

Lead

       ΔT = 5000/(1 128)

       ΔT = 39.1º

GOLD

       ΔT = 5000/(1 129)

       ΔT = 38.8º C

The composition of a particle with a css quark might be unaffected by an electric field. Option A is correct.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

The complete question is:

"A particle unaffected by an electric field could have a quark composition of. A) css B) bbb C) udc D) uud."

A particle unaffected by an electric field could have a css quark composition.

Hence, option A is correct.

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Answer: 15,115 J

Explanation: --APEX-- JUST TOOK THE TEST

Answer:

15,115 J

Explanation:

Answer:

Inclined Plane - A ramp, for example a wheelchair ramp to help move to another level.

Wheel & Axle - On lawnmowers and wheelbarrow.

Lever - A seesaw

Pulley - adjustable clothesline (think from back then when you would put clothes out to dry them)

Screw - the bottle caps you screw on or off

Dark nebulae are thought not to contain stellar nurseries because they are primarily composed of gas and dust, which are the building blocks of stars, but they are too cold and dense to collapse and form stars.

A nebula is a distinctively luminous region of the interstellar medium, which may be made up of cosmic dust, neutral, neutrally ionized, or molecular hydrogen.

Because dark nebulae are predominantly made of gas and dust, the raw materials for stars, but are too cold and dense to collapse into stars, it is believed that they do not contain stellar nurseries.

In other words, the gas and dust in a black nebula are not in an ideal environment to start the star-forming process.

The quantity of light that is accessible for star formation may be diminished by the dust particles in dark nebulae that can absorb and scatter light.

Thus, despite the fact that black nebulae may contain a lot of gas and dust, they are not suitable for the formation of new stars, and are unlikely to contain stellar nurseries.

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The angle when the car have traveled when the magnitude of its total acceleration is 2.2m/s^2 is 56.31°.

Acceleration is the rate of change in velocity to the change in time.

Tangential acceleration is the rate at which a tangential velocity varies in the rotational motion of any object. It acts in the direction of a tangent at the point of motion for an object. The tangential velocity also acts in the same direction for an object undergoing circular motion.

The angle is given by,

\(\theta = \dfrac{1}{\pi} \times \dfrac{\sqrt{(-a_1^2)+(a_2^2)}}{2a_{1}} \times 180^0\)

, where \(a_1\) is the tangential acceleration, \(a_2\) is the total acceleration.

Using 1.3 and 2.2 for \(a_1\) and \(a_2\) respectively.

   \(\theta = \dfrac{1}{\pi} \times \dfrac{\sqrt{(-1.3^2)+(2.2^2)}}{2(1.3)} \times 180^0\)

   \(\theta = \dfrac{1}{\pi} \times 0.98 \times 180^0\)

θ = 56.31°

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time (t) = 45 sec

Speed (v) = 14 m/s

mass (m) = 5kg

F = Force

F = m*a

a = acceleration = Δv / Δt = 14m/s / 45 s = 0.31 m/s^2

F = 5 kg * 0.31 m/s^2 = 1.56 kgm/s^2 = 1.56 N

Answer: C. high mobility and small groups with flexible affiliation

Explanation: Foragers are nomadic people who move frequently to find food and resources, and their social organization is typically based on small, flexible groups rather than fixed communities.

- Lizzy ˚ʚ♡ɞ˚

The inductance of the solenoid with 500 turns, a length of 25.0 cm, and a cross-sectional area of 6.0 cm² is approximately 1.25664 mh.

The inductance of a solenoid can be calculated using the formula L = (μ₀N²A) / l, where L is the inductance, μ₀ is the permeability of free space (4π x 10^-7 T·m/A), N is the number of turns, A is the cross-sectional area, and l is the length of the solenoid.

In this case, the solenoid has 500 turns, a length of 25.0 cm (0.25 m), and a cross-sectional area of 6.0 cm² (0.0006 m²). We can substitute these values into the formula to find the inductance:

L = (μ₀N²A) / l
 = (4π x 10^-7 T·m/A) * (500² turns²) * (0.0006 m²) / 0.25 m

Simplifying the calculation:
L = (4π x 10^-7 T·m/A) * (250000 turns²) * (0.0006 m²) / 0.25 m
 = 1.25664 x 10^-3 T·m²/A

Converting to millihenries (mh):
L = 1.25664 x 10^-3 T·m²/A * 1000 mh/T·m²
 = 1.25664 mh
Therefore, the inductance of the solenoid is approximately 1.25664 mh.

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The change in internal energy of the ideal gas, which undergoes an isobaric expansion from 1.00 m³ to 3.00 m³ while 12.5 kJ of heat is transferred to the gas, is 7.5 kJ.

The change in internal energy of an ideal gas can be calculated using the first law of thermodynamics, which states that the change in internal energy (ΔU) is equal to the heat transfer (Q) minus the work done (W) on or by the gas.

The heat transfer (Q) can be determined by the amount of energy transferred to the gas, which is given as 12.5 kJ.

The work done (W) can be calculated using the formula: W = PΔV, where P is the constant pressure and ΔV is the change in volume.

Given that the pressure (P) is constant at 2.50 kPa, and the change in volume (ΔV) is 3.00 m³ - 1.00 m³ = 2.00 m³, the work done can be calculated as follows:

W = PΔV = (2.50 kPa)(2.00 m³) = 5.00 kJ

Now we can calculate the change in internal energy (ΔU):

ΔU = Q - W = 12.5 kJ - 5.00 kJ = 7.5 kJ

Therefore, the change in internal energy of the gas is 7.5 kJ.

The change in internal energy of the ideal gas, which undergoes an isobaric expansion from 1.00 m³ to 3.00 m³ while 12.5 kJ of heat is transferred to the gas, is 7.5 kJ. This change is calculated by subtracting the work done on the gas (5.00 kJ) from the heat transfer (12.5 kJ) according to the first law of thermodynamics.

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In this context, "factor" refers to an element that contributes to the rating, and "power" refers to the rate at which energy is transferred or converted. The time factor is already included in the power rating of a lamp bulb because power is measured in watts (W), and a watt is equivalent to one joule per second (J/s). This means that the 100 W rating of the lamp bulb already accounts for the energy consumption per unit of time (1 W = 1 J/s).

The answer is c) Time is not important when considering power. Power is defined as the rate at which energy is transferred or work is done, and is measured in watts. It does not take into account how long the transfer or work occurs. Therefore, a lamp bulb's power rating is simply 100 watts and does not include any time factor.
Hi! I'd be happy to help you with your question. The correct answer is:

b) It is included since a watt is a J/s.

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The value for the total energy that reaches each square meter of Earth from the Sun each second is called solar irradiance.

Solar irradiance is a measure of the power per unit area received from the Sun in the form of electromagnetic radiation, particularly in the visible and ultraviolet (UV) wavelengths. The average solar irradiance at the outer atmosphere of Earth is approximately 1,366 watts per square meter. However, due to the Earth's atmosphere, the actual amount of solar energy that reaches the surface of the Earth is slightly lower, around 1,000 watts per square meter on a clear day.

Solar irradiance is a crucial factor in understanding Earth's climate, weather patterns, and the functioning of ecosystems. It is essential for the process of photosynthesis in plants, and it is also a key input for solar power generation. Solar irradiance varies based on factors such as time of day, latitude, and weather conditions.

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A hydraulic lift's input pressure is 1200 Pa. If the output force on the other side is 800 N, the output surface area is 0.67m^2

Given the input pressure (P1) = 1200Pa

Output force (F2) = 800N

We know that P= F/A where A is area of cross section

Let the input force be F1 and area is A1

Then by pascals law we say that:

F1/A1 = F2/A2

1200 = 800/A2 (since P1= F1/A1)

A2 = 8/12 = 0.67m^2

Hence the area of other side = 0.67m^2

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The charge on balloon two, Q2, is +1.602 × 10⁻¹² C.

To find the charge on balloon two, first determine the total charge on balloon one. Since balloon one has N = 10⁷ excess electrons, each with a charge of e = 1.602 × 10⁻¹⁹ C, we can calculate the total charge by multiplying the number of electrons by the charge per electron:

Q1 = N × e = 10⁷ × 1.602 × 10⁻¹⁹ C = 1.602 × 10⁻¹² C

Since the balloons have equal and opposite charges, the charge on balloon two, Q2, is the opposite of the charge on balloon one:

Q2 = -Q1 = -1.602 × 10⁻¹² C = +1.602 × 10⁻¹² C

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The correct answer is 29.41 * 10⁻⁴ m/s

What is the work function?

From the photoelectric theory of Einstein, photons are emitted when light of appropriate wavelength is incident on a clean metal surface. The minimum energy that the incident light must possess is called the  work function of the metal.

We know that;

Kinetic energy = Energy of incident photon - Work function

Energy of incident photon = hf = 6.6 * 10⁻³⁴ Js * 1.51×10¹⁵ s−1

= 9.9 * 10⁻¹⁹ J

Work function = Energy of incident photon - Kinetic energy

8.17 * 10⁻¹⁹ = 9.9 * 10⁻¹⁹ - KE

KE = 8.17 * 10⁻¹⁹ - 9.9 * 10⁻¹⁹ = -1.73 *10⁻¹⁹ J

Kinetic energy = 0.5mv²

But since photons are massless so Kinetic energy will be equal to 0.5v².

KE = 0.5v²

-1.73*10⁻¹⁹ = 0.5v²

v² = -865*10⁻¹⁶

v = 29.41 * 10⁻⁴ m/s

Therefore, the velocity of ejected photons from a gold surface having work function 8.17x10⁻¹⁹ and frequency 1.51 x 10¹⁵  is 29.41 * 10⁻⁴ m/s.

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Answer:

friction I would guess? you didnt leave any options.

Explanation:

Answer:

F = G M m / R^2 = 6.67E-11 * 1.99E30 * 5.98E24 / (1.5E11)^2

F = 6.67 * 1.99 * 5.98 / 2.25 E21 Newtons

F = 3.53E22 N

A torque's characteristic direction can be categorized as either clockwise or counterclockwise.

The rotational counterpart of linear force is torque. Depending on the subject of study, it is also known as the moment, moment of force, rotating force, or turning effect. It represents a force's ability to cause a change in the body's rotational motion.

Magnitude is referred to as an object's maximal size and direction.

A torque's characteristic direction can be categorized as either clockwise or counterclockwise.

It is possible to describe the direction of a torque as clockwise or counterclockwise, and the magnitude of the torque produced by a given force is equal to Fd.

A torque's characteristic direction can be categorized as either clockwise or counterclockwise.

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The force that acts in a direction opposite to the motion of the moving object is called drag or air resistance.

Drag or air resistance is a force that acts on a moving object in a fluid medium, such as air or water, opposing its motion. It acts in a direction opposite to the motion of the object and is caused by the friction and pressure differences between the fluid and the object's surface. Drag force increases with the velocity of the object and its surface area, and it's usually modeled as a quadratic function of the velocity. For example, when a car is moving, the air resistance acts in the opposite direction of the car's motion, slowing it down. The drag force is not the only force that acts on the object, but it's one of the most significant forces acting on it, especially for objects moving at high speeds.

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Answer:

Acceleration

Explanation:

For example, if the acceleration is zero, then the velocity-time graph is a horizontal line (i.e., the slope is zero). If the acceleration is positive, then the line is an upward sloping line (i.e., the slope is positive).

Answer:

3300 N

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 1100 Kg

Acceleration (a) = 3 m/s²

Force (F) =?

Force is defined by the following equation:

Force (F) = mass (m) × acceleration (a)

F = m × a

With the above formula, we can obtain the force of the tow truck as follow:

Mass (m) = 1100 Kg

Acceleration (a) = 3 m/s²

Force (F) =?

F = m × a

F = 1100 × 3

F = 3300 N

Therefore, the force of the tow truck is 3300 N

Answer:

because the friction in the baloons and the magnetism make it like nuclear fision

Explanation:

The magnetic field and friction between the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

Nuclear fusion is the process through which light elements interact to create heavier elements (up to iron). Significant amounts of energy are released when interacting nuclei are from elements with low atomic numbers, such as hydrogen (atomic number 1) or its isotopes deuterium and tritium.

Thermonuclear weapons, or hydrogen bombs, which were created in the decade immediately following World War II, were the first to utilize the tremendous energy potential of nuclear fusion.

There are two main categories of fusion reactions: those that maintain the ratio of protons to neutrons and those that convert protons to neutrons.

Therefore, the magnetic field and friction in the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

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The change in kinetic energy of the river that leads up to this event can be described as a decrease in speed.

The speed of the river starts to decrease as the river nears the ocean and the river channel becomes more gradual. This gradualization of the river channel decreases the gradient or slope of the river channel. As the gradient of the river channel decreases, there is a decrease in the potential energy of the river. The decrease in potential energy causes a decrease in the kinetic energy of the river. This decrease in kinetic energy leads to a reduction in the velocity of the river. As a result of the decreased velocity of the river, it loses its ability to transport the sediment. This causes the sediment to be deposited at the river mouth, where the river meets the ocean.

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Answer:

Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water.

Explanation:

Destructive waves erode through four main processes; Hydraulic Action, Compression, Abrasion and Attrition.

Answer:

Below! ;)

Explanation:

Lots of people have the idea that erosion is where something is eroded away, and EVEN I thought that once, but erosion is the process in which parts of land are moved to a different province. Erosion can sometimes also bring in invacious species.

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