a ball is thrown upward with a speed of from the edge of a cliff, ft above the ground. find its height above the ground seconds later. when does it reach its maximum height? when does it hit the ground?

Answer:

Pemain A

Explanation:

Mengingat data berikut;

Kecepatan pemain A = 12 m/s

Kecepatan pemain B = 36 km/h

Untuk menentukan siapa pelari tercepat di antara dua pemain;

Pertama-tama, kita harus mengubah kecepatan menjadi satuan standar pengukuran yang sama.

Jadi, mari kita gunakan pengukuran umum meter per detik.

Konversi:

36 km/h = (36 * 1000)/(60 * 60)

36 km/h = 36000/3600

36 km/h = 10 m/s

Kecepatan pemain B = 10 m/s

Oleh karena itu, dibandingkan dengan kecepatan pemain A; pemain A lebih cepat.

Light, being both a wave and a particle, displays many properties similar to both of them. Light, like waves, travels at different speeds through mediums because they provide any variable amount of resistance. Even air resists light to a degree, and light speed through air is slower than light speed in a vacuum.

Answer:

it covers your phone so when you drop it it reduces the chance and breaking

Answer:

λ = 1.8 x 10⁻⁷ m = 180 nm

Explanation:

First we find the work function of tungsten by using the following formula:

∅ = hc/λmax

where,

∅ = work function = ?

h = Plank's Constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λmax = maximum wavelength for photoelectric emission = 230 nm

λmax = 2.3 x 10⁻⁷ m

Therefore,

∅ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(2.3 x 10⁻⁷ m)

∅ = 8.64 x 10⁻¹⁹ J

Now we convert Kinetic Energy of electron into Joules:

K.E = (1.5 eV)(1.6 x 10⁻¹⁹ J/1 eV)

K.E = 2.4 x 10⁻¹⁹ J

Now, we use Einstein's Photoelectric Equation:

Energy of Photon = ∅ + K.E

Therefore,

Energy of Photon = 8.64 x 10⁻¹⁹ J + 2.4 x 10⁻¹⁹ J

Energy of Photon = 11.04 x 10⁻¹⁹ J

but,

Energy of Photon = hc/λ

where,

λ = wavelength of light = ?

Therefore,

11.04 x 10⁻¹⁹ J = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/λ

λ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(11.04 x 10⁻¹⁹ J)

λ = 1.8 x 10⁻⁷ m = 180 nm

Answer:

6) 2.6 m/s, 31°

7) 9.2 m/s

8) 1.2 s

Explanation:

I'll do #6, #7, and #8 as examples.  You can solve #9 using the equation from #7, and #10 using the equation from #8.

6) Take north to be +y and east to be +x.

Given:

vₓ = 2.2 m/s

vᵧ =  1.3 m/s

Find: v

v² = vₓ² + vᵧ²

v² = (2.2 m/s)² + (1.3 m/s)²

v ≈ 2.6 m/s

θ = atan(vᵧ / vₓ)

θ = atan(1.3 / 2.2)

θ ≈ 31°

7) Given:

Δy = -4.3 m

v₀ = 0 m/s

a = -9.8 m/s²

Find: v

v² = v₀² + 2aΔy

v² = (0 m/s)² + 2 (-9.8 m/s²) (-4.3 m)

v ≈ 9.2 m/s

8) Given:

Δy = -6.7 m

v₀ = 0 m/s

a = -9.8 m/s²

Find: t

Δy = v₀ t + ½ at²

-6.7 m = (0 m/s) t + ½ (-9.8 m/s²) t²

t = 1.2 s

The magnitude of the displacement vector of the bee will be 2 km. Because the distance between the endpoints is 2km.

A displacement is a vector in engineering and mechanics that has a length equal to the smallest distance between a point P's initial and final positions. It is a vector quantity. The SI unit of the displacement is the meter.

A honeybee leaves the hive and travels a total distance of 2 km before returning to the hive.

The bee's displacement vector will be 2 kilometers in length. Mostly due to the 2 kilometers between the terminals.

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The combination of a particle's mass and velocity produces momentum. Momentum is a vector quantity that has both magnitude and direction. The force exerted on a particle is equated to the time rate of change of momentum by Isaac Newton's second equation of motion.

First law of Newton : According to Newton's first law of motion, if a body is at rest or moving in a straight path at a constant speed, it will stay in that state or continue to move in that direction unless it is acted upon by an outside force.

Second law of Newton : According to Newton's second rule of motion, a body's rate of momentum change is inversely proportional to the force acting on it, and momentum changes occur in the direction of the net applied force.

Third law of Newton : Newton's third law of motion states that there is always an equal and opposite reaction to every action.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this.

A push or pull that an object experiences as a result of its interactions with its environment is known as a force.

Dust and smoke rising in the atmosphere as a result of an asteroid impact hinder sunlight from reaching our planet, resulting in a decrease in global temperature. Many living beings could die as a result of this incident. A small city might be destroyed if an asteroid the size of an apartment strikes Earth. A 20-story building-sized asteroid might wipe out a small nation if it were to strike Earth.

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The correct answer is option A. Increase its current and increase its voltage. To increase the electrical power of a circuit.

1.Understanding electrical power: Electrical power is calculated as the product of voltage and current in a circuit. It can be represented by the formula P = VI, where P is power, V is voltage, and I is current.

2.Voltage and current relationship: Increasing either the voltage or the current in a circuit will result in an increase in power, as long as the other value also increases proportionally.

3.Increasing current: By increasing the current flowing through a circuit, more electrical charge is transferred per unit of time, which leads to an increase in power.

4.Increasing voltage: Increasing the voltage in a circuit increases the electric potential difference across the components. This higher potential difference causes the electric charges to move with more force, resulting in an increase in power.

5.Combined effect: When both the current and voltage are increased simultaneously, the power of the circuit is multiplied, leading to the highest increase in electrical power.

Therefore, increasing both the current and voltage in a circuit (option A) is the most likely change to increase its electrical power.

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A DC motor is powered with Ea = 400V, the armature resistance is Ra = 20, the torque constant of the motor is K+ = 1 Nm/A.

The load torque intercepts the motor torque in two places, only one will be positive, drop you will again need to solve = 0. d the given details are Ea = 400VRa = 20K+ = 1 Nm/A

To find; Gear ratio G required to drive this load at its maximum operating speed.

Formula used: θ=K+ * Ia The motor torque, Tm = K+ * Ia The load torque, TL = J * dw / G The armature current, Ia = (Ea - V) / Ra By equating the motor torque and load torque, we have; K+ * Ia = TL The load torque is positive, so we have;TL = J * dw / G Since the load is operating at maximum speed, d w = 0So, TL = 0 = J * 0 / G

Thus, G is not found in the equation.

So, we can conclude that G does not affect the maximum speed of the motor. The maximum speed is determined by the back EMF, Ea, and the motor constants, K+ and Ra.

So, the gear ratio G is irrelevant in determining the maximum speed of the motor.

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The temperature of force the body after 60 minutes is 71 degrees. Let the temperature of the body after 60 minutes be T.

Since the temperature of the surrounding medium is 25 degrees Celsius and the temperature of the body cools from 95 to 85 in 30 minutes, we can find k using the following formula;dT/dt = k(T - 25)Here, dT/dt is the rate at which the body's temperature changes. It's equal to (85 - 95)/30 = -1/3Since the temperature difference is decreasing with time (body cools down), the negative sign indicates this change.

We have;dT/dt = k(T - 25)-1/3 = k(95 - 25)k = -1/70Substituting the value of k in the differential equation above, we get;dT/dt = (-1/70) (T - 25)Solving the differential equation gives the following equation:T = 25 + 60e^(-t/70)Substituting the value of t = 60 minutes (1 hour) into the equation above gives;T = 25 + 60e^(-1)T = 71 degrees Celsius (rounded to the nearest degree).

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Answer: Movement in which all positions of both the waves rotate around the directions at right angles to the axis of the wave's movement.

Explanation: Hope this help

I suggest that the students move forward with option A.

Test funnels of the same size and material with varying sized openings. This will allow them to determine the optimal size for the opening that will help direct the marble to the launch pad. Once they have determined the optimal size, they can move forward with constructing the funnel with that size opening.

If you've ever witnessed two individuals attempting to converse at the same time, you know how crucial listening is. In reality, taking turns talking and making sure everyone feels heard are key components of a good conversation.

Eccentricity is frequently linked to brilliance, intellectual prowess, or inventiveness. The person's unconventional behavior can be interpreted by others as the outward manifestation of their special intelligence or creative urge.

When you describe someone as eccentric, you're referring to their outlandish behavior and their unconventional habits or beliefs. He is a peculiar individual who enjoys donning a hat and dark glasses. Odd, unusual, and bizarre are synonyms.

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Answer: 1 m/s

Explanation: 1 km = 1000 m (1 kilometer is equal to 1000 meters)

1 hour = 3600 seconds (1 hour is equal to 3600 seconds)

When two planets revolve around the sun, they do not necessarily do so in the same direction.  In the case of Venus, which is known for its retrograde rotation, if it were to revolve around the Sun in a direction that is opposite to Earth's revolution, it would still have a synodic period of 583.92 Earth days.

A synodic period refers to the time required for a celestial object to return to the same relative position as it had with respect to a reference point.In this case, the synodic period of Venus as seen from Earth would be:583.92 Earth days. This is due to the fact that the synodic period of two planets is calculated by finding the time between each opposition with the Sun.

An opposition happens when Earth is directly between Venus and the Sun. When the planets are at an opposition, the difference in the time it takes for them to complete one orbit is equal to the length of a synodic period.A retrograde orbit occurs when a planet or moon travels in the opposite direction from the rotation of its host body.  

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Knowing that an 8-mm-diameter hole has been drilled through each of the shafts AB,BC, and CD, Without specific details about the applied load, material properties, and shaft geometry, it is not possible to provide a conclusive answer regarding

To determine the shaft in which the maximum shearing stress occurs and the magnitude of that stress, we need additional information such as the applied load, material properties, and geometry of the shafts. Without these details, it is not possible to provide a specific answer. However, I can provide a general explanation of the concept. In general, the shearing stress in a shaft is related to the applied torque and the shaft's geometry. The shearing stress can be calculated using the formula:

τ = T * r / J

where τ is the shearing stress, T is the applied torque, r is the radius of the shaft, and J is the polar moment of inertia of the shaft.

The polar moment of inertia (J) depends on the shape and dimensions of the shaft. In the case of a solid circular shaft, J is equal to (π/32) * d^4, where d is the diameter of the shaft.

To determine the maximum shearing stress, we would need to compare the values of τ in each shaft by considering the applied torques and the shaft dimensions. The shaft with the highest shearing stress would have the maximum value.

Without specific details about the applied load, material properties, and shaft geometry, it is not possible to provide a conclusive answer regarding the shaft in which the maximum shearing stress occurs or the magnitude of that stress.

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When a wheel has eight spokes and radius and angular velocity is given then the minimum speed that the arrow must have is 3.87 m/sec.

A bar or rod that connects the center of a wheel to its rim is known as spoke. The main purpose of spokes is to support structure of the wheel.

Given: radius = 29.5cm  and angular velocity = 2.14 rev/sec

length of arrow = 22.5cm

Angle between spokes = 2π/8 = π/4

Time taken to reach adjacent spoke =Ф/ω

= π/4/ 2.15 (2π)

= 0.058 sec

For the arrow to pass through spokes, time should be less than 0.058 sec.

Then, minimum speed = 22.5/100/0.058

= 3.87 m/sec

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I only know the formula which is ω = 2πf

Answer:

The pressure value changes 400 % relative to the initial value.

Explanation:

Let suppose that the gas behaves ideally and represents a closed system, that is, a system with no mass interactions so that number of moles is conserved (\(n\)). Since the variables involved in the isothermal process are pressure (\(P\)) and volume (\(V\)). Finally, the process is represented by the following relationship:

\(P_{1}\cdot V_{1} = P_{2}\cdot V_{2}\) (1)

Where:

\(P_{1}, P_{2}\) - Initial and final pressures.

\(V_{1}, V_{2}\) - Initial and final volumes.

If we know that \(P_{1} = P_{o}\), \(V_{1} = V_{o}\) and \(V_{2} = 0.2\cdot V_{o}\), then the final pressure of the closed system is:

\(P_{2} = P_{1}\cdot \left(\frac{V_{1}}{V_{2}} \right)\)

\(P_{2} = 5\cdot P_{o}\)

The pressure value changes 400 % relative to the initial value.

13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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The rate at which temperature increases with depth in the Earth's crust is called the geothermal gradient, and it typically ranges from 25 to 30 degrees Celsius per kilometer.

Temperature is a measure of how hot or cold something is represented in terms of one of several scales, including Fahrenheit and Celsius. Temperature shows the direction in which heat energy will naturally flow—that is, from a hotter (higher) body to a colder body (one at a lower temperature). Temperature is defined as a measurement of an object's thermal energy. According to the International System of Units, the SI unit of temperature is Kelvin.

Here,

The rate at which temperature increases with depth in the Earth's crust is called the geothermal gradient, and it typically ranges from 25 to 30 degrees Celsius per kilometer in the upper crust, although this rate can vary depending on several factors, such as the location and the geological conditions. The geothermal gradient is an important factor that affects various geological processes, including volcanic activity, the formation of mineral deposits, and the generation of geothermal energy.

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To move a 40 kg crate by 10.1 mm across a rough floor horizontally without any acceleration mover have to do 2.74 J of work.

To calculate the work done by the movers in pushing the crate horizontally, we need to use the formula:

Work = Force x Distance x Cos(θ)

where:

Force is the horizontal force applied to the crate by the movers

Distance is the displacement of the crate in the horizontal direction

θ is the angle between the direction of the applied force and the displacement

In this case, since the crate is not accelerating, the horizontal force applied by the movers is equal in magnitude and opposite in direction to the force of friction between the crate and the floor. The force of friction is given by:

Friction force = coefficient of friction x Normal force

where:

The coefficient of friction is given as 0.70

The normal force is equal to the weight of the crate, which is given by:

Normal force = mg \(= (40.0\ kg) \times (9.81 \ m/s^2) = 392.4 N\)

Therefore, the friction force is:

\(Friction\ force = (0.70) \times (392.4\ N) = 274.7 \ N\)

Since the displacement of the crate is given as 10.1 mm = 0.0101 m and the angle between the direction of the applied force and the displacement is 0 degrees (cos(0) = 1), the work done by the movers is:

\(Work = (274.7 \ N) \times (0.0101 \ m) \times (1) = 2.74 \ J\)

Therefore, the movers did 2.74 J of work pushing the crate horizontally across the rough floor.

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The work done by the movers in pushing a 40.0 kg crate 10.1 m across a rough floor without acceleration is 282.7 J.

The calculation is based on the equation Work = Force × Distance , where Force is equal to the mass of the crate multiplied by the coefficient of friction. The effective coefficient of friction is 0.70, so the force is equal to 28 N. Multiplying this by the distance of 10.1 m, we get 282.7 J of work done.

Work is a measure of energy and is calculated by multiplying the force applied on an object by the distance it moves. In this case, the object is a 40.0 kg crate that is pushed 10.1 m across a rough floor without acceleration.

The force applied on the crate is equal to the mass of the crate multiplied by the coefficient of friction, which is 0.70 in this scenario.

Therefore, the force is equal to 28 N. When multiplied by the distance of 10.1 m, we get 282.7 J of work done by the movers. This amount of energy can be used to determine how much effort was required by the movers to move the crate.

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Answer:

Ok let me figure this out

Explanation:

#9 asks what is the relationship between distance and force?

The relationships between the two are of the following: if you have distance you woulnt have force, and if there was no force then there is no distance, the 2 countereact each other and balance the scale

The frequency of the third harmonic if the pipe is closed at one end is 62.18 Hz.

Given,

length of pipe = 4.137 m

v = 343 m/s

n = 3

Frequency of third hormonic is:

\(f_{3}\) = 3v/4L

= 3(343m/s)/4(4.137 m)

= 62.18 Hz

Hence, the frequency of the third harmonic if the pipe is closed at one end is 62.18 Hz.

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Answer:

y = 3.26 [m]

Explanation:

In order to solve this problem, we must use the following equation of kinematics.

\(v_{f}^{2}= v_{o}^{2}-2*g*y\)

where:

Vf = final velocity = 0

Vo = initial velocity = 8 [m/s]

g = gravity acceleration = 9.81 [m/s²]

y = elevation [m]

Note: The negative sign in the equation above represents that the movement is againts the direction of the gravity acceleration.

Now replacing:

\(0=8^{2} -2*9.81*y\\19.62*y=64\\y=3.26 [m]\)

Answer:

The type of reaction represented by the model is an;

Exothermic reaction

Explanation:

Exothermic reaction reaction is a reaction that involves the giving off of excess energy as heat and or light by two or more reactants during a chemical reaction due to the higher combined energy of the reactants compared with the product

The analogy are;

The sponge balls are the reacting atoms

The water is the energy which they contain

The water given off is the excess energy which the compound formed by putting together the two soaked sponge balls is unable to hold.

The dominant mechanism by which high-mass stars generate energy on the main sequence is called (d) the CNO cycle.

The CNO cycle, or the carbon-nitrogen-oxygen cycle, is a nuclear fusion process that occurs in the cores of high-mass stars. It involves the conversion of hydrogen into helium through a series of nuclear reactions mediated by carbon, nitrogen, and oxygen isotopes.

In the CNO cycle, carbon, nitrogen, and oxygen act as catalysts to facilitate the fusion of protons (hydrogen nuclei) into helium nuclei. This process releases a tremendous amount of energy in the form of gamma rays. The energy released powers the star and enables it to maintain its stability and luminosity on the main sequence.

The CNO cycle is more efficient than the proton-proton chain (option a) in high-mass stars due to their higher core temperatures. The proton-proton chain is the dominant energy generation mechanism in lower-mass stars like the Sun.

The carbon-carbon reaction (option b) and the triple-alpha process (option c) play significant roles in later stages of stellar evolution but are not the primary mechanisms for energy generation in high-mass stars. Neutrino cooling (option e) is not directly related to energy generation but is a process by which energy is lost from the star through the emission of neutrinos.

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