5. In order to free electrons from nickel whose work function is 5.22 eV, what threshold frequency of light is needed? [K3]

Answer:

Source:

Answer:

the time taken for the box to stop is 3.6 s.

Explanation:

Given;

initial speed with which the box was pushed, u = 5 m/s

time taken for the box to stop, t = 1.5 s

Assuming the box is moving at constant acceleration, a;

\(a = \frac{u}{t} \\\\a = \frac{5}{1.5} \\\\a = 3.33 \ m/s\)

When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;

\(t = \frac{v}{a} \\\\t = \frac{12}{3.33} \\\\t = 3.6 \ s\)

Therefore, the time taken for the box to stop is 3.6 s.

The pressure in the gas at that point is equal to the initial pressure, 100 kPa.

To expand adiabatically, there must be no heat transfer involved. Adiabatic expansion means that no heat is transferred between the gas and its surroundings; this means that if we double the volume of our gas, nothing should change in terms of temperature as long as there is no heat transfer to or from our system during expansion.

Since we're starting out with a monatomic ideal gas, we know that its entropy is going to stay constant throughout this process, so the ideal gas law gives us a relationship between pressure, volume, and temperature: PV = nRT

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Given our understanding of physics, we can conclude that once the balloon is pushed under the surface, it will sink.

One key factor to take into account here is to remember that the density of a ballon can change when exposed to a higher pressure. This is due to the elastic nature of the material that makes up the ballon, and the nature of gas atoms that allow them to be compressed.

Therefore, when the balloon is pushed underwater, the surrounding water will squeeze the balloon, thus incrementing its density. Once the density of the balloon rises, this, in addition to the weight to which it is attached, will make it heavier than the water it is in, and the balloon will sink.

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Answer: wrong (kind of)

Explanation:

for a), the number of hydrogens are not balanced, and the type is a combustion

b is right

Answer:

c

Explanation:

Answer:

I wanna say C

Explanation:

because A would be getting it nowhere and B would just take more time but when you use C it would be the greatest force.

boat velocity relative to the ground is = 11.18 Km/h.

Full solution in pic.

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Answer:

Decelaration is \(13.94m/s^2\)

Time is 4.3 seconds

Explanation:

Given

\(u = 60km/hr\) --- Initial Velocity

\(s = 10m\) --- Distance to stop

\(v = 0km/hr\) -- Final Velocity

Required

Determine the deceleration (a) and time taken (t)

The deceleration is solved using the following Newton equation of motion

\(v^2 = u^2 + 2as\)

Convert velocity to m/s

\(u = 60km/hr\)

\(u = \frac{50 * 1000}{3600} m/s\)

\(u = 16.7\ m/s\)

\(v^2 = u^2 + 2as\) becomes

\(0^2 = 16.7^2 + 2 * a * 10\)

\(0 = 278.89+ 20 a\)

Collect Like Terms

\(-20a = 278.89\)

Make a the subject

\(a = -\frac{278.89}{20}\)

\(a = -13.94m/s^2\)

The negative sign shows deceleration.

Hence, the decelaration is \(13.94m/s^2\)

Solving time (t): Using first law of motion

\(v = u + at\)

Substitute values for v, u and a

\(0 = 60 -13.94 * t\)

\(0 = 60 -13.94t\)

Collect Like Terms

\(13.94t = 60\)

Solve for t

\(t = \frac{60}{13.94}\)

\(t = 4.3s\)

The thickness of the air column above 1 m² of the Earth's surface that would have a weight of about 100,000 N is equal to 8,680.56 meters assuming the density of air remained constant at 1.2 kg/m³.

If the density of air were a constant 1.2 kg/m³ throughout the atmosphere, we can calculate the thickness of the air column that would have a weight of about 100,000 N on an area of 1 m².

The weight of the air column can be calculated using the formula:

Weight = density × volume × gravitational acceleration

We can rearrange the formula to solve for the volume:

\(\text{{Volume}} = \frac{{\text{{Weight}}}}{{\text{{density}} \times \text{{gravitational acceleration}}}}\)

Substituting the given values:

Weight = 100,000 N

Density = 1.2 kg/m³

Gravitational acceleration (g) ≈ 9.8 m/s²

\(Volume = \frac{100000 N}{(1.2 kg/m^3) \times (9.8 m/s^2)}\)

Volume ≈ 8,680.56 m³

Therefore, if the density of air were a constant 1.2 kg/m³, the thickness of the air column above 1 m² of the Earth's surface that would have a weight of about 100,000 N is approximately 8,680.56 meters.

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The required magnitude of the force that stopped Melissa's car is 118608.7 N.

According to the first law, unless a force acts on an object, it will not alter its motion. According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects interact, they exert equal-sized and opposite-direction forces upon one another.

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Given,

speed=8.133 m/s

final velocity=0 (due to impact)

time=0.3994 seconds

distance=11.01m

Then,

S = ut + (at^2)/2

a = 2(s - ut)t^2

a = 97.3 m/s^2

So,

Force = ma

Force = 1219(97.3)

Force = 118608.7 N

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Answer:

177.87

Explanation:

acellus

The potential difference between the points A and B is 177.9 V.

Potential difference between any two points is the amount of work required to move a unit positive charge along any path from point A to point B without accelerating is referred to as the electric field.

Here,

The charge on the particle, q = +0.00235 C

The change in electric potential energy, ΔU = 0.418 J

The potential difference can be defined as the electric potential energy per unit charge.

Therefore, the potential difference between A and B,

V = ΔU/q

V = 0.418/0.00235

V = 177.9 Volt

Hence,

The potential difference between the points A and B is 177.9 V.

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Answer:

a) 1.257 mT
b) 0.6283 J

Explanation:

When the binary number 01100100 is applied to the 8-bit D/A converter, the output voltage is approximately 1.788 V.

The given problem involves an 8-bit D/A converter, which stands for digital-to-analog converter. This type of converter takes a digital input and converts it into an analog output voltage. In this case, we are given the binary input values and their corresponding output voltages. When the binary number 01100100 is applied to the 8-bit D/A converter, the output voltage is approximately 1.788 V.

Let's analyze the given information step by step:
1. We are told that when the straight binary number 10110011 is applied to the 8-bit D/A converter, the output voltage is 3.58 V.
2. The binary number 10110011 can be broken down into its decimal equivalent by multiplying each bit by its corresponding power of 2 and summing the results.
  For example:
  - The leftmost bit has a weight of 2^7 = 128.
  - The second bit has a weight of 2^6 = 64.
  - The third bit has a weight of 2^5 = 32.
  - And so on...

  By performing the calculations and summing the results, we find that the decimal equivalent of 10110011 is 179.

3. Now, we are asked to determine the output voltage when the binary number 01100100 is applied.
  Following the same process as before, we calculate the decimal equivalent of 01100100:
  - The leftmost bit has a weight of 2^6 = 64.
  - The second bit has a weight of 2^5 = 32.
  - The third bit has a weight of 2^2 = 4.
  - And so on...

  By performing the calculations and summing the results, we find that the decimal equivalent of 01100100 is 100.

4. Finally, we need to calculate the output voltage corresponding to the decimal value of 100.
Since the output voltage is directly proportional to the decimal value applied to the D/A converter, we can use the ratio between the output voltages and the decimal values to find the desired output voltage.

Let's set up a proportion:

(Output voltage 1) / (Decimal value 1) = (Output voltage 2) / (Decimal value 2)

Using the given information:

3.58 V / 179 = (Output voltage 2) / 100

Now, we can solve for the unknown value, which is the output voltage when the binary number 01100100 is applied:

(Output voltage 2) = (3.58 V / 179) * 100

Calculating the above expression, we find:

(Output voltage 2) ≈ 1.788 V

Therefore, when the binary number 01100100 is applied to the 8-bit D/A converter, the output voltage is approximately 1.788 V.

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The range of colors that our eyes can perceive is determined by the specific range of wavelengths that our eyes are able to detect, while the energy absorbed by colored solutions is directly related to the wavelength of light that the solution absorbs.

Based on the wavelength measurements for each color and the energy calculations, we can conclude that the colors that our eyes can perceive are determined by the specific range of wavelengths that our eyes are able to detect.

This range is typically between 400-700 nanometers, which corresponds to the colors of the visible spectrum (red, orange, yellow, green, blue, indigo, and violet).

The energy absorbed by colored solutions is directly related to the wavelength of light that the solution absorbs.

Shorter wavelengths, such as blue and violet, have higher energy than longer wavelengths, such as red and orange. Therefore, solutions that appear blue or violet to our eyes absorb more energy than solutions that appear red or orange.

In summary, the colors that our eyes can perceive are determined by the specific range of wavelengths that we are able to detect, while the energy absorbed by colored solutions is directly related to the wavelength of light that the solution absorbs.

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Answer:

Equal effort force

Explanation:

A class 1 lever has the support between the load and the effort hence the load tilts the plain at one end containing the support we would require an effort equal and opposite to the load to ensure movement .

Answer: Your using your skeletal muscle

Explanation:

In the situation shown, if the cannon fires a banana aimed underneath the monkey at the same time that the monkey falls from the tree, the banana will fly below the monkey and miss.

In the presence of gravity, the banana will move in a parabolic path. As the monkey lets go of the tree, it will have a downwards acceleration due to the presence of gravity. But both the banana and the monkey will have the same amount of acceleration. Because gravity causes objects to accelerate at the same rate independent of their mass.

Since both the banana and the monkey experienced the same acceleration, both will fall equal amounts of distance below their gravity-free path. So the banana misses the monkey, moving below the monkey. The only way the banana hits the monkey is that if the cannon is aimed at the monkey.

Therefore, if the cannon fires a banana aimed underneath the monkey at the same time that the monkey falls from the tree, the banana will fly below the monkey and miss.

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At the instant shown, the six scenarios can be ranked in terms of the magnitude of current in the light bulb as follows:

1) Scenario 1 - Here, the battery is directly connected to the light bulb without any other resistors in the circuit. Therefore, the current flowing through the bulb will be the maximum among all the scenarios.

2) Scenario 3 - In this case, the battery is connected to the light bulb through a resistor. However, the resistance is less compared to other scenarios, so the current will be higher than in other cases.

3) Scenario 4 - Here, the battery is connected to the light bulb through a higher resistance compared to scenario 3. This will result in a lesser current in the bulb.

4) Scenario 5 - In this scenario, the battery is connected to the light bulb through a much higher resistance than in the previous two scenarios. Therefore, the current flowing through the bulb will be lower.

5) Scenario 6 - Here, the battery is connected to the circuit in such a way that the current will bypass the light bulb. Therefore, the bulb will not light up and the current flowing through it will be zero.

6) Scenario 2 - This scenario is similar to scenario 6 where the switch is open, so the circuit is not complete, and hence there will be no current flowing through the light bulb.

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The Big Bang is still visible today due to the Cosmic Microwave Background (CMB) radiation, which is a form of electromagnetic radiation left over from the Big Bang.

This radiation was detected in the 1960s by two American astronomers, Arno Penzias and Robert Wilson. Due to its low intensity, the CMB was only detectable with the help of very sensitive radio telescopes.

The CMB radiation has an extremely uniform temperature of about 2.7 degrees above absolute zero, and it has a slight variations in temperature across the sky, which provides evidence of the Big Bang.

These variations are thought to be the seeds of the galaxies and other cosmic structures that form the universe today.

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F min=61.25N Ahmed is supporting a 12.5 kg, 4.00 m long board on one end. Judi responds to his request for assistance by accelerating the speed of the motion, and is the rate for which velocity varies over time.

acceleration is the rate of change in both speed and the direction of velocity over time. When anything moves faster or slower in a straight line, it is said to have been accelerated. So because direction is constantly changing, even motion on the a circle accelerates at a constant pace.

This means that a velocity change can be either an alteration in the speed or direction of motion of an object. Acceleration is the process by which an item alters its direction, speed, or both.

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the answer for 0.429m to mm is 429

Answer:

0.429m=429 mm

Explanation:

Since there are 1,000 millimeters per meter, you need to multiply by 1,000 to convert from meters to millimeters.

The beginning of solar system development is most likely indicated by the big bang theory. An explanation for how the universe grew from a high density starting state is provided by the Big Bang theory.

And temperature. The evolution of the observable universe from the earliest known times through its later large-scale form is explained by a variety of cosmological models of the Big Bang theory. The Sun and the things that circle it make up the solar system, which is gravitationally bound. The gravitational collapse of a massive interstellar molecular cloud gave it birth 4.6 billion years ago. 99.86% of the system's mass is in the Sun, with the planet holding the majority of the remaining mass.

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The nebular hypothesis is the most widely recognized cosmogony theory to explain how the Solar System started and evolved (as well as other planetary systems). It implies that gas and dust orbiting the Sun are what created the Solar System.

Over 70 different types of meteorites have undergone radiometric dating to ascertain their ages. The findings suggest that between 4.53 and 4.58 billion years ago, the Solar System and meteorites both began to develop.

Scientists believe that the formation of terrestrial planets like Earth several billion years ago resulted from the coalescence of hot blobs of molten rock and metal from dust and gas. Before they developed into separate planets, they went through four stages of development: differentiation, cratering, flooding, and surface evolution.

The solar nebula

4.6 billion years ago, the solar nebula, a cloud of gas and dust, gave rise to the Sun and the planets.

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In a system where the linear momentum is conserved, the correct statement among the options provided is E: The vector sum of the average external forces acting on the system is equal to zero newtons.

This means that the total momentum of the system remains constant when only considering the external forces acting on it. The other options (A, B, C, and D) do not accurately describe a system with conserved linear momentum.

Linear momentum is a vector quantity that depends on both the mass and velocity of an object. If the linear momentum of a system is conserved, it means that the total momentum of the system remains constant over time.

This conservation of momentum can occur in the absence of external forces or when external forces balance each other out. Option A states that the vector sum of any internal forces within the system results in an acceleration of one or more objects within the system.

This statement is not necessarily correct for a system with conserved linear momentum. Internal forces can still exist within the system, but their vector sum does not necessarily result in acceleration. The key factor is that the total momentum of the system remains constant.

Option B suggests that the vector sum of the momentum of the objects in the system is equal to zero kg·m/s. However, in a system with conserved momentum, the total momentum does not necessarily equal zero. It remains constant, but its value can be non-zero.

Option C states that no internal or external forces are acting on the objects within the system. This is not necessarily true, as internal and external forces can still exist in a system with conserved momentum.

The crucial aspect is that the vector sum of the average external forces acting on the system is zero. Option D mentions the principle of the conservation of mechanical energy, which is not directly related to the conservation of linear momentum.

Conservation of mechanical energy applies to systems where no net external work is done on the system, but it does not automatically apply to systems with conserved linear momentum. Option E correctly states that the vector sum of the average external forces acting on the system is equal to zero newtons.

This implies that the total momentum of the system remains constant when considering only the external forces acting on it. Internal forces may still exist within the system, but their effects cancel out on average, leading to the conservation of linear momentum.

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Answer:

B

;)

Explanation:

Answer:

B - 32.52

Explanation:

Hope this Helps!

:)