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The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

Electromagnetic radiation consists of waves of electromagnetic field, which propagates through space and carries momentum and electromagnetic radiant energy.

Minimum energy required to knock out an electron from the surface of the metal is called the work function.

As we know that, W= hc/λ

h -- Planck's constant ; c -- Speed of light

and λ is Longest wavelength

Given, work function of sodium metal is 2.28 eV

As 1 eV = 1.6021 * 10^-19 J

=2.28 * 1.6021 * 10^-19

= 3.65 *10^-19 J

W= hc/ λ

3.65 *10^-19 = 6.62 *10^-34 * 3 *10^8/ λ

λ = 5.44 * 10 ^-7m

λ =544 nm

The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

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The pair of protons with velocity 1000 km/s will get closer together before they repel each other.

To find the correct statement, we need to know about the motion of protons.

Thus, we can conclude that the pair of protons with velocity 1000 km/s will get closer together before they repel each other.

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Answer:            The ice molecules expand and  become stuck since the water is frozen and start to vibrate

Explanation:

According to the concept of thermal energy, as the temperature rises thermal energy increases and molecules start vibrating faster and ice changes it's state to water  that is from solid to liquid.

Thermal energy is defined as a type of energy which is contained within a system and is responsible for rise in temperature.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance containing  molecules or atoms are vibrating faster.

These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the  number of collision of particles , higher is the thermal energy.

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Answer:

it means it will become faster because more force are applied. This means that if you get pushed, the harder you are pushed, the faster you'll move (accelerate). The bigger you are, the slower you'll move.

hope this helps bby<3

The Mach number for the plane is approximately 3.51.

To find the speed of the plane, we can use the equation:

Speed of sound = Speed of the plane / Time taken

Given: Speed of sound (v) = 344 m/s

Time taken (t) = 3.51 seconds

Let's calculate the speed of the plane:

Speed of plane = Speed of sound × Time taken

Speed of plane =\(344 m/s * 3.51 s\)

Speed of plane ≈ 1206.44 m/s

Rounded to 2 decimal places, the speed of the plane is approximately 1206.44 m/s.

To find the Mach number of the plane, we need to divide the speed of the plane by the speed of sound:

Mach number = Speed of plane / Speed of sound

Mach number ≈ \(1206.44 m/s / 344 m/s\)

Mach number ≈ 3.51

Rounded to 2 decimal places, the Mach number for the plane is approximately 3.51.

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Answer:

Explanation:1.6 N

Explanation:

Weight, W = mg where m = mass = 0.16 kg and g = 10 N/kg

W = mg = 0.16 kg × 10 N/kg = 1.6 N

The weight of the cricket ball is 0.588 N.

Given data:

The mass of cricket ball is, m = 0.06 kg.

The weight of any object can be expressed as the product of mass and gravitational acceleration. Then the weight of cricket is given as,

W = mg

Here, g is the gravitational acceleration.

Solving as,

\(W = 0.06 \times 9.8\\\\W =0.588 \;\rm N\)

Thus, we can conclude that the weight of the cricket ball is 0.588 N.

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a ) The player's speed afterward if the ball is thrown at 14.5m/s relative to the ground = 1.87 m / s

b ) If the ball is thrown at 14.5m/s relative to the player, V = 1.86 m / s

a ) According to law of conservation of momentum,

Initial momentum = Final momentum

( 72 + 0.44 ) 1.95 = ( 0.44 * 14.5 ) + ( 72 V )

141.26 = 6.38 + 72 V

V = 134.88 / 72

V = 1.87 m / s

b ) Initial momentum = Final momentum

( 72 + 0.44 ) 1.95 = [ 0.44 ( 14.5 + 1.95 ) ] + 72 V

141.26 = 7.24 + 72 V

V = 134.02 / 72

V = 1.86 m / s

Therefore,

a ) V = 1.87 m / s

b ) V = 1.86 m / s

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A. Total momentum in a closed system is conserved

the law of momentum conservation states that The total amount of momentum before the collision is the same as the total momentum after the collision. Regardless of the change of momentum of each object.

Answer:

wavelength = (3×10^8 m/s)(6×10^5 Hz)

= 1.8×10^14 m

Answer:

117.6 m/s

Explanation:

The formula of free-falling velocity is:

\(\displaystyle{v = u + gt}\)

where u is initial velocity, g is gravitational force (defined to be 9.8 m/s^2) and t is time.

Since cantaloupe does not have initial velocity then u will equal to 0 which makes the equation to:

\(\displaystyle{v = gt}\)

Since cantaloupe is free-falling and has its direction or motion same as gravitational force. Therefore, g = 9.8 m/s^2 and t = 12:

\(\displaystyle{v = 9.8 \times 12}\\\\\displaystyle{v = 117.6 \ \, \sf{m/s}}\)

Since distance and displacement have same magnitude in this case with positive value then speed will equal to velocity in sign (positive/negative).

Hence, speed for free-falling cantaloupe after 12 seconds will be 117.6 m/s

Answer:

∆PE = 749.7 J

At 0.9 m high, PE = 793.8 J

At 1.75 m high, PE = 1543.5 J

The following equation may be used to determine heat loss via a glass window: Q = k * A / (T1 - T2) where Q denotes heat loss The thermal conductivity of glass.

(in W/m.K) is given by k. A denotes the window's surface area (in m2). T1 is the temperature of the inner surface (in degrees Celsius). T2 is the temperature of the outer surface (in degrees Celsius).The following equation may be used to determine heat loss via a glass window: Q = k * A / (T1 - T2) where Q denotes heat loss The thermal conductivity of glass.  The thickness of the glass is denoted by d. When we plug in the values, we get: Q = 1.4 * (1 * 3) * (15 - 5) / 0.005 Q = 1.4 * 3 * 10 / 0.005 Q = 1.4 * 600 / 0.005 Q = 840 / 0.005 Q = 168000 W As a result, the heat loss through a 1 m 3 m glass window with a 5 mm thickness and a temperature differential is 10 °C is equal to 168000 W.

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Fluid friction requires less force to overcome than sliding friction. Fluid friction is the resistance to an object's motion through a fluid, such as air or water.

This type of friction depends on the shape and size of the object, as well as the properties of the fluid, such as viscosity. In general,

with streamlined shapes experience less fluid friction than those with irregular shapes.

Sliding friction, on the other hand, is the force that opposes the motion of two surfaces sliding against each other. This type of friction is caused by the irregularities on the surfaces that come into contact,

which resist the motion of one surface over the other. Sliding friction is affected by the materials of the surfaces and the force pushing the surfaces together.

In terms of the force required to overcome these types of friction, fluid friction requires less force than sliding friction. This is because fluid friction depends on the object's shape and size,

and the properties of the fluid, while sliding friction is determined by the force pushing the surfaces together and the materials of the surfaces.

Therefore, if you were trying to move an object, it would require less force to overcome fluid friction than sliding friction.

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Answer:

If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.

Explanation:

We have that:

\( F = ma \)

From the equation above we see that the acceleration is directly proportional to the force, so hence if the force is doubled:

\( F_{1} = ma_{1} \)

\( 2F_{1} = ma_{2}  \rightarrow a_{2} = 2\frac{F_{1}}{m} = 2a_{1} \)  

Therefore, If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.

I hope it helps you!

The maximum height reached by the cricket ball is 20 meters, and its potential energy at that height is 288.7 Joules.

To calculate the maximum height reached by a cricket ball projected upwards with an initial velocity, we can use the following formula:

h = v0^2 / (2g),

where h is the maximum height, v0 is the initial velocity, and g is the acceleration due to gravity (9.8 m/s^2).

First, we need to convert the initial velocity from km/h to m/s:

v0 = 72 km/h x 1000 m/h / 3600 s/h

= 20 m/s

Then, we can use the formula to calculate the maximum height:

h = v0^2 / (2g)

= 20^2 / (2 x 9.8)

= 20^2 / 19.6 = 20^2 / 20

= 400 / 20 = 20 m

The potential energy of the cricket ball can be calculated using the formula:

PE = mgh,

where m is the mass of the cricket ball, g is the acceleration due to gravity, and h is the height.

PE = 160 g x 9.8 m/s^2 x 20 m

= 160 g x 9.8 x 20

= 3,072 g x 9.8

= 29984 g x 9.8

= 295,646.72 g

= 29.56 kg x 9.8 m/s^2

= 288.7 Joules

So the maximum height reached by the cricket ball is 20 meters, and its potential energy at that height is 288.7 Joules.

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Mixture is not a pure substance because it is made of more than one particle while a pure substance is made of one particle

Answer:

c. eco

ya que hay trasmisión de energía de un lado al hacer ecos

Answer:

22.1meter/min

Explanation:

Change 488s to min.

Speed= Distance÷Time

so 180m ÷ 122/15

= 22.1 (3s.f.) meter / min.

Answer:

light scattering by particles in a colloid or in a very fine suspension

Answer:

tyndall effect is light scattering by particles in a colloid or in a very fine suspension

These grasshopper-related insects generate massive swarms that travel across areas. Since the Pharaohs ruled ancient Egypt, plagues of locusts have destroyed societies and continue to cause devastation now.

Invertebrates (animals without a backbone) have a hard exterior covering called an exoskeleton. The head, thorax, and abdomen make up an insect's three-part body. The majority of mature insects also have wings, and they all have six legs. Insects come in more than a million different varieties.

Ants are the most common bug in the world, which should not be surprising. There are around 10,000 species of these colonial hymenopterans, with an estimated population size of 10–100 trillion individuals worldwide.

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Answer:

-12.38 N

Explanation:

This question requires you to first find the acceleration then apply Newton's 2nd law of motion to find the force.

To find deceleration use the formula;

v²= u²+2ad ---where

v= final speed = 0 m/s

u= initial speed = 3.0 m/s

a= acceleration { in this case , deceleration} = ?

d= distance from the point where its passenger rolled off= 4.0 m

therefore ;

\(a=\frac{v^2-u^2}{2d}\)

\(a=\frac{0^2-3^2}{2*4} =\frac{-9}{8} m/s^2\)

Mass of the sled is calculated from its weight force.

Weight force = mg

mass of sled = weight force / g  where g= 10 m/s²

mass of sled = 110/10 = 11kg

The magnitude of horizontal net force will be : F= ma  where ;

m= mass of sled = 11 kg

a= deceleration = -9/8 m/s²

F = 11 * -9/8 = -12.38 N

Force is acting on the opposite direction of the initial motion of the sled.

The magnitude of the horizontal net force acting on the sled is 12.375 N.

Given data:

The initial speed of sled is, u = 3.0 m/s.

The final speed of sled is, v = 0 m/s.

The distance covered before stopping is, s = 4.0 m.

The weight of sled is, W = 110 N.

Using the Newton's second law, the net horizontal force acting on the sled is given as,

F = ma

here,

m is the mass of sled.

a is the acceleration of sled.

Mass is calculated from the weight as,

W = mg

110 = m (10)

m = 11 kg.

Now, using the second kinematic equation of motion to obtain the acceleration of sled as,

\(v^{2}=u^{2}+2(-a)s\\\\0^{2}=3^{2}+2(-a)4\\\\8a=9\\\\a=1.125 \;\rm m/s^{2}\)

Then the magnitude of net horizontal force is,

\(F = ma\\\\F = 11 \times 1.125\\\\F = 12.375\;\rm N\)

Thus, we can conclude that the magnitude of the horizontal net force is 12.375 N.

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The denominator is 0, indicating that the final angular speed is undefined in this case. This means that it is not physically possible for the man to reach a point 0 m from the center without any change in the moment of inertia of the system.

To solve this problem, we can apply the principle of conservation of angular momentum. Initially, the angular momentum of the system is given by:

L_initial = I_initial * ω_initial

where L_initial is the initial angular momentum, I_initial is the initial moment of inertia, and ω_initial is the initial angular speed.

When the man walks to a point 0 m from the center, the moment of inertia of the system changes. The new angular momentum can be calculated using:

L_final = I_final * ω_final

where L_final is the final angular momentum, I_final is the final moment of inertia, and ω_final is the final angular speed.

Since angular momentum is conserved, we can equate the initial and final angular momenta:

L_initial = L_final

I_initial * ω_initial = I_final * ω_final

Now, let's calculate the initial and final moments of inertia:

For the initial moment of inertia (I_initial), the man is standing 2.2 m from the axis of rotation. Since the merry-go-round is modeled as a solid cylinder, the moment of inertia of a solid cylinder is given by:

I_initial = (1/2) * m * r^2

where m is the mass and r is the radius. Plugging in the values:

I_initial = (1/2) * 83 kg * (2.2 m)^2

I_initial = 162.86 kg·m^2

For the final moment of inertia (I_final), the man is at a point 0 m from the center. In this case, the moment of inertia can be calculated as:

I_final = m * r^2

Plugging in the values:

I_final = 83 kg * (0 m)^2

I_final = 0 kg·m^2

Now, let's solve for the final angular speed (ω_final):

I_initial * ω_initial = I_final * ω_final

162.86 kg·m^2 * (0.5 rev/s) = 0 kg·m^2 * ω_final

ω_final = (162.86 kg·m^2 * (0.5 rev/s)) / 0 kg·m^2

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The answer of the concave lens are:

A) Without specific diagrams provided, I cannot accurately determine which diagrams are accurate.

B)The object should be placed at a distance of approximately -2.476 cm from the concave lens.

C)The magnification produced by the concave lens is approximately 1.494.

d)The object should be moved closer to the concave lens to have a larger magnification.

What is concave lens?

A concave lens is a type of lens that is thinner at the center and thicker at the edges, causing light rays passing through it to diverge or spread out. It is also known as a diverging lens because it diverges the incoming parallel light rays.

A) Without specific diagrams provided, I cannot accurately determine which diagrams are accurate.

B) To find the distance at which an object should be placed from a concave lens to form an image at a specific distance, we can use the lens formula:

1/f = 1/v - 1/u,

where,

f = the focal length

v = the image distance,

u = the object distance.

Given that the focal length (f) of the concave lens is -7.50 cm and the image distance (v) is 3.70 cm, we can rearrange the lens formula to solve for u:

1/u = 1/f - 1/v.

we have:

1/u = 1/(-7.50 cm) - 1/(3.70 cm).

Calculating this expression, we find:

1/u = -0.1333 \(cm^{-1}\) - 0.2703 \(cm^{-1}\),

1/u = -0.4036 \(cm^{-1}\).

Taking the reciprocal of both sides, we get:

u = -2.476 cm.

Therefore, the object should be placed at a distance of approximately -2.476 cm (or 2.476 cm to the left) from the concave lens to form an image at a distance of 3.70 cm from the lens.

C) The magnification (m) produced by a lens is given by the formula:

m = -v/u,

where,

v= the image distance

u= the object distance.

we have:

m = -3.70 cm / (-2.476 cm),

m ≈ 1.494.

Therefore, the magnification produced by the concave lens described in Part B is approximately 1.494.

D) To achieve a larger magnification, the object should be moved closer to the concave lens. As the object distance (u) decreases, the magnification (m) increases.

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Answer:

35%

Explanation:

Given data

Amount of energy transferred (Input) = 270J

Amount of energy converted to sound (Output)=  94.5J

Efficiency = output/input*100

Efficiency= 94.5/270*100

Efficiency=0.35*100

Efficiency=35%

Hence the efficiency is 35%

Alcohol and Acetone

Water is a polar molecule that dissolves Alcohol, polar and charged amino acids, carbohydrates, salts, Acetone, ethylene glycol, etc.

In general, ionic substances dissolve best in polar solvents; the higher the lattice energy, the more polar the solvent must be to overcome it and dissolve the molecule.

The heat anticipator in a thermostat prevents the temperature in the conditioned space from rising above the thermostat setting. This statement is false.

A thermostat is a temperature-regulating device that maintains a constant temperature in a heating and cooling system. When the temperature reaches a certain level, the thermostat causes the system to turn on or off. It is an important part of an HVAC system since it helps maintain the temperature within a room or building.

The thermostat's heat anticipator is an electrical device that determines when to shut off the heating or cooling system before the set temperature is reached. It accomplishes this by adding a small amount of resistance to the thermostat's circuit, which results in a little current flowing through the heating element of the thermostat.

It reduces overshooting by turning off the heating or cooling system before it reaches the set temperature, ensuring that the space temperature does not go beyond the thermostat setting. So, in conclusion, the correct explanation is false because the heat anticipator helps to maintain the temperature from overshooting the thermostat setting.

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The current should the solenoid carry is 0.22A.

We need to know about the magnetic field of solenoids to solve this problem. The magnetic field appears when there is any current flowing through the solenoid. The magnitude of the magnetic field can be determined by

B = μ₀ . I . N / L

where B is the magnetic field, μ₀ is the vacuum permeability (4π x 10¯⁷ H/m), I is current, N is coil turns and L is the length of the solenoid.

From the question above, the parameters given are

L = 52.0 cm = 0.52 m

d = 1.35 cm

R = 0.0135/2 m

B = 0.375 mT = 0.000375 T

N = 705

By substituting the given parameters, we can calculate current

B = μ₀ . I . N / L

0.000375 = 4π x 10¯⁷ . I . 705 / 0.52

I = 0.22 A

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Answer:

Electronic tools provide more accurate data and this data is more efficient fast and easy to understand

Hope this helps you!!

Answer:

The  time taken is  \(t = 32.5 \ s\)

Explanation:

From the question we are told that

   The  speed  of  first car is  \(v_1 = 66.7 \ km/h = 18.3 \ m/s\)

    The  speed  of  second car is \(v_2 = 52.7 \ km/h = 14.64 \ m/s\)

   The  initial distance of separation is  \(d = 119 \ m\)

The distance covered by first car is mathematically represented as

     \(d_t = d_i + d_f\)

Here  \(d_i\) is the initial distance which is  0 m/s

  and  \(d_f\)  is the final distance covered which is  evaluated as \(d_f = v_1 * t\)

So

     \(d_t = 0 \ m/s + (v_1 * t )\)

     \(d_t = 0 \ m/s + (18.3 * t )\)

The distance covered by second  car is mathematically represented as

     \(d_t = d_i + d_f\)

Here  \(d_i\) is the initial distance which is  119 m

  and  \(d_f\)  is the final distance covered which is  evaluated as \(d_f = v_2* t\)

       \(d_t = 119 + 14.64 * t\)

Given that the two car are now in the same position we have that

    \(119 + 14.64 * t = 0 + (18.3 * t )\)

   \(t = 32.5 \ s\)

The term for the shearing along a tension crack line in the vertical face of a trench is known as a "trench cave-in" or "trench collapse."

This is a significant safety concern in the construction industry. Proper trench shoring and safety procedures are crucial to prevent such incidents, which can potentially lead to serious injuries or fatalities.

This happens when the soil is cohesive, and the force of gravity acting on the mass of soil is greater than the soil's internal resistance to sliding. The tension crack line is a critical weak point where this sliding can occur.

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