Light that has a 185 nm wavelength strikes a metal surface, and photoelectrons are produced moving as fast as 0.002c.
1) What is the work function of the metal? (Express your answer to three significant figures.)
2) What is the threshold wavelength for the metal above which no photoelectrons will be emitted?

Answer:

scsc

Explanation:

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Answer: 60mph

Explanation: He drives to Wisconsin and back so multiply both numbers by 2. Speed=distance divided by t

So 3840 divided by 64 is 60.

Period will change with respect to the changes in revolving mass.

Radial force simply means a force exerted in a radial direction towards or away from the center. When a body or fluid element with a mass moves along a circular path, an equilibrium establishes in the radial direction between the outwardly exerted centrifugal force (inertia force) and the inwardly exerted centripetal force (acceleration force).

F = mv²/r

F = Force required to keep the mass in a circle

m = mass

v = velocity of the mass

r = radius of the circle.

Since, v = 2πr/t

Where t = period

π = pie

Substitute the value of v

We have, F = m(2πr/t)²/r

F = 4π²r²m/t²r

F = 4π²rm/t²

If the path radius and radial force are kept constant then mass is directly proportional to period

m ∝ t

Which means if mass increases period will increase as well.

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The vector tangential to the circle because the vector indicates the direction of the force on the object.

Centripetal force is the force acting on an object in circular motion directed towards the axis of rotation.

In a circular motion, the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well.

It also indicate the direction of the centripetal force.

Thus, the vector tangential to the circle because the vector indicates the direction of the force on the object.

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Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This tendency to resist changes in a state of motion is inertia.

A force is an effect that can alter an object's motion according to physics. When a mass-containing object increases its velocity, such as when it travels away from rest, a force can cause it to accelerate. A push or a pull is a straightforward method to explain force.  

A force is a vector quantity since it has both magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F. (formerly P).

The net force acting on an object is equal to the rate at which its momentum changes over time, according to Newton's second law in its original formulation.

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Answer: Down below is the answer in complete sentences!

Explanation:

PART A:

Gravity and Acceleration are two additional forces acting upon the sled.

PART B:

Gravity will affect the sled by pulling it down, since the slope of the hill is negative.

Acceleration will affect the sled by gradually increasing it's speed, since the slope is downwards, which in addition to the initial force exerted plus gravity increases the speed, thus the sled accelerates.

The object D is made up of material Lead. The correct option is D.

The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.

Two 1-kg objects, C and D, increase in temperature by the same amount, but the thermal energy transfer of object C is greater than the thermal energy transfer of object D. The object C has a specific heat of 235 J/kg-K.

Q = m C ΔT

Qc > Qd

The energy transfer is proportional to specific heat.

Specific heat of D must be less. The possible material with specific heat less than the given value is for Lead material.

Thus, the correct option is D.

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compressed0.32 meters

Explanation

Step 1

The force exerted by a spring on objects attached to its ends is proportional to the spring's change in length away from its equilibrium length and is always directed towards its equilibrium position.

so

let

replace and solve for x

the negative symbol indicates the spring is compresed

so, the answer is

0.32 meters

I hope this helps you

An object's temperature plays a crucial role in determining the wavelengths of radiation it emits, and this relationship is described by Planck's Law.

The wavelengths of radiation that an object emits depend primarily on the object's temperature. This is because temperature determines the amount of energy an object has, and the wavelength of radiation is directly related to the amount of energy it possesses.

As an object's temperature increases, its atoms and molecules become more energetic and vibrate faster, which causes them to emit radiation with shorter wavelengths and higher energy. This is known as the Planck's Law, which states that the wavelength of maximum radiation emitted by an object is inversely proportional to its temperature.

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When we convert 4900mm from two-step dimensional analysis it would be 490 cm and 5.59kL to 5923.667 quarts.

Dimensional Analysis is a technique for analysis where physical quantities are expressed in terms of their basic dimensions and is frequently applied when there is insufficient data to create accurate equations.

As given in the problem we have to convert

4900mm to cm

As we know that there  are 1000 mm in 1 m

1000 mm = 1 m

4900 mm = 4.9 m

1 m = 100 cm

4.9 m = 4.9×100

          =490 cm

As we have to convert 5.59kL to quarts

1 Kiloliter =  1056.69 US liquid quart

5.59kL    = 5.59 ×1056.69 quarts

               =5923.667 quarts

Thus, we converted 4900mm to 490 cm and 5.59kL to 5923.667 quarts.

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Answer:

85 mph

Explanation:

Divide the distance by time

340/4 = 85 miles per hour

Answer:

85 mph

Explanation:

Speed = distance/time

Speed = 340/4

Speed = 85 mph

Answer:

50m/s2

Explanation:

u=0m/s

a=10m/s

v=?

t=5s

v=u+at

=0+(10×5)

=0+50

=50m/s

The telescope needs to have a distance of 102.50 cm between the objective and eyepiece lenses to produce a final image that is very far from the observer, where vision is most relaxed.

The angular magnification of a telescope is given by the ratio of the focal lengths of the objective and eyepiece lenses. In this case, the focal length of the objective is 100 cm and the focal length of the eyepiece is 2.50 cm, so the angular magnification is:

Magnification = (focal length of objective) / (focal length of eyepiece)
Magnification = 100 cm / 2.50 cm
Magnification = 40

To produce a final image that is very far from the observer, the distance between the objective and eyepiece lenses needs to be equal to the sum of their focal lengths. This is because the telescope acts as a simple magnifying glass, where the final image is formed at infinity. Therefore, the distance between the objective and eyepiece lenses is:

Distance = (focal length of objective) + (focal length of eyepiece)
Distance = 100 cm + 2.50 cm
Distance = 102.50 cm

So, the telescope needs to have a distance of 102.50 cm between the objective and eyepiece lenses to produce a final image that is very far from the observer, where vision is most relaxed.

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Answer:

The efficiency of a simple machine such as an inclined plane will decrease if the plane is made steeper. This is because a steeper plane requires more force to lift the same load, leading to a greater loss of energy due to friction and other sources of inefficiency. A gentler slope allows the force applied to the load to be spread out over a greater distance, reducing the force required to lift the load and therefore increasing the overall efficiency of the machine.

Explanation:

ALLEN

hm..

Explanation:

this would be quite hard to answer because no one has actually experienced the lab so maybe I can help better if you give more information on the lab you did:)

Answer: To figure the motion of the object or thing and the purpose i to learn off it

Explanation:

for 1.

The combined mass of the cessna plane and the passangers, with a potential energy of 800 J is 0.041 kg.

Mass can be defined as the quantity of matter a body contains.

To calculate the combined mass of the cessna plane and passangers, we use the formula below

Formula:

Where:

Make M the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the combined mass of the cessna plane and the passangers is 0.041 kg.

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The extension of the spring with a force of 2.0N and an extension of 0.30m, if the force applied is 6 N is 0.9 m

F = - k x

F = Force

k = Spring constant

x = Displacement

For 2 N force,

F = 2 N

x = 0.3 m

k = - F / x

k = - 2 / 0.3

k = - 6.67 N / m

For 6 N force,

F = 6 N

x = - F / k

x = - 6 / - 6.67

x = 0.9 m

Therefore, the extension of the spring is 0.9 m

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Answer:12

Explanation:

The correct option is D; The cart moved at a constant velocity of 0.5m/s for the entire 7 seconds.

Constant acceleration is represented as a horizontal line on the acceleration graph. The slope of the velocity graph represents the acceleration. On the velocity graph, constant acceleration Equals constant slope = straight line.

Acceleration is represented in a velocity-time graph by the slope, or steepness, of the graph line. If the line slopes upward, as seen in the figure between 0 and 4 seconds, velocity increases, and acceleration is positive. The velocity-time graph will be a curve when the acceleration increases with time, as anticipated by the equation: v = u + at.

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The first: 1,026m

The second: decreases

The third: 7.9 mya

hope i helped some :))

Answer: B. Objects are exposed to X-rays, which either pass through or are

absorbed by the objects.

C. A silicon chip releases electrons by the photoelectric effect,

producing an image.

Explanation:

Answer:

11

Explanation:

i've been in k12 and i got an a on this anser

An electromagnet is a magnet that is made up of winding wire around an iron core. When the current flows through the coil then that iron becomes a magnet.

The electric current is measured with an ammeter,

Test the strength of the electromagnet by seeing how many paper clips it can pick up.

Increasing the coil and electric current will change the strength of an electromagnet.

Electromagnet:

An electromagnet is a magnet that is made up of winding wire around an iron core. When the current flows through the coil then that iron becomes a magnet but when the current supply is turned off so it will lose its magnetic properties.

The electric cutting edge in one part of a circuit is measured with an ammeter, which gives an analysis of the ampere. To take the measurement, an opening is made in the circuit and the ammeter is connected to that hole so that the charged debris moving across the circuit needs to bypass the meter.

Strength of electromagnet:

1. Test the strength of the electromagnet by seeing how many paper clips it can pick up.

2. Record the number of paper clips on the worksheet.

3. Disconnect the wire from the battery after testing the electromagnet.

4. Test how varying the design of the electromagnet affects its strength.

Change the strength of the electromagnet:

You can make an electromagnet more potent by doing this stuff: wrapping the coil around a bit of iron (inclusive of an iron nail) and adding extra turns to the coil. growing the contemporary flowing through the coil.

So we can conclude that a magnet that is made up of winding wire around an iron core is called an electromagnet.

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The purpose of the experiment is to describe how the plasma membrane contributes to how the cell functions.

The dependent variable is the variable bring investigated. In this case, the dependent variable is the egg circumference.

The independent variable is the variable controlled by the researcher.

The controlled variable has no influence on the results. An example is the concentration of vinegar.

A hypothesis is a proposition which can be tested by observations. In order to form a hypothesis, it's important to collect observations about the problem being examined.

The tools that can be used to collect data include observations and records taken.

The procedure to collect the data include:

The conclusions that can be drawn about how the sum of forces acting on an object affect its motion is that when the forces cancel out, then the resultant force will be zero, if not, the unbalanced force will result in the acceleration of the object.

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The magnitude of the gravitational field on the planet's surface is approximately 45.88 N/kg.

The magnitude of the gravitational field, g, on the planet's surface can be calculated using the equation:

g = G * (m / r^2)

where G is the gravitational constant (approximately 6.67430 x 10^-11 N m^2/kg^2), m is the mass of the planet, and r is the radius of the planet.

In this case, the mass of the planet is given as 3.10 x 10^24 kg, and the radius is given as 2.00 x 10^6 m.

Substituting these values into the equation, we get:

g = (6.67430 x 10^-11 N m^2/kg^2) * (3.10 x 10^24 kg) / (2.00 x 10^6 m)^2

Simplifying this calculation, we have:

g = 4.588 x 10^1 N/kg

Therefore, the magnitude of the gravitational field on the planet's surface is approximately 45.88 N/kg.

To understand the meaning of this value, we can say that for every kilogram of mass on the planet's surface, there is a gravitational force of 45.88 Newtons acting on it.

This force pulls objects towards the center of the planet. The larger the gravitational field, the stronger the force of gravity experienced.

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No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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a) The motion of the object between 15 s to 30 s is increasing velocity, to a constant velocity and finally a decreasing velocity.

(b) The average velocity of the object between 0 and 15 seconds is 0.167 m/s.

(c) The position of the object at 5.0 seconds is 0.5 m.

(d) Between 30 and 40 seconds, the velocity of the object is decreasing and the object is decelerating.

(a) The motion of the object between 15 s to 30 s can be described as increasing velocity, to a constant velocity and finally a decreasing velocity.

(b) The average velocity of the object between 0 and 15 seconds is calculated as;

average velocity = total displacement / total time

average velocity = (2.5 m - 0 m ) / ( 15 s - 0 s ) = 0.167 m/s

(c) The position of the object at 5.0 seconds is calculated as follows;

at 5.0 seconds, the position of the object is traced from the graph as 0.5 m.

(d) The motion of the object between 30 and 40 seconds is calculated as;

velocity = ( 0 m - 4 m ) / ( 40 s - 30 s ) = - 0.4 m/s

Between 30 and 40 seconds, the velocity of the object is decreasing and the object is decelerating.

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Answer:

its can

Explanation:

i hope this helps

Answer:

Explanation:

The gravitational force between two objects becomes weaker if the two objects are moved apart and stronger if they are brought closer together; that is, the force depends on the distance between the objects.

The gravitational force between two objects as the bodies become closer to each other increases.

Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,

F ∝ m₁.m₂

F ∝ 1/r²

F = G m₁,m₂÷r²

where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².

Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].

As distance decreases the Force increases

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Answer:

A trees food and air source would be deprived because of this. Trees need leaves to perform photosynthesis, so besides their roots soaking up water and nutrients, they wouldn't have any other form of food until those leaves grow back. If they don't and the locusts continue to eat up the tree, it will eventually starve and die.

Explanation:

Imagine the trees trunk and roots as your body and the leaves as your mouth/food source. God Forbid you catch a cold or some sickness. You probably won't have the appetite to eat. Despite that, you'll still have to. But, if you get so sick to the point that eating just makes you throw it up before your body can take in the nutrients and beneficial stuff, you will eventually get to the point where eating is nearly impossible. This will lead up to the sickness taking over your body, as there's no energy going in to help it fight it off, and you would die.

(Gah, sorry for the dark theme... didn't think it would turn like that lol)

Anyways, hope this helped!

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