Final answer:
The energy required to eject photoelectrons from the surface can be found using the equation E = hf, where E is the energy and f is the frequency. Substituting the given values, the energy required is 5.30 x 10^-19 J.
Explanation:
Energy required to eject photoelectrons from the surface
Max speed of photoelectrons = 7.0 x 10^5 m/s
Frequency of light = 8.00 x 10^14 Hz
The energy required to eject photoelectrons can be found using the equation:
E = hf
Where E is the energy, h is Planck's constant (6.626 x 10^-34 J.s), and f is the frequency.
Substituting the values:
E = (6.626 x 10^-34 J.s)(8.00 x 10^14 Hz) = 5.30 x 10^-19 J
The energy required to eject photoelectrons from the surface is 5.30 x 10^-19 J.
Please help me
The pitch of a sound is determined by its wavelength and speed together, or its ______ alone.
Answer:
Speed
Explanation:
Answer:
frequency
Explanation:
On an amusement park ride passengers accelerate straight downward from rest to 22.9 m/s in 2.2 s.
What is the average acceleration of the passengers on this ride?
Given,
Initial Velocity (u) = 0 m/s
Final Velocity (v) = 25.9 m/s
Time (t) = 2.5 sec
avg. acceleration = ?
avg. acceleration = v-u/t
avg = 25.9/2.5 = 10.36 m/s²
avg = 10.36 m/s²
Answer:
Acceleration, [tex]a=10.4\ m/s^2[/tex]
Explanation:
Given that,
Initial velocity of the ride, u = 0 (at rest)
Final speed of the ride, v = 22.9 m/s
Time taken, t = 2.2 s
Let a is the acceleration of the passengers on this ride. It can be calculated using the formula of the acceleration as :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{22.9-0}{2.2}[/tex]
[tex]a=10.4\ m/s^2[/tex]
So, the time required to bring the car to a stop is [tex]10.4\ m/s^2[/tex]. Hence, this is the required solution.
The tip of the fan blade is 0.61 m from the center of the fan. The fan turns at a constant speed and completes 2 rotation every 1.0s
Answer:
What is the centripetal acceleration of the tip of the fan blade?
6.0 m/s2
48 m/s2
53 m/s2
96 m/s2
Answer is 96
Explanation:
Answer:
d
Explanation:
Write a hypothesis about how the mass of a cart affects the acceleration of the cart. Use the "if . . . then . . . because . . .” format and be sure to answer the lesson question: "How do force and mass affect the acceleration of an object?”
edge sample response for lab :
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
If the mass of the cart is increased, then the acceleration of the cart is decreased and vice versa
The mass of a cart is inversely proportional to the acceleration of the cart. Inverse proportionality means that increase in one quantity leads to decrease in the other quantity.
Hence, if the mass of the cart is increased, the acceleration of the cart increases and if the mass of the cart is decreased, the acceleration of the cart is increased.
The force applied to an object is directly proportional to the acceleration given to the object when the mass of the object is kept constant. F= ma
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Because water molecules are polar and carbon dioxide molecules are nonpolar, Question 9 options: water has a lower boiling point than carbon dioxide does. carbon dioxide cannot exist as a solid. attractions between water molecules are weaker than attractions between carbon dioxide molecules. water has a higher boiling point than carbon dioxide does.
Answer:
The correct answer is: Water has a higher boiling point than carbon dioxide does.
Explanation:
Ok, because water is a polar molecule and its bonds are hydrogen bonds, this causes its boiling point to be higher than that of carbon dioxide, since hydrogen bonding is more resistant to rupture (in this case when heating), on the other hand carbon dioxide has convalent bonds, which are weaker. Therefore, the water will have a boiling point higher than that of carbon dioxide, since it costs more to break its polar bonds. This will also be true for any molecule that has hydrogen bonding links and is polar.
What does Newton’s law of universal gravitation say about the distance between objects?
It says: The bigger the distance between objects the smaller the gravity between them.
Anyone who answers this correctly, i will mark as brainiest.
Constructive interference results in a wave with a ____ amplitude than any of the component waves.
Answer:Constructive interference results in a wave with a greater amplitude than any of the component waves.
Explanation:
Aaron created the chart to list the benefits and limitations of using synthetic polymers . In which row has Aaron made an error in his chart?
Answer:
Its B trust me
Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2 Aaron made an error in his chart.
What is meant by Synthetic polymers?Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based.Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2 Aaron made an error in his chart.
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In any energy transformation, energy is _____.
Answer:
In any energy transformation, energy is the change of energy from one form to another.
In any energy transformation, energy is Conduction.
The conversion of one form of energy into every other, or the motion of electricity from one location to every other. A strength transformation is the change of strength from one shape to any other. The cloth that doesn't conduct warmness, electricity, light, or sound. electricity or pressure an object has because of its motion.
Conduction is the system via which warmness electricity is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more with ease in solids and drinks, in which the particles are closer collectively than in gases, in which debris are similarly apart.
While electricity is transferred from one part of a machine to every other?Conduction is the switch of power from one molecule to another by direct contact. This switch happens when molecules hit each differently, much like a game of pool where one moving ball strikes the other, causing the second to move.
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HURRY!!!
The graph shows the population of gray fox in an area of the United States.
Which best describes the population size between 1990 and 2011?
mostly stable and unchanged
many increases and decreases but declined overall
slowly increased over time
several sharp declines but grew overall
many increases and decreases but declined overall
Answer:
According to the graph, the population size of gray fox in the United States from 1990 to 2011 had many increases and decreases but declined overall.
Explanation:
The gray fox is a species of carnivorous mammal of the Canidae family distributed by the American continent, from the south of Canada to Venezuela.
Gray foxes are occasional hunting targets, mainly for the use of their fur, but also for illicit pet trade purposes. Although gray foxes are hunted, it is not as common as in other types of foxes, since the degree of their coats is perceived as inferior in quality. Several thousand gray foxes are caught for fur acquisition each year, notes the Minnesota Department of Natural Resources.
Which of the following statements about gravitational potential energy is not true?
A.Its magnitude is related to the work done by lifting an object.
B It depends on the choice of a coordinate system.
C. It is equal to the force required to move an object times the distance it is moved.
D.It is equal to the kinetic energy of the falling object at y = 0.
Answer:
B and D
Explanation
Gravitational potential energy does not relate to graphs and it is about a moving object so b and d would not be correct
The option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
The force needed to move an object multiplied by the distance traveled is not a direct equation for the gravitational potential energy. The position or height of an object within a gravitational field, rather than the force used to move it, determines the gravitational potential energy.
Gravitational potential energy is directly related to the work involved in lifting an object against the force of gravity, and its size is inversely proportional to the work involved in lifting an object. The change in potential energy is equal to the quantity of work that is completed.
It depends on the coordinate system chosen: The choice of a reference point or a location with zero potential energy in a selected coordinate system determines the gravitational potential energy. Usually, this reference point is placed at a suitable area, like the Earth's surface.
It is equivalent to the falling object's kinetic energy at y = 0: As an item descends to a reference point where its potential energy is zero, gravitational potential energy can be totally converted to kinetic energy. According to the principle of energy conservation, the potential energy is completely transformed into kinetic energy at that point (y = 0).
Hence, the option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
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An atom contains 15 neutrons and has a mass number of 30. What is its atomic number? How did you determine the atomic number?
Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.
The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.
This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.
A student drew this diagram of Woese’s modern system of classification.
DOMAIN
KINGDOM
PHYLUM
ORDER
CLASS
FAMILY
GENUS
SPECIES
What is the error in this diagram?
The top level is missing.
The class and order levels are switched.
The bottom level is missing.
The kingdom and family levels are switched.
Answer:
The class and order levels are switched
Explanation:
Woese's classification starts with a division in three parts of all the organisms, which is their domain, so according to him there's Bacteria, Archaea, and Eukaryota. After the domain we have the kingdom, then phylum, class, order, family, genus, and species at the end.
We can take the leopard as an example:
Domain - Eukaryota
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order - Carnivora
Family - Felidae
Genus - Panthera
Species - Panthera pardus
what is meniscus in Physics?
The curve at the liquid's surface by which you measure the volume of a liquid.
What is the difference between chemical change and a physical change?
Answer:
chemical change through chemical process .
physical change means change in dimension.
A chemical change involves a change in the substance's composition, creating new substances with different properties, typically through reactions such as rusting or combustion. In contrast, a physical change alters a substance's form without affecting its composition, as in melting or condensation processes. The processes can also be classified as exothermic (releasing heat) or endothermic (absorbing heat).
Explanation:The difference between a chemical change and a physical change pertains to the composition of the substance in question. A chemical change always results in the production of a new substance with different properties from the original matter. For example, the formation of rust from iron, or the combustion process in burning, are chemical changes. These result in the creation of substances distinct from the original matter.
On the other hand, physical changes do not affect the composition of the substance, but alter its state or form, such as the melting of ice into water or the condensation of steam into liquid water. These changes, while observable, do not produce new substances, hence maintaining the original properties of the matter.
Physical and chemical changes can also be differentiated based on whether they release or absorb heat, with exothermic processes releasing heat and endothermic processes absorbing heat. For example, the burning of a fuel is an exothermic process, while the operation of a cold pack is an endothermic process.
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how is energy can be changed from one state to another?
Answer:
Explanation:
Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point.They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance. EXAMPLE: Solid ice melting into liquid
Why does a hot air balloon rise?
A. The weight of the air displaced by the balloon is less than the volume of the balloon.
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
C. The volume of the air displaced by the balloon is less than the volume of the balloon.
Answer:
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:
Hot air balloons rise because of buoyancy (The force that cause objects to rise in the air). In order for the balloon to float, in needs to be lighter (less dense) than the surrounding air. By adding lighter hot air, It's causes the balloon to have less weight that the air it displaces.
Answer:B.
The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:gradpoint
When talking on a phone, the voice is transformed into electrical energy. This energy passes over wires or is transmitted through the air. Into what kind of energy does the speaker in the phone on the other end change the electrical energy?
Answer:
sound energy
Explanation:
Answer:
sound energy perriod
A group of organisms that is able to interbreed is called a
a. kingdom
b. family
c. class
d. species
Answer:
D species
Explanation:
According to the most widely used species definition, the biological species concept, a species is a group of organisms that can potentially interbreed, or mate, with one another to produce viable, fertile offspring. In this definition, members of the same species must have the potential to interbreed.
A house painter uses the chair-and-pulley arrangement of (Figure 1) to lift himself up the side of a house. The painter's mass is 55 kg and the chair's mass is 10 kg .
If the painter is at rest, what is the tension in the rope?
Answer:
Explanation:
Draw a free body diagram for the painter. There are three forces acting on him. The tension in the rope pulling him up, the normal force of the chair pushing him up, and gravity pulling him down.
Apply Newton's second law:
∑F = ma
T + N - W = ma
Since the painter is at rest, a = 0.
T + N - W = 0
T = W - N
T = Mg - N
Now draw a free body diagram of the chair. The chair has three forces acting on it also. The tension in the rope pulling it up, the normal force pushing down, and gravity pulling down.
Newton's second law for the chair:
∑F = ma
T - W - N = ma
Since the chair is also not accelerating, a = 0:
T - W - N = 0
T = W + N
T = mg + N
Now we have two equations and two variables. If we add the equations together, we can eliminate N:
2T = Mg + mg
2T = (M + m) g
T = (M + m) g / 2
Given that M = 55 kg, m = 10 kg, and g = 9.8 m/s²:
T = (55 + 10) (9.8) / 2
T = 318.5 N
If we round to two sig-figs, the tension in the rope is 320 N.
The tension in the rope is 637 Newtons, which is the total weight of the painter and chair multiplied by the acceleration due to gravity (9.8 m/s^2). This is because the system is at rest, so the tension in the rope must balance out the downward force of gravity.
Explanation:The subject of this question is Physics, specifically when discussing forces and tension in ropes. The situation describes a house painter who is on a chair, lifted by a pulley system, and the entire system is at rest. We assume that the only forces acting on the system are gravity and the tension in the rope.
Both the painter and the chair are experiencing a downward force due to gravity. We can calculate this by multiplying their mass by the acceleration due to gravity (which is about 9.8 m/s^2 on Earth). For the painter, this is 55 kg * 9.8 m/s² = 539 N. For the chair, it is 10 kg × 9.8 m/s² = 98 N.
Because the system is at rest, the rope must be exerting an equal and opposite force upwards, to balance out the force of gravity. This force is the tension in the rope. If we add up the forces acting on the painter and the chair, we get a total of 539 N + 98 N = 637 N. So, the tension in the rope is 637 Newtons.
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What type of season does Daytona Beach, FL most likely have?
very cold winters
mild winters
very hot summers
no winters
i think its very hot summers
This question is very unscientific. It uses a lot of rubber words ... "very cold", "mild", and "very hot" ... words without definite meanings, that mean different things to different people, and may even mean different things to the same person at different times.
To me, any place in North America located south of the latitude of Chicago has a climate characterized by very hot, very humid, very oppressive, mercilessly long Summers, and weak, anemic, negligible, absurd excuses for Winters.
Polar molecules have _____. A) an uneven distribution of charges around the molecule B) atoms that are the same element C) an even distribution of charges around the molecule D) ionic bonds
Answer: ionic bonds
Explanation:
Answer:
D) ionic bonds
Explanation:
Polar molecules are defined as the molecules in which we will have two poles or we can say that in these type of molecules the positive and negative center of the charge is separated by small distance.
this system of charge which is separated by small distance is known as dipoles or polar molecules.
Here we know that these two charged molecules will separate by small distance so here the force between these molecules are due to electrostatic force and hence they form a strong bond between the molecules.
This strong bond between charged molecules is known as Ionic Bonds
So here correct answer will be
(D) ionic Bond
Why do objects under water appear to be bigger or closer than what they do in air?
An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air.
if two identical cars are traveling at different velocities, which car has the greatest momentum
Answer:
The one with highest velocity
Explanation:
The momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the car
v is the velocity of the car
In this problem, we have two identical cars: identical means they have same mass, so
[tex]m_1 = m_2 = m[/tex]
The momentum of car 1 is
[tex]p_1 = mv_1[/tex]
while the momentum of car 2 is
[tex]p_2 = mv_2[/tex]
By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.
(a) Figure 1 shows a mas of 1200 kg hung by a massless cable supported by a counterweight of mass 900 kg. You may assume the gravitational acceleration to be 10 m/s2.
Determine the magnitude of the acceleration (in m/s2) of the 1200 kg mass and also the magnitude of the tension (in N) in the cable. Show your workings clearly.
Please help me bcoz I don't really understand how to do without a proper explanation behind the working. I'm quite weak in this subject, I m sorry :(
Answer:
1.43 m/s², 10,300 N
Explanation:
First things first is to draw a picture. Fortunately, one was already provided.
Next, we need to draw a free body diagram for each mass.
The 1200 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Similarly, the 900 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Now we apply Newton's second law. Let's start with the 1200 kg. If we say that up is positive, then:
∑F = ma
T - W = M(-a)
T - Mg = -Ma
Notice that I made the acceleration negative. That's because we know that the heavier mass will be accelerating down.
Now we apply Newton's second law to the 900 kg mass:
∑F = ma
T - W = ma
T - mg = ma
Now we have two equations and two unknowns (T and a). Let's solve for the acceleration first. To do that, let's subtract the two equations so we can eliminate T (if you prefer, you can also use substitution instead):
-mg − (-Mg) = ma − (-Ma)
-mg + Mg = ma + Ma
g (M - m) = a (M + m)
a = g (M - m) / (M + m)
Given that M = 1200 kg, m = 900 kg, and g = 10 m/s²:
a = 10 m/s² (1200 kg - 900 kg) / (1200 kg + 900 kg)
a = 10/7 m/s²
a ≈ 1.43 m/s²
Now let's find the tension by plugging our answer into either of the two equations.
T - mg = ma
T - (900 kg) (10 m/s²) = (900 kg) (10/7 m/s²)
T = 72000/7 N
T ≈ 10,300 N
I'm not sure what rounding rules you need to follow, but hopefully this helps.
What is the magnetic force acting on an electron if its speed is 3.0 × 106 meters/second and the direction is perpendicular to a magnetic field of 0.020 teslas? The value of q = -1.6 × 10-19 coulombs.
A. F = 0 newtons
B. F = -6.0 × 10-15 newtons
C. F = -9.6 × 10-15 newtons
D. F = -3.0 × 10-16 newtons
E. F = -3.2 × 10-21 newtons
Answer:
[tex]9.6\cdot 10^{-15} N[/tex]
Explanation:
The magnetic force acting on a charged particle moving perpendicularly to the field is given by:
[tex]F=qvB[/tex]
where
q is the charge
v is the speed of the particle
B is the magnetic field strength
In this problem, we have:
[tex]q=-1.6\cdot 10^{-19} C[/tex] is the charge
[tex]v=3.0\cdot 10^6 m/s[/tex] is the speed
[tex]B=0.020 T[/tex]
so, the magnetic force is
[tex]F=(-1.6\cdot 10^{-19} C)(3.0\cdot 10^6 m/s)(0.020 T)=9.6\cdot 10^{-15} N[/tex]
Answer:
For plato users: Option C.
Explanation:
through which type of media can mechanical waves move ?
Answer: Solids, liquids, and gasses.
Explanation:
well a mechanical wave is a disturbance in matter that carries energy from one place to another, and a medium (or media because you put the question in pluralised form) is matter through which a wave travels. So, Solids, liquids, and gasses.
5. The load across a battery consists of two resistors, with values of 15 Ohm and 45 Ohm connected in series.
a) What is the total resistance of the load?
b) What is the voltage of the battery if the current in the circuit is 0.1 A?
a) [tex]60 \Omega[/tex]
The total resistance of resistors connected in series is equal to the sum of the individual resistances:
[tex]R=R_1 + R_2 + .... + R_n[/tex]
In this problem, we have two resistors connected in series:
[tex]R_1 = 15 \Omega[/tex]
[tex]R_2 = 45 \Omega[/tex]
So the total resistance of the circuit is
[tex]R=R_1 + R_2 = 15 \Omega + 45 \Omega = 60 \Omega[/tex]
b) 6.0 V
The relationship between voltage, current and resistance of a circuit is given by Ohm's law
[tex]V=RI[/tex]
where
V is the voltage
R is the total resistance
I is the current
In this circuit, we have
[tex]R=60 \Omega[/tex] is the total resistance
I = 0.1 A is the current
So, the voltage of the battery is
[tex]V=(60 \Omega)(0.1 A)=6.0 V[/tex]
This chart shows characteristics of three different types of atoms. Which statement is best supported by the information in the chart? Atom X will donate electrons to Atom Y. Atom X will accept electrons from Atom Y. Atom Y will accept electrons from Atom Z. Atom Z will donate electrons to Atom X. 99 PTS FOR ANSWER
- Atom X will accept electrons from Atom Y.
Answer:
Atom X will accept electrons from Atom Y is correct!
Fill in the blanks to complete the statements.
If an object changes speed on
results in acceleration
its velocity also changes. Any change in
Answer:
When an object changes speed (increases/decreases) it results in acceleration/de acceleration, its velocity also changes.
Explanation:
Acceleration is the rate of change in velocity.An object can accelerate when speed increases, decreases or direction changes. All these instances involves a change in velocity.Velocity is a vector quantity thus it has magnitude and the direction.Acceleration due to change in direction is centripetal acceleration.The expression for finding acceleration is;
a=change in velocity/change in time
a=Δv/Δt in m/s²
Answer:
direction and velocity