Answer:
[tex]49.7^{\circ}[/tex]
Explanation:
We can solve the problem by using Snell's law:
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where
n1 = 1.33 is the index of refraction of the first medium (water)
n2 = 1.00 is the index of refraction of the second medium (air)
[tex]\theta_1 = 35^{\circ}[/tex] is the angle of incidence of the wave in water
[tex]\theta_2[/tex] is the angle of refraction of the wave in air
Solving for the angle of refraction,
[tex]sin \theta_2 = \frac{n_1 sin \theta_1}{n_2}=\frac{(1.33) sin 35^{\circ}}{1.00}=0.763\\\theta_2 = sin^{-1} (0.763)=49.7^{\circ}[/tex]
Answer:
49.7
Explanation:
how does a circuit breaker protect a refrigerator?
a. when the current is too high, a metal strip in the fuse melts and opens the circuit.
b. when the resistance is too high , a re-settable which opens a circuit
c. when the current is too high , a re-settable switch opens the circuit
d. when the resistance is too high a metal strip in the fuse melts and opens the circuit
Answer:
C. When the current is too high, a reset-able switch opens the circuit.
Explanation:
The circuit breaker has an electromagnet that has a specific maximum magnetic force. When the current becomes too high the core is magnetized
and attracts a soft iron armature which automatically breaks the circuit. Once the problem has been fixed the circuit breaker is reset by a switch.
Answer: When the current is too high, a resettable switch opens the circuit.
Explanation: A P E X
If you add together all of the forces exerted on a object and get a non zero value that is called
Hello There!
If you add together all of the forces exerted on a object and get a non zero value that is called the "NET FORCE" of the object
If you add together all of the forces acting on an object, the sum is called the NET FORCE on the object.
It might or might not be zero. If it's NOT zero, then you know immediately that the object must be accelerating ... either its speed, or its direction, or both are changing.
If we decrease the amount of force and keep all other factors the same what will happen to the amount of work
It will decrease in the same proportion.
The sticky substances in cigarettes that coat the lining of the
lungs are _____.
Answer:
Tar
Explanation: Tar is a big ingredient in cigarettes and can cause the sticky substance
Answer:
Tar
Explanation:
tar is a sticky substance consisting of inorganic and organic compounds.
Tar is very toxic and can cause cancer when deposited on the lungs
Which type of reaction is shown in this energy diagram ?
Answer : The correct option is, D.
Explanation :
Activation energy : It is defined as the minimum amount of energy given to the reactant so that it gets converted into products.
Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.
In the endothermic reaction, the energy of reactant are less than the energy of product.
Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.
In the exothermic reaction, the energy of reactant are more than the energy of product.
From the given options we conclude that the energy diagram shows endothermic reaction because energy is absorbed from the surrounding.
Hence, the correct option is D.
Fluorine and chlorine molecules are blamed for
Answer:
Destroying ozon molecules
Explanation:
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Provide the following information for each of the three types of radiations from naturally radioactive materials. Be sure to include the following:
Charge
Mass
Relative penetrating power
The effect an electric field would have on it
Alpha radiation: Particles. Each alpha particle is a little bundle of 2 protons and 2 neutrons ... identical to the nucleus of a Helium atom.
Charge . . . +2 elementary charges
Mass . . . 4 Atomic Mass Units
Relative penetrating power . . . low
The effect an electric field would have on it . . . Since the alpha particle has a positive charge, it's repelled by other positive charges, and attracted toward negative charges.
Beta radiation: Particles. Each beta particle is an electron.
Charge . . . -1 elementary charge
Mass . . . 0.00055 AMU
Relative penetrating power . . . medium
The effect an electric field would have on it . . . repelled by other negative charges, and attracted toward positive charges.
Gamma radiation: electromagnetic wave, verrrrry short wave, high frequency
Charge . . . electromagnetic wave, no charge
Mass . . . electromagnetic wave, no mass
Relative penetrating power . . . high
The effect an electric field would have on it . . . electromagnetic wave, no effect
the force needed to overcome static friction is usually less than that needed to overcome kinetic friction.
true or false?
The statement is False. The force needed to overcome static friction is usually greater than that needed to overcome kinetic friction.
To understand why this is the case, let's first define static and kinetic friction. Static friction occurs when two surfaces are at rest relative to each other, while kinetic friction occurs when there is relative motion between the surfaces.
The force of friction [tex]\( F_f \)[/tex] can be calculated using the formula[tex]\( F_f = \mu \times N \)[/tex] , where [tex]\( \mu \)[/tex] is the coefficient of friction and N is the normal force exerted perpendicular to the surfaces.
1. Static friction force [tex]\( F_{f\_static} = \mu_s \times N \)[/tex]
2. Kinetic friction force [tex]\( F_{f\_kinetic} = \mu_k \times N \)[/tex]
The coefficient of static friction [tex]\( \mu_s \)[/tex] is typically greater than the coefficient of kinetic friction [tex]\( \mu_k \), meaning \( \mu_s > \mu_k \).[/tex]
Let's assume a scenario where [tex]\( \mu_s = 0.6 \) and \( \mu_k = 0.4 \),[/tex] and the normal force [tex]\( N = 50 \)[/tex] N.
1. [tex]\( F_{f\_static} = 0.6 \times 50 = 30 \) N[/tex]
2. [tex]\( F_{f\_kinetic} = 0.4 \times 50 = 20 \) N[/tex]
In this scenario, the force needed to overcome static friction (30 N) is indeed greater than the force needed to overcome kinetic friction (20 N).
Static friction is generally higher than kinetic friction due to the microscopic irregularities and interlocking between surfaces at rest. When an object is at rest on a surface, these irregularities create a stronger bond that requires more force to break and initiate motion. Once the object starts moving (kinetic friction), the surfaces are no longer interlocked to the same degree, leading to lower frictional forces.
Therefore, the force needed to overcome static friction is usually greater than that needed to overcome kinetic friction.
Complete Question:
The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?
How many elements are needed to make a compound?
Hello There!
Your answer is 2.
This is because compounds consist of at least 2 elements.
Answer:
2
Explanation:
there should be at least 2 compound to make an element
like 2 atoms, etc...
hope it helps
and ur welcm
:D
what is biasing and doping
Answer:
Biasing - Biasing means being unfair to someone or something, and liking the other one or helping them.
Doping - Doping is where a person use drug to get better at sporting and get stronger muscles, such as getting stronger, getting faster and so on. It is mostly used by athletics.
Answer:
illegal use of ergogenic substances
Explanation:
During photosynthesis,
Answer: Water is oxidized during photosynthesis.
Sawyer is studying diffraction. He draws a diagram of a plane wave to show how light waves travel.
Which best describes Sawyer’s error?
The wave fronts should be perpendicular to the direction in which the waves move.
The arrow showing the direction of movement of the waves should be pointing to the left.
The arrow showing the direction of movement of the waves should be pointing downward.
The wave fronts should be both parallel and perpendicular to the direction in which the waves move.
Answer: Choice A
Explanation: The wave fronts should be perpendicular to the direction in which the waves move.
The best describes Sawyer’s error is the wave fronts should be perpendicular to the direction in which the waves move. The correct option is A.
What is diffraction?The spectrum of white light formed when it is passing through the obstacle.
Sawyer is studying diffraction. He draws a diagram of a plane wave to show how light waves travel.
The Sawyer’s error was that the wave fronts must be drawn perpendicular to the direction in which the waves move.
Thus, the correct option is A.
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The rate at which velocity changes over time is
The rate at which velocity changes over time is acceleration.
Acceleration is the term used to describe how quickly a velocity varies over time. It's a vector quantity with both magnitude and direction. It is a measure of how quickly the velocity of an object alters over time.
Mathematically, acceleration (a) is determined by dividing the change in velocity (v) by the change in time (t):
a = Δv / Δt
In other words, the ratio of the change in velocity to the time required for that change to occur is known as acceleration. Positive acceleration occurs when an object's velocity rises, and negative acceleration, also known as deceleration, occurs when an object's velocity decreases.
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what most be part of quantitative observations
Answer:
Quantitative observations are performed with devices such as rulers, balances, measured cylinders, beakers, and regulators. ... the process of making an understanding based on observations and previous knowledge. Quantitative investigations always involve numbers.
Explanation:
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AB+C --> AC+B is the general equation for which one of the following types of chemical reactions?
A.) Combination
B.) Single-displacement
C.) Decomposition
D.) Double-displacement
Answer:
B
Explanation:
This is an example of single replacement (or single displacement). One element (in this case, C) replaces a similar element in a compound (in this case, the B in AB).
The correct option is b.
The given chemical equation represents a Single-displacement reaction where one element displaces another from a compound. Its occurrence is dependent on the reactivity of the free element.
Explanation:The general equation AB + C --> AC + B is characteristic of a Single-displacement chemical reaction. In a single-displacement reaction, one element is displaced from its compound by another element. Here, element C displaces B from compound AB to form AC and release element B.
A crucial aspect of a single-displacement reaction is that the free element must be more reactive than the bound element for the reaction to occur. If C is more reactive than B, then the reaction ensues.
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when studying atoms, scientists can ignore the blank force
Answer:
Gravitational Force
Explanation:
The force of gravitation between the charged particle is the force which is being ignored by the scientist while studying the atom as it is very small in comparison to other forces in the atom
Explanation:
The gravitation force between the atoms are very small or you can say it is negligible to be taken into consideration, as the values as small as these procure errors and difficulties in calculation or derivation, therefore are being ignored by the scientist.
The gravitational force between the charged particles are extremely small due to the fact that it depends upon the masses of the object and masses of charged particles in the atom are small and so force is small too.
Sort the sentences based on whether they are correct or incorrect. Water boils at a temperature below 100°C at higher altitudes. Water expands on freezing. Water contracts on freezing. Water boils at a temperature below 100°C in a pressure cooker. The density of water decreases on freezing. Water boils at 100°C under normal pressure.
Answer:
Correct sentences
Water boils at a temperature below 100°C at higher altitudes-At higher altitudes where atmospheric pressure is low, less heat is required to make water boil.Increase in elevation, decreases the amount of energy required to make water boil.The boiling point of water is less at higher attitudes because the atmospheric pressure is already low thus less vapor pressure is needed to create a balance thus less heat will be required.Water expands on freezing.Before 4°C water behaves normal in that it contracts as it cools.However, at 4°C it starts to expand at a smaller margin until the freezing point is reached.During freezing, it expands.The density of water decreases on freezing.As water cools towards 4°C,it contracts.The contraction will result to increased density of course.However, when it reaches 4°C the behavior changes because it attains maximum density at 4°C.Beyond this point, water density reduces as it nears the freezing point.Water boils at 100°C under normal pressure.The boiling point of at normal atmospheric pressure is 100°C.This is for the case of pure water.However, adding salt to water will increase its boiling point even when pressure is normal.Incorrect sentences
Water contracts on freezing.Water expands on freezing.The contracting effect is experienced before water starts to freeze.This is before it reaches 4°C.At 4°C the expansion process starts at a smaller margin and it reaches the highest during freezing.Water boils at a temperature below 100°C in a pressure cooker. In a pressure cooker, water boils at 121°C.This is because the water is sealed thus the pressures inside are increased and heat is trapped inside.This trapped heat further causes the water to boil faster as it it supplies extra energy to heat the water.higher-pitched sounds have ___.
0 A.) higher amplitudes
0 B.) shorter wavelengths
0 C.) mode decibels
0 D.) lower frequencies
Answer:
c
Explanation:
An impulse is applied to a moving object with a force of 10 N for 2 seconds. Calculate the change in momentum of the object.
Answer:
The correct answer to this question is 20 N*s.
Explanation:
To solve this problem, we must remember that impulse is equal to change in momentum.
Change in momentum = impulse
Now, we must use the equation for impulse to solve the problem.
Impulse = force * time
Next, we can just plug in the given information to find our answer.
Impulse = 10 N * 2 s
Impulse = 20 N*s
As we proved earlier, the impulse is equivalent to the change in momentum, and thus the change in momentum is equal to 20 N*s as well.
Hope this helps!
Final answer:
The impulse applied to the object is calculated by multiplying the force (10 N) by the time interval (2 seconds), resulting in a change in momentum of 20 kg·m/s.
Explanation:
Calculating the Change in Momentum
To calculate the change in momentum (also known as impulse), we can use the formula:
Impulse (J) = Force (F) × Time (t)
In this problem, the force applied is 10 N and the time during which the force is applied is 2 seconds. By multiplying these values, we can find the change in momentum.
Impulse (J) = 10 N × 2 s = 20 kg·m/s
The change in momentum of the object is therefore 20 kg·m/s.
This means that the object experienced a momentum change of 20 kg·m/s due to the impulse applied. This concept is directly proportional to the duration of the force applied as represented in various physics problems and examples.
which of the following objects is in static equilibrium?
a- an apple falling from a tree
b- a bicycle sitting on the ground
c- a motorcycle speeding up
d- a car moving at a constant velocity
Answer:
b- a bicycle sitting on the ground
Explanation:
'Static' means it's not moving.
So, only the answer listed as "a bicycle sitting on the ground" corresponds to that condition.
All others possible answers describe something that is moving (an apple falling, a motorcycle accelerating, a car moving at a constant speed). Even if they are going at a constant speed, they are moving, so not static.
A bicycle sitting on the ground is in static equilibrium because it is at rest, and there are no unbalanced forces acting on it. Objects that are accelerating or moving are not in static equilibrium. Only objects at rest can be in static equilibrium.
To determine which object is in static equilibrium from the given choices, we need to understand what static equilibrium means. An object is in static equilibrium when it is at rest or moving with a constant velocity, and there is no net force or net torque acting on it.
An apple falling from a tree is not in static equilibrium because it is accelerating due to gravity.A bicycle sitting on the ground is in static equilibrium because it is at rest, and there are no unbalanced forces acting on it.A motorcycle speeding up is not in static equilibrium as it is accelerating.A car moving at a constant velocity is in dynamic equilibrium but not static equilibrium since it is moving.Therefore, the correct answer is (b) a bicycle sitting on the ground.
A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the Earth’s surface. What has the sound wave most likely encountered? a different kind of rock an underground lake an open cavity a pile of dinosaur bones
Explanation:
In general, sound (mechanical waves) travels faster in solids than in liquids, and faster in liquids than in gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).
In other words: The speed of sound varies depending on the medium through which the sound waves travel.
So, if we are told the sound wave initially had a speed of 4,000 m/s and it suddenly decreases to 1,500 m/s, this means the sound waves passed from a solid medium to a liquid medium.
Hence, the correct option is: an underground lake.
Four students want to know the most accurate way to measure the speed of a wave. The method their professor uses has a percent error of 3.68%. Each student tests a different method and writes the result in the chart below. If the accepted value of a wave is 121 m/s, who has the most accurate method of measuring the speed of a wave?
A.)the professor
B.)Erin
C.)Jean-Claude
D.)Suresh
Due to missing information in the question, we cannot definitively say who has the most accurate method for measuring wave speed. The most accurate method would be the one with the smallest percent error, so if any of the students' methods had a smaller error than the professor's 3.68%, their method would be more accurate.
Explanation:In this question, the chart listing the professor and students' methods and their associated percent errors is unfortunately missing. To accurately answer this question, we need to know the measured speed or the percent error of each student's method. In general, the most accurate method of measuring the speed of a wave would be the one with the smallest percentage error. Percentage error is a measure used to quantify the precision of an approximation, and can be calculated with the formula [(observed value - true value) / true value] x 100%.
If the provided percent error of the professor's method is 3.68%, then any method by Erin, Jean-Claude, or Suresh with a percent error less than this would be more accurate. Conversely, if their methods have a higher percent error, then the professor's method is most accurate. Without the additional data, it's impossible to definitively say who has the most accurate method of measuring the speed of a wave.
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Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. The researchers grew one type of bacteria in twenty-four identical covered petri dishes. Then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. They left the remaining six petri dishes closed as a control group. When the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. The researchers concluded that not using any hand sanitizer would lead to the least bacterial growth.
Which statement best explains why the researchers’ conclusion was not justified?
The experiment tested too many variables.
The control group was not treated the same as the experimental group.
The sample size of twenty-four petri dishes is not large enough.
The single type of bacteria is not adequate to make any conclusions.
The researchers' conclusion is not justified because they failed to treat the control group the same as the experimental group, thereby introducing a confounding variable that invalidates the comparison.
The researchers' conclusion that not using any hand sanitizer would lead to the least bacterial growth is not justified because the control group was not treated the same as the experimental group. In a well-designed experiment, all variables must be controlled except for the one being tested.
In this case, the petri dishes in the control group were kept closed, which would prevent exposure to new bacteria from the environment and limit the growth of bacteria compared to the open petri dishes with hand sanitizer. This difference in treatment is a confounding variable that can invalidate the conclusion. Instead, for a valid comparison, the control group should have been exposed to the same environmental conditions as the experimental groups without the application of hand sanitizer.
which of the following describes an action-reaction pair?
A. you push up on a barbell, and the barbell pushes you down.
B. The sun pulls on Earth, and Earth pulls on the moon
C. a man pushes a car forward, and the car pulls the man forward.
D. you push down on a desk, and the desk pushes down on the ground.
Answer:
A. you push up on a barbell, and the barbell pushes you down
Explanation:
As per Newton's third law of motion, every action has an equal and opposite reaction. The point of action and reactionary force are same. If you analyze the options given only first option fulfills this condition.
As you push the barbell up, that means action is being done on the barbell using your hand and barbell pushes you down which means that the reaction force is acting on the same point.
In other options the action is done on one object and the other force is not acting on the same object but some other object.
Answer:
The answer is A.
Explanation:
5. Alcohol users are_____
to compensate for their other losses, such as impaired vision and slower reaction time, by driving more carefully.
A.less likely B. more likely C. Neither A nor B
Alcohol users are don't realize to compensate for their other losses, such as impaired vision and slower reaction time, by driving more carefully. The correct option is C.
As a result of alcohol intake, individuals may have reduced eyesight and delayed response time. It is not, however, correct to claim that they are intrinsically more or less inclined to compensate for these losses by driving more cautiously.
Individual characteristics such as level of intoxication, decision-making ability, and risk perception can all have a significant impact on alcohol users' driving behaviour.
Some alcoholics may try to compensate by being more careful, while others may act recklessly or carelessly.
As a result, it is impossible to make a broad generalization regarding the possibility of alcohol users driving more cautiously to compensate for their impairments.
Thus, the correct option is C.
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asap? This heating curve is produced when a certain substance is heated.
Which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3?
The particles are slower in region 3.
The particles are more orderly in region 1.
The particles have more kinetic energy in region 1.
The particles have less freedom of motion in region 3.
Answer: the particles are more orderly in region 1
Explanation: region 1 is when the substance is a solid and as it is heated the particles move further apart and have more kinetic energy.
The option best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3 is the particles are more orderly in region 1
What is heating?When the temperature is increased , the body or particle is said to be heating.
Region 1 is where the substance is a solid. The temperature of solid is increased. It heated the particles and they move further apart. They will have more kinetic energy as the temperature is increased.
Thus, the option best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3 is the particles are more orderly in region 1.
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Which of the following is a mixture?
The correct option is c
Sand, choice C, is the correct answer because it is a mixture of various minerals and rocks. Silicon dioxide, carbon dioxide, and silicon are pure substances, not mixtures.
Explanation:The correct answer to your question, 'Which of the following is a mixture?' is C. sand.
Sand is considered a mixture because it can be composed of various types of minerals and rocks, like silicon dioxide which is found in quartz. However, the other components in the list, silicon dioxide, silicon, and carbon dioxide, are not mixtures.
Silicon dioxide, which may take crystalline or amorphous forms such as quartz or opal, and carbon dioxide, which is a discrete molecule without continuous bonds throughout its structure unlike silicon dioxide, are both pure substances rather than mixtures. Silicon is an element in its pure form, and it does not contain any other substances mixed into it, therefore it is also not a mixture.
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The complete question is here:
Which of the following is a mixture?
A. silicon dioxide
B. silicon
C. sand
D. carbon dioxide
A lamp draws a current of 0.50 A when it is connected to a 120 V source? What is the resistance of the lamp?
For this case we have that by definition, Ohm's Law states that:
[tex]V = I * R[/tex]
Where:
V: It's the voltage
I: It's the current
R: It's the resistance
According to the data we have to:
[tex]I = 0.50A\\V = 120V[/tex]
Clearing the resistance formula we have:
[tex]R = \frac {V} {I}\\R = \frac {120} {0.50}\\R = 240[/tex]
So, the resistance is 240 ohms!
Answer:
240Ω
The resistance of the lamp connected to a 120 V source and drawing a current of 0.50 A is 240 ohms, calculated using Ohm's law.
Explanation:The question is asking for the resistance of a lamp when a current of 0.50 A passes through it, and it is connected to a 120 V source. Using Ohm's law, which states that current (I) equals voltage (V) divided by resistance (R), or I = V/R, we can rearrange the formula to solve for R, which gives us R = V/I.
Substituting the given values into the formula:
V = 120 V
I = 0.50 A
The resistance R would then be:
R = 120 V / 0.50 A = 240 ohms.
What is one action a person can take to help ensure ability to participate in physical activity throughout life?
Answer:
Answer: B
Choices:
A)Apply sunscreen
.B)Eat steadily.
C)Do unlimited exercise.
D)Maintain flexibility.
Answer:
Exercise regularly
Explanation:
just took the test
A car driving 22.7 m/s on
flat ground drives off a 42.3 m high cliff. How much time does it take to reach the ground?
The horizontal 22.7 m/s doesn't make a bit of difference.
The whole question is: "How long does an object dropped from rest take to fall 44.3 meters ?"
To answer that, all you need is the "drop from rest" equation:
D = (1/2) · (acceleration) · (time)²
You didn't say so, but I'll assume this story all takes place on Earth, where the acceleration of gravity is 9.81 m/s².
42.3 m = (1/2) · (9.81 m/s²) · (time)²
time² = (42.3 m) / (4.91 m/s²)
time² = (42.3/4.91) s²
time = √(42.3/4.91) seconds
time = 2.94 seconds
Answer:
2.94s
Explanation:
if are acellus this is the answer.