Answer:
Because they are moving to fast for Earth's gravity to pull it down.
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.
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.
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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Which property is expressed in distance units?
O
A. Period
O B. Wavelength
O C. Speed
O D. Frequency
Answer:
wavelength
Explanation:
its expressed in meters
Final answer:
The property expressed in distance units is wavelength (option B), symbolized by λ, and typically measured in meters.
Explanation:
The property that is expressed in distance units is B. wavelength. It is the distance between two corresponding points of a wave, such as the distance between the midpoints of two consecutive peaks or troughs. The symbol for wavelength is λ (lowercase Greek lambda), and the units used to describe wavelengths are typically meters (m). Frequency, denoted by ν (lowercase Greek nu), is the number of oscillations that pass a specific point in a given period of time, measured in hertz (Hz). Speed, the rate at which a wave travels through a medium, is expressed in meters per second (m/s). Period, the time it takes for one complete oscillation to occur at a fixed point, is measured in seconds (s).
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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A light wave travels through water (n=1.33) at an angle of 35º. What angle
does it have when it passes from the water into air (n=1.00)?
n, since
Use the equation , = sin
N2
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:
Heat flows from ______ substances
Answer:
hot to cold
Explanation:
Heat will always flow from hot to cold substances.
Heat flows from "hot to cold" substances.
Explanation:
"Heat flows from hot to cold" is the statement of "Second Law of Thermodynamics".
According to this law, the heat flow is due to the collision of hot atoms collides with cold atoms transferring kinetic energy. When the heat flows from "hot to cold", external energy is not required for the flow, but when it flows from cold to hot, it needs external energy in which the spontaneity of heat flow is less.
The chart shows Daniela’s run through her race.
What is her velocity?
1.5 m/s
2 m/s
2.5 m/s
5 m/s
Answer:
Its 2.5
Explanation:
She moves at 5 m per 2 seconds so she moves at 2.5 m per second
The provided data is insufficient to calculate Daniela's velocity. This is because velocity not only considers the speed but also the direction. Therefore, information on Daniela's direction during the race is necessary for an accurate calculation.
Explanation:Unfortunately, the question does not provide sufficient information to calculate Daniela's velocity. Velocity is a measure that describes how much distance an object covers in a particular direction in a given amount of time. To calculate this, we must know not just the speed (distance/time) but also the direction of travel. Without the necessary data regarding Daniela's direction of movement during her race, we cannot provide a precise velocity value.
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Which statement is an observation from Newton’s experiments with light? White light becomes a range of colors after passing through a prism. A prism adds a range of colors to white light. Newton asked questions about the makeup of white light. A prism is a useful device for experimenting with white light.
Explanation:
White light is composed by a range of colors, this was discovered by Isaac Newton when he observed that a beam of white light was refracted (the different rays of light are diverted depending on their wavelengths) when passing through a prism .
This phenomenom was later called dispersion.
An observation from Newton's experiments with light is that white light separates into a range of colors when passed through a prism, revealing that white light is composed of different colors.
The statement that is an observation from Newton's experiments with light is "White light becomes a range of colors after passing through a prism." This observation comes from a series of experiments conducted by Isaac Newton in the seventeenth century, where he demonstrated that white light is not a single pure substance but is composed of many different colors.
Newton used a prism to separate sunlight into a spectrum of colors, and then recombined them with another prism to form white light again, proving that the colors were inherent in the white light and not a creation of the prism.
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.
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.
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.
In the equation for the gravitational force between two objects, what does G represent?
The G is represented as “Universal Gravitational constant” in the gravitational force equation acting between the two objects.
Explanation:
The force of gravitation is given by following equation, [tex] \bold{F= \frac{- G (M m)}{r^2}} [/tex]
F - Force of gravitation,
G - Universal gravitational constant,
M - Mass of [tex]1^{st}[/tex] object,
m - Mass of [tex]2^{nd}[/tex] object,
R - Distance between two objects.
The negative sign here denotes that gravitational force is experienced along the line of separation of the two objects. And it also indicates that it is an attractive force between the two.
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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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.
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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could someone help and explain
Answer:The loudest of the two sound wave is second one
Explanation:because if shout the sound go high,then which one show you the highest the second one rigth
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
higher-pitched sounds have ___.
0 A.) higher amplitudes
0 B.) shorter wavelengths
0 C.) mode decibels
0 D.) lower frequencies
Answer:
c
Explanation:
_heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance.
Answer:
specific heat
Explanation:
Specific heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance
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:
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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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 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?
An object's buoyant force and weight mean the same thing.
A. True
B. False
Answer:
False
Explanation:
No. The buoyant force on an object is the portion of its weight that appears to vanish
when the object is in any fluid (could be either a liquid or a gas).
If the object happens to float in a particular fluid, then the buoyant force at that moment
is equal to the object's weight.
Notice that the buoyant force on an object will be different in different fluids.
Answer:
false
Explanation:
What type of bond is most likely to form between two gold atoms.Ametalic bond. B non polar covalent bond. C polar covalent bond. D ionic bond
the answer is A
metallic bonds are formed between metal ions
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.
Does electrons have more mass than neutrons?
Answer:
No, neutrons have about the same mass as a proton, but both have more mass than electrons.
Hope this helps a bit,
Flips
Fluorine and chlorine molecules are blamed for
Answer:
Destroying ozon molecules
Explanation:
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Which of the following equations is not balanced?
N2 + 3H2 → 2NH3
A. N2 + 3H2 → 2NH3
B. MgI2 + Br2 → MgBr2 + I2
C. KClO3 → KCl + O2
D.HCl + NaOH → NaCl + H2O
Answer: C) KClO3 → KCl + O2
Explanation:
the equation has an unequal amount of oxygen.
you can confirm because all the other equations are balanced so the answer is c
Answer:
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
(C) is correct option
Explanation:
Balanced equation :
In balanced equation, The number of atoms of each element in product side equal to the number of atoms of each element in reactant side.
The equation is not balanced in option C.
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
In this equation, The number of oxygen element in product side is not equal to the number of oxygen element in reactant side.
All equations are balanced.