According to Newtons' first law of motion, the block needed to be pushed to move from rest. Similarly need a force to stop its motion as well due to its inertia.
What is inertia ?Newton's first law of motion states that, an object tends to stay in its state of motion or rest until an external force acts on it. This tendency to continue in the current state of the object is called its inertia.
Thus, an object at rests continue on rest if a force make it move. A stationary bus will move backwards when it is started quickly due to its inertia in rest. Similarly it will move to front when stopped suddenly.
Here, the block was initially at rest. If it is pushed it gains a kinetic energy and starts moving. When it moves with a constant speed it tends to continue in the moving and cant stop it until another force comes to stop it.
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in the system to the right, the pulleys are frictionless and the system hangs in equilibrium. Determine the values of each of the unknown weights.
In a frictionless pulley system in equilibrium, the sum of the forces equals zero. To find the unknown weights, set up a balance of forces equation, following Newton's second law, and solve for the unknown.
Explanation:In a frictionless pulley system hanging in equilibrium, the sum of the forces in the system is equal to zero as there is no net force acting in any direction. This is derived from Newton's second law. So, to determine the unknown weights in this equilibrium system, you will need to set up a balance of forces equation. For example, if we have a pulley system with weights W1, W2, and W3, where W1 and W3 are known and W2 is unknown, we can set up the following equation according to Newton's law: W1 + W2 = W3. Solving this equation will give us the value of the unknown weight W2.
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Which of the following is the best example of proper hypothesis?
A. I think there is no effect on hearing if you listen to loud music only 3 hours a day.
B. Children who wear backpacks do better academically.
C. Orange popsicle taste sweeter than grape popsicles.
D. If two object are dropped at the same height ,the heavier objectwill got first.
I believe that the correct answer is D
The hang time of a basketball player who jumps a vertical distance of 2 feet (0.6 m) is about 2/3 second. What will be the hang time if the player reaches the same height while jumping 4 feet (1.2 m) horizontally?
A basketball rolls to a stop along a gym floor without anyone touching it. What answer choice BEST explains why this occurred?
A) The initial force that started the ball ran out.
B) The opposing force of friction stopped the ball.
C) The natural state of the ball is not to be in motion.
D) The force of gravity slowed the ball until it stopped.
Tell me if i'm wrong
Answer: The correct option is B.
Explanation:
In the given problem, a basketball rolls to a stop along a gym floor without anyone touching it.
The basketball stops own its own because of the force of friction. Friction is a force which opposes the motion of the object. The direction of the force of friction is in an opposite direction to the motion of the object.
The frictional force will act between the basket ball and the floor.
Therefore, the correct option is B.
Homogeneous mixtures can exist A) only in the gas phase. B) only in the solid phase. C) as liquid, solid, or gas. D) only in the liquid phase
The answer is c. as liquid,solid, or gas.
C) as liquid, solid, or gas.
Explanation;A mixture is a substance that is made up of two or more substances. A mixture may be either homogeneous or heterogeneous.A homogeneous mixture is a mixture in which the components are uniformly distributed. This means there is only one phase of matter, hence a homogeneous mixture can exist as a solid, gas or liquid.A heterogeneous mixture on the other hand is a type of mixture in which the components making the mixture are not uniform. A heterogeneous mixture contains more than one phases of matter. These types of mixtures may be either suspensions or colloids.How did the theory of relativity change the law of conservation of energy?
It stated that energy could be transformed into matter, therefore the amount of matter equals the amount of energy.
It stated that matter could be transformed into energy, therefore the amount of matter equals the amount of energy.
It stated that energy could be transformed into matter, therefore the amount of matter and amount of energy together are conserved.
It stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
The theory of relativity merged the conservation of matter and energy into a single concept where mass can be converted into energy and vice versa, altering the classical conservation of energy law to include mass-energy equivalence. Thus, it stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
The theory of relativity transformed the law of conservation of energy by introducing the concept that matter could be transformed into energy, and vice versa. Albert Einstein's famous equation [tex]E = mc^2[/tex] highlights the equivalence of mass (matter) and energy, thus redefining the principle of conservation. Essentially, it stated that the total amount of matter and energy together are conserved, not each separately, allowing for the conversion from one to the other. This redefinition of energy to include the possibility of mass changing into energy is fundamentally important in fields such as nuclear physics, where reactions within a nuclear reactor exemplify this interchange.
Thus, it stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
Helium is considered a noble gas because it has a _blank___ valence electron shell
A car increases its speed from 9.6 meters per second to 11.2 meters per second in 4.0 seconds. The average acceleration of the car during this 4.0-second interval is
true or false surface tension is a property of gases
Which energy transformation converts energy from the sun’s core to light energy needed by plants?
nuclear to chemical
chemical to thermal
nuclear to electromagnetic
chemical to electromagnetic
Description
Answer:
c nuclear to eletricmagnetic
Explanation:
Which number represents an acidic pH, 4 or 9? ______
The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by which balanced chemical equation?
A) N2(g) + 2O2(g) → N2O4(g)
B) N2O4(g) → N2(g) + O2(g)
C) N2O4(g) → N2(g) + 2O2(g)
D) N2O4(g) + 2O2(g) → N2(g)
Answer : The correct option is, (C) [tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
Explanation :
Decomposition reaction : It is a type of reaction in which a single compound decomposes into two or more new compounds.
The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by balanced chemical equation.
The balanced decomposition reaction will be,
[tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
By the stoichiometry, 1 mole of dinitrogen tetraoxide decomposes into 1 mole of nitrogen gas and 2 moles of oxygen gas.
Hence, the correct option is, (C)
velocity is a description of both speed and direction therefore it is________
the same as acceleration
a vector
a force arrow
a magnitude
Answer: a vector
Explanation:
In physics, there are two types of quantities:
- scalars: scalar quantities are characterized by a magnitude only. Examples of scalars are: mass, time, length, and speed
- vectors: vector quantities are characterized by both a magnitude and a direction. Examples of vectors are: force, displacement, and velocity.
Velocity, in fact, is a vector, because it includes:
- a magnitude, which is the speed, given by the ratio between displacement and time taken: [tex]v=\frac{s}{t}[/tex]
- a direction
Because of churning rock and ash, the largest volcanic eruptions are sometimes surrounded by
Large volcanic eruptions are sometimes surrounded by lighting and calderas. That's because the flying ash and rocks rub together producing static electricity. When enough static electricity builds up flash lightning discharges it.
What is Volcanic eruptions ?"A volcano is an opening or rupture in the earth’s surface that allows magma (hot liquid and semi-liquid rock), volcanic ash and gases to escape. "They are generally found where tectonic plates come together or separate but they can also occur in the middle of plates due to volcanic hotspots. A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively. The most dangerous type of eruption is called a 'glowing avalanche' which is when freshly erupted magma flows down the sides of a volcano. They can travel quickly and reach temperatures of up to 1,200 degrees Fahrenheit. Other hazards include ash fall, and lahars (mud or debris flows). Volcanoes often cause population displacement and food shortages.
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1) What would the average acceleration be for a car at a stoplight that speeds up to 20 m/s in 10 seconds (in m/s^2)
2) Imagine that a car traveling at 100 m/s must slam on the brakes to avoid hitting a raccoon. If it takes 4 seconds for the car to slow down to a stop, what is its acceleration (in m/s^2)
Answer:
Part a)
a = 2 m/s/s
Part b)
a = - 25 m/s/s
Explanation:
As we know that the average acceleration id defined as the rate of change in the velocity of the object
so here it is given by formula
[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]
now we know that
[tex]v_f = 20 m/s[/tex]
[tex]v_i = 0[/tex]
[tex]\Delta t = 10 s[/tex]
now we have
[tex]a = \frac{20 - 0}{10} = 2 m/s^2[/tex]
Part b)
here car is travelling with speed 100 m/s
now driver slams brakes and car finally stop in t = 4 s
so the average acceleration is given as
[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]
now we know that
[tex]v_f = 0 m/s[/tex]
[tex]v_i = 100[/tex]
[tex]\Delta t = 4 s[/tex]
now we have
[tex]a = \frac{0 - 100}{4} = -25 m/s^2[/tex]
discuss the difference between molarity and molality, state the units of each, state the symbol of each, and give an example of how each can be used when you are determining the concentration of a solution
Final answer:
Molarity, symbolized by M, is the moles of solute per liter of solution and is useful for stoichiometric calculations. Molality, symbolized by m, is the moles of solute per kilogram of solvent and is beneficial for temperature-dependent calculations like boiling point elevation. Both have distinct units, molarity in mol/L and molality in mol/kg.
Explanation:
The difference between molarity and molality lies in their definitions and units of measurement. Molarity, denoted by the symbol M, is a measure of concentration defined as the number of moles of solute per liter of solution (mol/L). It is commonly used in chemistry to discuss reactions where solute is a reactant or product, allowing conversion from moles to grams using molar mass.
On the other hand, molality, represented by the symbol m, is defined as the number of moles of solute per kilogram of solvent (mol/kg). Molality is independent of temperature and pressure because it's based on mass, which is particularly useful when dealing with reactions that involve significant temperature changes. For example, in calculating the freezing point depression or boiling point elevation, molality is used due to its temperature-independent nature.
Example of molarity: To determine the amount of sodium chloride needed to prepare 2 liters of a 0.5 M NaCl solution, you would use the formula M=moles/L and rearrange it to calculate moles = M × L. Therefore, you need 1 mole of NaCl (0.5 moles/L × 2 L).
Example of molality: When calculating the change in boiling point of water with a dissolved non-volatile solute, molality is used to determine the moles of solute per kilogram of water, which can then be plugged into the boiling point elevation formula.
Aliens from planet Moby have three alleles for skin color: R (red) W(white) and B (Blue). If all of these alleles are codominant and aliens on planet moby can only inherit two alleles for a gene, what are the six possible genotypes for skin color in these aliens?
The aliens from planet Moby can present six possible genotypes resulting from combinations of the three codominant alleles R, W, and B: RR, WW, BB, RW, RB, and WB. Each genotype would result in a unique phenotype, with RW being a mix of red and white, RB a mix of red and blue and WB a mix of white and blue. This is an example of a multiple allele system, which is basic to studying genetics.
Explanation:Because aliens from planet Moby can only inherit two alleles for a gene and all the alleles (R for red, W for white, and B for blue) are codominant, the six possible genotypes would be: RR - for red, WW - for white, BB - for blue combinations like RW - for red and white, RB - for red and blue, and WB - for white and blue. It's worth noting that in this codominant system, each genotype corresponds to a unique phenotype completely different from the others.
For instance, the genotype 'RW' would be expressed as a mix of red and white, 'RB' would be a mix of red and blue, and 'WB' would be a mix of white and blue. Such systems where multiple alleles are controlling a single trait are known as multiple allele systems, and they often display more than just two phenotypes in the population.
Understanding multiple allele systems and codominant systems is a fundamental aspect of the study of genetics. This knowledge helps scientists understand genetic diversity and inheritance patterns among populations more comprehensively.
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Amy has a mass of 30 kg, and she is riding a skateboard traveling 5 m/s. What is her momentum?
The table shows the percentages of hydrocarbons that are found in a sample of crude oil.
Hydrocarbons
Percentage
Paraffins
30
Naphthenes
49
Aromatics
15
Asphaltics
6
Based on the given information, what is the best classification for this sample of crude oil?
an element
a pure compound
a pure substance
a mixture
Answer:
It is a mixture.
Explanation:
Crude oil is obtained from the earth.
It is a mixture of several substances.
The substances can be obtained by the fractional distillation, because they all have different melting and boiling points.
Answer:
Option (4)
Explanation:
Crude oil is referred to the fossil fuel that is formed from the burial of ancient flora and fauna. These are often found to be trapped in the sedimentary type of rocks such as sandstone and limestone.
These are a highly complex mixture of hydrocarbons, comprised of paraffin, naphthenes, asphalts and some other aromatic hydrocarbons. They are also found to contain a low amount of sulfur and some trace amounts of nitrogen as well as oxygen compounds.
These oils can also be refined in order to make diesel, petrol and gasoline.
Thus, the correct answer is option (4).
Why couldn't Mendeleev organize the entire periodic table during his research? Question options: The elements showed no periodic properties. The atomic number was unknown at the time. Some elements were undiscovered at the time. The atomic mass was unknown at the time.
Answer:
Correct Answer:
Some elements were undiscovered at the time.
Explanation: This is straight from the test.
PLEASE HELP I WILL GIVE BRAINLIEST Which substances will make a salt when combined? Vinegar and tea Soda and wine Soda and ammonia Fertilizer and detergent
imagine riding a single-speed bicycle. why do you have to push harders on the pedals to start the bicycle moving than to keep it moving at constant velocity ?
Pushing harder on the pedals when starting a bicycle is required to overcome inertia and higher static friction compared to the lesser force needed to maintain constant velocity due to rolling resistance and air resistance.
The reason you must push harder on the pedals to start a bicycle moving rather than to keep it moving at a constant velocity is due to inertia and the static friction present when the bicycle is at rest. Starting the bicycle requires enough force to overcome inertia, which is the property of matter that resists changes in its state of motion. Since the bicycle and rider are initially at rest, a greater force is needed to accelerate them to a moving state. Additionally, static friction between the tire and the ground is higher when the bike is stationary. Once the bicycle is in motion, only enough force to overcome rolling resistance and air resistance is necessary to maintain a constant velocity, which is generally less than the force required to start moving from rest.
A scientist plans to find out the percent of teenagers who like science. She interviews 500 teenagers leaving a science museum and finds that 450 of them like science. The scientist concludes that 90 percent of teenagers like science. Why is the scientist's conclusion most likely unreliable? adults were not interviewed the investigation was time consuming the source of information was biased very few teenagers were interviewed
She is good if the population is more than or equal to 10 times 150 or 10 times 150. That is a question we don't know the answer to because we don't know the size of the student body at the school. She might have been too big, thus we need the end times.
What interviews 500 teenagers leaving a science museum?The information came from a biased source. Like asking everyone you meet if they enjoy fishing while strolling along a country riverbank. Or by asking the 500 spectators in the stands if they enjoy baseball.
She will assume that the population is 0.72 if I multiply 100 and 50 by 500.72, and I will multiply 100 and 50 by 0.28. I was hoping it was 100 and 8. I scribbled down the number 100. 42 is more than 10.
Therefore, If the scientist had spoken with 500 kids at a rock concert or at the local basketball courts, I'm confident that she would have obtained different results.
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You can calculate the acceleration of an object moving on a straight line by dividing the blank by the time.
why did she use an red infra lamp
Where does the basketball have the greatest gravitational potential energy?
Why do elements within a group have similar chemical properties
Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.
Explanation:The elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons. Valence electrons are the outermost electrons in an atom, and they determine how the atom will react with other atoms. For example, elements in Group 1 (alkali metals) all have one valence electron, so they tend to lose that electron and become positively charged ions. Similarly, elements in Group 17 (halogens) have seven valence electrons, so they tend to gain one electron and become negatively charged ions.
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1. Moving from left to right across a row of the periodic table, which of the following values
increases by exactly one from element to element?
(1 point)
isotope number
atomic number
atomic mass unit
mass number
2. The atomic mass of an element is (1 point)
the sum of the protons and neutrons in one atom of the element.
twice the number of protons in one atom of the element.
a ratio based on the mass of a carbon-12 atom.
a weighted average of the masses of an element’s isotopes.
3. Which general statement does NOT apply to metals? (1 point)
Most metals are ductile.
Most metals are malleable.
Most metals are brittle.
Most metals are good conductors of electric current.
4. Group 7A of the periodic table contains the (1 point)
most reactive nonmetals.
most reactive metals.
least reactive nonmetals.
least reactive metals.
5. The unit for atomic mass is (1 point)
gram.
amu.
pound.
none of the above
all of those are right but #2 is a weighted average of the masses of an element's isotopes.
A certain organic compound is made up of the amino acids methionine, arginine, and leucine. Which type of organic compound is this?
B. The-protein---------
In which of the following states of matter are the particles close together but loosely connected so they can flow?