If Kevin swims one 25.0-m stretch in 9.22 seconds, his average speed is approximately 2.71m/s.
What is Kevin's average speed over those 25 m?Speed is expressed as distance over time.
Speed = Distance / time
Given the data in the question
Distance = 25.0mTime elapsed = 9.22sAverage speed = ?Average speed = 25.0m / 9.22s
Average speed = 2.71m/s
If Kevin swims one 25.0-m stretch in 9.22 seconds, his average speed is approximately 2.71m/s.
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Which best compares convex and concave mirrors?
Answer:
Convex mirrors produce only virtual images, and concave mirrors produce real and virtual images
Answer:
covex Miros produce different thing like micronizamm and other things
how can you tell the difference between an expression of speed and an expression of velocity?
A. velocity has unit expressed as distance/time; speed does not.
B. speed has units expressed as distance/time; velocity does not.
C. speed includes a direction; velocity does not.
D. velocity includes a direction; speed does not.
The chart lists four different kinds of atoms.
A chart titled Different Kinds of Atoms with the entries calcium, gold, argon, iodine.
What is true about all of these atoms?
They cannot be solids.
They are the largest units of matter.
They are the only types of atoms that exist.
They cannot be divided and still keep the properties of the element.
They cannot be divided and still keep the properties of the element true about all of these atoms. Option D is corect.
What is an atom?The atom consists of matter that may be split without releasing electrical charges.
It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
In the nucleus proton and the neutron is exists. The condition of the atom to be electrically neutral is that the number of the proton and electron should be the same.
They cannot be separated while still maintaining the element's characteristics for each and every one of these atoms.
Hence, option D is corect.
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Answer:
The correct answer is d, they cannot be divided and still keep the properties of the element.
Explanation:
You're welcome :)
A 20kg object acceleration by a force of 200N with coefficient of kineticfriction is 0.4 what is acceleration of the object?
Answer:
Given - M = 20 kg
k = 0.4
F = 200 N
To find - acceleration
Solution -
F= kMA
200 = 0.4 * 20 * acceleration
200 = 8 * a
a = 8/200
a = 0.04 m s²
a = 0.04 m s²what are the classification of rectifier?
Thank uh ☘️
Explanation: A) half wave rectifier
B) Full wave rectifier :
1) central tapped
2) bridge rectifier
i hope this was helpful to you
The potential difference across the ends of a wire is doubled in magnitude. If ohm’s law is obeyed, which one of the following statements concerning the resistance of the wire is true?.
The potential difference across the ends of a wire is doubled in magnitude. If ohm’s law is obeyed, the resistance is not changed. Thus, option A is correct.
What is current?The current is the stream of charges which flow inside the conductors when connected across the end of voltage.
From Ohm's law, V =IR
Here, R is the proportionality constant called the resistance of the resistor.
The complete question is given in the image attached.
The potential difference across the ends of a wire is doubled in magnitude.2V = IRR =2 V/IAs, the resistance is a constant value, it does not change.
The following statements concerning the resistance of the wire true is :
The resistance is not changed
Thus, the correct option is A.
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What's the difference between the speed and velocity of an object?
question 1 options:
speed refers to the distance an object travels over time, whereas velocity represents the speed only at a given moment.
speed refers to the distance the object travels only, whereas velocity accounts for the acceleration of the object.
speed refers to the distance an object travels per unit of time only, whereas velocity also indicates the direction of travel.
speed accounts for the distance traveled and the direction, whereas velocity considers only the distance traveled per unit of time.
Answer:
C
Explanation:
velocity is a vector unit, meaning it isn't scalar so also gives direction, same as distance vs. displacement.
The main source of information used by astronomers to learn about objects in space is.
A particle moves along a straight line such that its acceleration is a=(4t^2-2)
The velocity of the particle moving along the straight line at any time, t is determined as v = 4t³/3 - 2t + C.
What is the velocity of the particle?
The velocity of an object is the rate of change of displacement with time. It is also the integral of acceleration of the object.
a = 4t² - 2
v = ∫a
v = 4t³/3 - 2t + C
Thus, the velocity of the particle moving along the straight line at any time, t is determined as v = 4t³/3 - 2t + C.
Complete question:
A particle moves along a straight line such that its acceleration is a=(4t^2-2). Find its velocity at any time, t.
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Against the park ranger's advice, a visitor at a national park throws a stone horizontally off the edge of a 83 m high cliff and it lands a distance of 93 m from the edge of the cliff, narrowly missing a visitor below.
What was the initial horizontal velocity of the rock, in m/s? You can round your answer to the hundredths place and use g ≈ 10 m/s2.
A truck going 70 m/s crashes in to a wall and comes to a complete stop in .05
seconds. What is the acceleration of the truck?
500 m/s²
O-1400 m/s²
-2000 m/s²
Answer:
-1400 m/s^2
Explanation:
Change in velocity / change in time = a
- 70 / .05 = -1400 m/s^2
which of the following would increase
Answer:
1 and 3
Explanation:
1 and 3
Increasing coils increases strength
COOLING the wire would increase current flow and strength of magnet
Adding an iron core will definitely increase the strength of the electromagnet
(1) Increasing the number of coils (✔)
Anyone able to help with this one? The volume of a gas sample is 550 mL and the pressure is 1.8 atm. What will the new volume of the gas be if the pressure increases to 2.2 atm? Round your answer to the correct number of significant figures.
Answer:
450 ML
Explanation:
Given:
Volume of gas sample: 550 mL Pressure: 1.8 atm plus 2.2 atm
To find:
The new volume of the gas after the pressure increases to 2.2 atm.
___
steps
⇒ [tex]V_1P_1=V_2P_2[/tex]
⇒ [tex](550\text{ml})(1.8\text{atm})[/tex]
⇒ [tex]=(x)(2.2\text{atm})[/tex]
⇒ [tex]x=\frac{(550)(1.8)}{2.2}[/tex]
⇒ [tex]x=450\text{ml}[/tex]
Answer:
V₂ = 450 mL
Explanation:
Because you are dealing solely with pressure and volume, you can use Boyle's Law to find the missing value. The equation looks like this:
P₁V₁ = P₂V₂
In this formula, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You have been given values for all of the variables except for "V₂". Thus, you can substitute the given values into the equation and simplify to find the answer. The final answer should have 2 sig figs to match the given values.
P₁ = 1.8 atm V₁ = 550 mL
P₂ = 2.2 atm V₂ = ?
P₁V₁ = P₂V₂ <----- Boyle's Law equation
(1.8 atm)(550 mL) = (2.2 atm)V₂ <----- Plug given values in
990 = (2.2 atm)V₂ <----- Multiply 1.8 and 550
450 = V₂ <----- Divide both sides by 2.2
What does puddicombe describe as the result of not taking any time out to simply look after our brains?
According to Puddicombe, the result of not taking any time out to simply look after our brains is that:
We get stressed. It also makes us to miss out on the most important things in life.What was Puddicombe's submission?In his popular talk, Puddicombe explained that we have been caught up with the internet and other activities so much so that we do not have time to look out for our brains.
For this reason, we stress our brains and become distant from the most important things in life.
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When the humerus moves in the glenoid fossa, the moving joint surfaces are:
When the humerus moves in the glenoid fossa, the moving joint surfaces are convex on concave.
What is Glenoid fossa?This is a bone depression in which the head of the humerus fits into to aid movement and support.
The moving joint surfaces are convex on concave in structure when humerus moves in the glenoid fossa.
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What does it mean for the forces acting on an object to be balanced?
When the forces are said to be balance, it means that net force is zero.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
The resultant of all the forces in horizontal and vertical direction is zero, when the forces are balanced.
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two conducting spheres
Answer:
[tex]\fbox {F: +3C, G: +3C}[/tex]
Explanation:
When two conducting spheres come in contact, their charges will become the mean of their charges. This takes place by the transfer of charges from the greater charged sphere to the lesser charged one.
Then :
⇒ F + G / 2
⇒ -14 + 20 / 2
⇒ 6/2
⇒ 3C
∴ Hence, both sphere F and sphere G will have a charge of +3 C.
7.Name three values you could measure as scalars and three values you could measure as
vectors.
scalars: distance, speed, time
vectors: displacement, velocity, acceleration
A ball is dropped from rest from the top of a high building. Ignore air resistance and take g = 9,8 m/s² calculate speed of the ball after 1sec.
The speed of the ball after one second is obtained as 9.8 m/s.
What is the speed after 1 second?We know that since the ball dropped from a height, its initial velocity is zero.
Thus we have;
u = 0 m/s
v = ???
g = 9,8 m/s²
t = 1sec
Given that;
v = u + at
v = at
v = 9,8 m/s² * 1sec
v = 9.8 m/s
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how to find the sum of a convergent series
The formula that can be used to obtain a convergent series is given by;
a/1 – r.
What is a series?In mathematics, we define a series as sum of numbers which could be convergent or divergent. In a convergent series, the summation of the numbers approaches a given value.
The formula that can be used to obtain a convergent series is given by;
a/1 – r.
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According to current evidence, Pluto is best described as ________. an escaped moon of Jupiter or Saturn a large member of the Kuiper belt a small jovian planet a terrestrial planet that is surprisingly far from the Sun
pluto is best decribed as smallest planet
5. In the image below, the focus lines are shown. What can be done to bring the apple into focus?
A. Make the lens rounder.
B. Make the lens flatter.
C. Move the apple farther from the eye.
D. Nothing should be done because the apple is already in focus.
In the image below, the focus lines are shown. The step can be done to bring the apple into focus is make the lens rounder. The correct option is A.
What is lens?
The lens is in spherical shape may be diverging or converging.
As light enters the eye, it is focused on the retina. Changing the pupil diameter, regulates the amount of light entering the eye. Changing lens shape will focus the light.
The changes in lens shape needed to maintain focus as the object distance changes.
Thus, the correct option is A.
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Would young rocks be found near a volcano?
Answer:
Yes, young rocks typically occur around volcanoes since they are closer to the crate, thus the magma is beginning to cool down to form rocks or it has recently cooled down.
Explanation:
yes
new forms of extrusive igneous rocks will be created as lava cooling and hardening will create new and young rocks
Select the correct answer.
Jack lives in a society where he has almost no political power. Governmental institutions handle all political, social, and economic affairs.
Which political system is this?
OA. totalitarianism
B. monarchism
C. democracy
D. chiefdom
Answer:A or totalitarianism
Explanation: Totalitarianism is an authoritarian form of government in which the ruling party recognizes no limitations whatsoever on its power, including in its citizens' lives or rights
Some characteristics of totalitarianism:
Rule by a single party.
Total control of the military.
Total control over means of communication (such as newspapers, propaganda, etc…)
Police control with the use of terror as a control tactic.
Control of the economy.
a sample contains 100 g of radioactive isotope. How much radioactive isotope will remain in the sample after 1 half-life?
Answer:
[tex]\huge\boxed{50g}[/tex]
Definition:
Half-life- The time taken for half of the radioactive isotopes to decay.
Explanation:
How does radioactive decay work? Radioactive decay is a process by which unstable nuclei become more stable through the emission of alpha or beta particles or gamma rays.
Since a half-life is the time taken for half of the isotopes to decay, we can simply divide the initial mass of 100 grams by 2; this gives us 50 grams.
1) Divide 100g by 2.
[tex]\frac{100g}{2}=50g[/tex]
give two examples of contact force and non contact force
Answer:
Explanation:
The two examples of contact forces are frictional force and applied force. The two examples of noncontact forces are gravitational force and magnetic force.
When your hand presses
down on scissors, what is your
force called?
a. input force
b. output force
c. buoyant force
Answer:
INPUT force
Explanation:
You are putting force into a machine of levers to have the output of cutting something.
When your hand presses down on scissors, the force is called input force because are applying a force into an object. Thus, option a is correct.
What is force ?Force is an external agent acting on a body to deform it or to change its state from rest or motion. There are various kinds of force such as magnetic force, nuclear force, gravitational force etc.
Force is a vector quantity thus, it is characterised by a magnitude and direction. According to second law of motion, the force acting on a body is the product of mass and acceleration.
Hence, the force acting on a body is directly proportional to the mass. Greater the mass, greater will be the force needed to accelerate the body. When we press down on an object we are applying an input force to the object.
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Which statement correctly describes mass-energy equivalence? All energy in the universe will be converted to an equivalent amount of mass. Mass can decrease in nuclear changes without the production of energy. All energy in the universe is a result of mass being converted into energy. A large amount of mass is equivalent to a small amount of energy.
The statement 'all energy in the universe is a result of mass being converted into energy' correctly describes mass-energy equivalence.
What is mass-energy equivalence?The expression mass-energy equivalence refers to the proportion of matter that can be converted into energy in the universe.
This mass-energy equivalence is an outcome of process of converting mass into energy.
In conclusion, the statement 'all energy in the universe is a result of mass being converted into energy' correctly describes mass-energy equivalence.
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Answer:
C
Explanation:
A student drops a water balloon out of a dorm window 17 m above the ground. What is its speed when it hits the ground?
7. Give reason: a. The motion of a bu's starting from a bus station is an example of non- uniform motion. how
Answer:
See below
Explanation:
It is a lot of stop and go....various speeds and accelerations .
