Answer:
57.3N
Explanation:
Given parameters:
radius of the path = 3m
tangential speed = 2m/s
mass of the bicycle and child = 43kg
Unknown:
centripetal force = ?
Solution:
The centripetal force is the inward force on a body round a circular path.
It is expressed as;
F = [tex]\frac{mv^{2} }{r}[/tex]
F is the centripetal force
m is the mass
v is the tangential speed
r is the radius
F = [tex]\frac{43 x 2^{2} }{3}[/tex] = 57.3N
A polar bear runs at a speed of 11\,\dfrac{\text m}{\text s}11 s m 11, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with 23,000\,\text J23,000J23, comma, 000, start text, J, end text of kinetic energy.
Answer:
380.1 kg
Explanation:
PLEASE HELP ME
A motor takes 2,280 Joules of electrical energy and turns it into 1,606 Joules
of useful kinetic energy and 550 Joules of wasted thermal energy and sound.
Calculate the efficiency of the motor in percent.
Given that,
Electrical energy of the motor = 2280 J
Kinetic energy = 1606 J
Wasted energy in thermal and sound energy = 550 J
To find,
The efficiency of the motor in percent.
Solution,
Efficiency is defined as the ratio of useful output energy to the total energy.
Total energy = 2280 J
Useful energy = 1606 J
[tex]\eta=\dfrac{1606}{2280}\times 100\\\\=70.43\%[/tex]
So, the efficiency of the motor is 70.43%.
The formula AM → A + B represents what type of chemical reaction?
Answer: Decomposition reaction.
Explanation:
Decomposition is a type of chemical reaction in which one reactant forms two or more than two products.
Decomposition reactions require breaking of bonds which require energy and thus all of the decomposition reactions are endothermic reactions. They require energy in the form of heat, electricity or sunlight and thus called as thermal, electrolytic and photolytic decomposition respectively.
The given reaction [tex]AB\rightarrow A+B[/tex] is a type of decpomposition reaction.
How much momentum does a moving object have
If a paper airplane has a forward velocity of 2 m/s, but air resistance has a velocity of 1 m/s acting against the paper airplane, then what is the resultant forward velocity of the paper airplane?
Answer:
F_{resultant} = 1 [m/s]
Explanation:
These types of problems can be solved by means of relative velocities, where vectors (forces or velocities) are necessarily handled, these velocities depending on the velocity are added or subtracted.
Forces to the right are taken as positive and negative to the left.
[tex]F_{velocity}-F_{air}=F_{resultant}\\2-1 = F_{resultant}\\\\F_{resultant} = 1 [m/s][/tex]
a sports car moving at constant speed travels 110 m in 5.4 s , then brakes and comes to a stop in 3.7 s .
The sports car moving at constant speed that travels 110 m in 5.4 s , then brakes and comes to a stop in a time of 3.7 s, have an acceleration of: -5 m/s²
The formula and procedure we will use to solve this exercise is:
v = x/ta = (vf - vi) /tWhere:
x = distancet = timev = velocityvf = final velocityvi = initial velocityt = timea = accelerationInformation about the problem:
xi = 110 mti = 5.4 svi=?vf = 0 m/st = 3.7 sa=?Applying the velocity formula we get the (vi):
v = x/t
vi = 110 m / 5.4 s
vi = 20.37 m/s
Applying the acceleration formula we have:
a = (vf - vi) /t
a = (0 m/s - 20.37 m/s) /3.7 s
a = (-20.37 m/s) /3.7 s
a = -5 m/s²
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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2 When a cube of hot metal is placed in a beaker of cold water, the temperature of the water -
A) decreases
B) increases
C) remains the same
D) none of the above
A rock dropped off a bridge takes 5 seconds to hit the water. Which of the following best represents the rock's speed just before impact?
The rock's speed just before impact is 49 m/s and it will be the maximum speed of the rock.
What is the rock's speed before the impact?
The velocity of the rock before the impact is the final velocity of the rock and it depends on the initial velocity of the rock, time of motion and acceleration due to gravity.
The speed of the rock before the impact is calculated as follows;
v = u + at
where;
v is the final velocity of the rocku is the initial velocity of the rockt is the time of motiong is acceleration due to gravitySubstitute the given parameters and solve for the final velocity.
v = 0 + 9.8 m/s² x 5 s
v = 49 m/s
Thus, the rock's speed just before impact is 49 m/s and it will be the maximum speed of the rock.
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Please help me with this!!
Answer:
5 kgExplanation:
∑Fx = 0
F1 + F2 = 0
-12 + 2 = -10
force acting against the block is Fx = 10N to the right.
Force = mass * acceleration
where acceleration = 2.0 meters per second.
force = 10 N
mass = ??
plugin values into the formula:
10 = mass * 2.0
mass = 10 / 2.0
mass = 5 kg
mass on the block = 5kg.
ill give you points if you answer this question
FOR EACH QUESTION I NEED ORIGINAL SENTENCES AND A FACT TOO
PLSS I REalll need help cus its due todayyy
how is animal testing unreliable and wasting time and money?
how is it cruel to the animals that are forced to be test subjects....
how its affecting the earth with chemicals that is exposed to
Need thy help once again
A 100-kilogram bowler throws a 10-kilgram ball to the right with a force of 20 Newtons. What is the force that the ball applies to the bowler?
Question 8 options:
20 N to the right
20 N to the left
2 N to the right
200 N to the left
a sample of oxygen gas occupies a volume of 25.0ml at 740.0 torrent what volume will occupyat 800.0 torr
Answer:
23.1mL
Explanation:
Given parameters:
Initial volume of the gas = 25ml
Initial pressure = 740torr
Final pressure = 800torr
Unknown:
Final volume = ?
Solution:
To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant"
P₁ V₁ = P₂ V₂
P and V are pressure and volume
1 and 2 are initial and final states
Insert the parameters and solve;
740 x 25 = 800 x v₂
v₂ = 23.1mL
i really need help on this question
In 1-2 complete sentences, summarize how the frequency of a wave is measured.
thank you if you were able to help :)
Answer: Wave frequency can be measured by counting the number of crests (high points) of waves that pass the fixed point in 1 second or some other time period. The higher the number is, the greater the frequency of the waves. The SI unit for wave frequency is the hertz ( Hz ), where 1 hertz equals 1 wave passing a fixed point in 1 second.
Explanation:
A runner is jogging in a straight line at a steady vr= 7 km/hr. When the runner is L= 7.6 km from the finish line, a bird begins flying straight from the runner to the finish line at vb= 28 km/hr (4 times as fast as the runner). When the bird reaches the finish line, it turns around and flies directly back to the runner.
What cumulative distance does the bird travel? Even though the bird is a dodo, assume that it occupies only one point in space (a “zero” length bird), travels in a straight line and that it can turn without loss of speed.
Answer in units of km.
After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again, and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line. How far does the bird travel from the beginning (including the distance traveled to the first encounter)?
Answer in units of km.
Answer:
See answers below
Explanation:
Rate of runner 7 km/hr
Bird = 28 km/ hr
TIME bird flies to finish line 7.6 km / 28 km/hr
the runner covers distance in this time :
7.6 / 28 * 7 km = 1.9 km
this leaves 7.6 - 1.9 km = 5.7 km to the finish
..... the bird turns around
now the two have a closing speed of 28 + 7 = 35 km/hr to cover
this 5.7 remaining km
time to meet = 5.7 km / 35 km/hr = .16285 hr
so the bird flies at 28 km/ hr for this remaining time
= 4.56 km added to the original 7.6 km before turning around = 12.16 km
Total time for the runner to finish 7.6 km / 7 km/hr = 1.086 hr
the bird is flying at 28 km/hr for this entire time = 30. 4 km
what is the commonality of t-bars, a framework of steel or metal channels suspended by wires, and pre-cut acoustic tiles?
T-Bars outside of major construction projects is as supports for a dropped ceiling.
What are T bars in a building?A flat metal plate at the bottom of a ribbed "T"-shaped bar that is driven into the ground. usually used to identify the locations of a water meter pit and chain link fence posts.
What is a metal bar called?Metal bar stock is the same way. Round bar (also known as rod), rectangular bar (including square bar, the exceptional case with equal sides), and hexagonal bar are the three most used shapes (usually called hex bar for short).
What are the metal bars on a bar for?Although it might seem out of place at the bar, this metal rail has a useful purpose. A few Reddit users described the purpose of the service bar rail, which separates clients from the area where drinks and employees enter and exit the establishment.
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how do the most common forms of energy work?
Answer:
activity 2
Explanation:
Amir asks a coworker, “Are you feeling a little nervous about making your first big presentation? I remember how that feels. I was scared.” What is Amir offering his coworker?
A.
end results
B.
ethics
C.
empathy
D.
external training
Answer:
C - empathy
Explanation:
Empathy is seeing a situation from someone else's point of view or putting yourself "in their shoes." Not sure how this one is physics but that's ok :)
Jay and Jeff were responsible for recording the class weather data each day in March. This particular morning, they used the sling psychrometer seen here. What data did they record with the sling psychrometer?
A. The wind speed is 3 miles per hour.
B. The air pressure is holding steady.
C. The relative humidity is thirty-five percent.
D. The air temperature is 22℃
The relative humidity is thirty-five percent is the data in which the sling psychrometer will record and is denoted as option C.
What is Relative humidity?
This is defined as the amount of water vapor which is present in air and is usually expressed as a percentage of the amount needed for saturation at the same temperature.
The instrument known as psychrometer is commonly used by scientist to measure the relative humidity of a given area and it does this by taking both a wet-bulb and a dry-bulb temperature reading which is then used to calculate the relative humidity of the given area.
Thus is done using computation tools or the use of psychrometric chart in other to read the results for the required accuracy needed which therefore makes it the most appropriate choice in this scenario.
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Jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there. Which observations most likely led to Jenna’s conclusion?
Explanation:
A chemical change is one in which a new kind of matter has formed. It involves chemical reactions occurring within a given substance. For the mashed potato, some of the observations might be;
Turning into liquid of the mashAlso, the process cannot be reversedThere might have been a mass changeThe odor comes from the new products that are formed which is from a gas released from the decomposition of the mashed potato.Manu took a pebble and a sheet of paper both weigh one gram. His friend told that if we drop both at the same time, the pebble will fall straight to the floor, while the paper will slowly drift to the ground. Do you think friction have any role in this case? How can we relate that to the topic which we are learning today?
Answer: friction has no role to play in this case. because friction usually occurs between to parts which come in contacts. examples (a)our joints in the human body (b)two mechanical parts (shafts).
Explanation:
However what this topic relates to is gravity. The pebble and paper both weigh one gram, but have different density this is the sole reason why if both are drop from same height the pebble would reach the ground faster than the paper because it is more denser. unlike the paper with a lesser density which would take a longer time to reach the ground.
How many moles of mercury, Hg is in a sample of 505 grams?
Answer:
2.52moles
Explanation:
The amount of substance, measured in miles, can be calculated using the formula:
Number of moles = mass ÷ molar mass
According to the information in this question; mass of Mercury (Hg) = 505g, molar mass (MM) of Hg = 200.59g/mol
Hence, using mole = mass/MM
mole = 505/200.59
mole = 2.5175
mole = 2.52moles
When an object oscillating in simple harmonic motion is at its maximum displacement from the equilibrium position. What are its of the values of its speed and the magnitude of the restoring force?( in term of maximum, minimum and zero)
Answer:
Speed = 0
Restoring force = maximum
Explanation:
Suppose this situation as a spring with a mass attached to it, that oscilates.
The force that the spring does (the restoring force in this case) is something like
F = K*L
where K is the constant of the spring, and L is the difference between the length of the spring (stretched) and the length of the spring at rest.
Then, when the harmonic oscillator is at its maximum displacement, L takes its maximum value, which means that at this point the restoring force must also have a maximum.
And for the velocity, at this point we have the maximum displacement, this means that, if the mass was moving to the right, after this point the mass stops going to the right, and then returns to the equilibrium position to the left.
Then the velocity has a change of sign, (like an object that reached its maximum height) this means that at that exact moment, the velocity must be zero.
Then:
Speed = 0
Restoring force = maximum
(5) A 4 kg. object rests on a flat, horizontal surface with a static
coefficient of friction of 0.25. What minimum force will be necessary to
start the object in motion? If the coefficient was smaller, what effect would
that have? If it was larger?
Answer:
F = 9.81 [N]
Explanation:
To solve this problem we must use Newton's third le which tells us that the sum of forces on a body that remains static must be equal to one resulting from these forces in the opposite direction.
Let's perform a summation of forces on the vertical axis-y to determine the normal force N.
∑F = 0 (axis-y)
[tex]N - m*g = 0[/tex]
where:
m = mass = 4 [kg]
g = gravity acceleration = 9.81 [m/s²]
[tex]N - (4*9.81)=0\\N = 39.24 [N][/tex]
Now we know that the frictional force can be calculated using the following equation.
f = μ*N
where:
f = friction force [N]
μ = friction coefficient = 0.25
N = normal force = 39.24 [N]
Now replacing:
[tex]f = 0.25*39.24\\f = 9.81[N][/tex]
Then we perform a sum of forces on the X-axis equal to zero. This sum of forces allows us to determine the minimum force to be able to move the object in a horizontal direction.
∑F = 0 (axis-x)
[tex]F-f=0\\F-9.81=0\\F= 9.81[N][/tex]
If the coefficient was smaller, a smaller force (F) would be needed to start the movement, this can be easily seen by replacing the value of 0.25, by smaller values, such as 0.1 or 0.05.
If the coefficient were larger, a larger force would be needed.
what are the main morphological types of galaxies, and what is the difference in their rotation patterns?
The main morphological types of galaxies are elliptical, spiral, and irregular.
Based on their morphology , galaxies have been classified into 3 types namely elliptical, spiral, and irregular.
These galaxies have various sizes and shapes ranging from dwarf galaxies to giant galaxies.
Elliptical Galaxy:
The shape of it is generally circularThese are the largest among all the types of galaxies because according to astronomers, it is formed by the merger of other small galaxies.Their rotational pattern is symmetric.Spiral Galaxy:
A spiral galaxy consists of a bright nucleus surrounded by a thin outer disk forming a spiral shape.This type of galaxy is the most common in our universe.It is divided into three classes: Spiral a, Spiral b, and Spiral c. Their rotational pattern has circular symmetry.Irregular Galaxy:
These types of galaxies have no central nucleus and irregular arms which are bluish.They don’t have any rotational symmetry.To know more about "galaxies", refer to the following link:
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Question 2 of 10
Which illustration represents low accuracy and low precision?
Answer:
D is the correct answer
Explanation:
A) shows low accuracy and high precision since they missed the bull's-eye but are all grouped together.
B) Shows high accuracy and high precision
C) Shows high precision
D is the only one that shows both low accuracy and low precision
The illustration represents low accuracy and low precision is according to option D.
What is accuracy?When in an experiment, a value is measured 5 times, then if the values measured are same for most of the time or like three times out of five, it said to be accurate. The phenomenon is accuracy.
Precision is about comparing the values to each other then find them near to each other.
Accuracy compares the experimental value to the theoretical value.
So, when all the values are close to each other but not nearest to the theoretical value, then it is said to be precise but not accurate.
Thus, the correct option for low accuracy and precision is D.
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What must be known to determine the direction of the magnetic force on a charge? Check all that apply.
O the type of the charge
O the amount of the charge
O the direction of the magnetic field
O the velocity of the charge
O the strength of the magnetic field
What must be known to determine the direction of the magnetic force on a charge? Check all that apply.
A- the type of the charge
B- the amount of the charge
C- the direction of the magnetic field D- the velocity of the chargeE- the strength of the magnetic field
To determine the direction of the magnetic force :
A) The type of the charge.
C) The direction of the magnetic field.
D) The velocity of the charge.
Magnetic ForceTo determine the direction of the magnetic force on a charge is the type of the charge, the direction of the magnetic field, and the velocity of the charge.
The magnetic force, attraction or repulsion that emerges between electrically charged particles since of their movement.
It is the fundamental constrain dependable for such impacts as the activity of electric engines and the fascination of magnets for press.
Thus, the correct answer is A, C and D.
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Explain why people who use the drug in the following scenario might have potential health risks.
Steve is a principal investigator at Live Pharmaceuticals, Inc., and is working on a new drug. He tells a coworker, “Never mind the exact content of the essential ingredient. The ingredient quality does not matter. Just ensure the drug doesn’t exceed the weight limit.”
Answer:
People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does
Explanation:
Answer:
People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does
Explanation:
Is this statement true or false?
Line spacing refers to the amount of space between each line in a paragraph.
true
false
Answer:
True
Explanation:
I just took the test and got 100
inkjet printers use electrical charges and heat to fuse tiny plastic particles (called toner) to the paper.
How a Inkjet printer uses electrical charges and tiny particles to print the image is discussed below.
We have a Inkjet printer which uses electrical charges and heat to fuse tiny plastic particles (called toner) to the paper.
What are Electrical Charges?The sufficiency or deficiency of electrons in a body leads to the development of electric charge in a body. Its unit is Coulomb. It can be either Positive or Negative in nature.
According to the question -
The statement mentioned in the question is true. The inkjet printers use electrical charges and heat to fuse tiny plastic particles (called toner) to the paper. Printers attract toner particles (with the help of electric charge) to a transfer roller. Toner particles are pressed onto a piece of paper, while heat and pressure from the fuser unit permanently fix the image onto the page.
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The most soaring vocal melody is in Johann Sebastian Bach's Mass in B Minor. In one section, the basses, tenors, altos, and sopranos carry the melody from a low D to a high
A. In concert pitch, these notes are now assigned frequencies of 146.8Hz and 880.0 Hz . Find the wavelengths ofFind the displacement amplitudes of(f) the final note.
The wavelength of the displacement amplitudes is 124cm.
What is wavelength?Frequency is the distance between two pinnacles (or box) of a wave and is consequently estimated in meters. Because of waves coming in all shapes and sizes, the prefix related with meters can change decisively from km for radio waves, micrometers for noticeable light (albeit frequently given in nanometers), to picometers for gamma beams. Albeit X-beams have numerous useful applications, utilizing them requires alert since openness can cause visual impairment, disease and different wounds. Frequency and recurrence are conversely related so that more drawn out waves have lower frequencies, and more limited waves have higher frequencies.
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