Answer:
0.144
Explanation:
Impulse is defined as force multiplied by time
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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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Question 6 (3 points)
(03.01 MC)
The fossils found in the different layers of Earth are listed below.
Top layer: Fossil A
Bottom layer: Fossil B
Second layer from top: Fossil C
Third layer from top: Fossil D
Which fossil is the oldest? (3 points)
Oa
Fossil A
Fossil B
Fossil C
Fos
d
Answer:
fossil c
Explanation:
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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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:
A body is under the action of two forces 7 newton and 10 newton. Find the resultant of the two forces if the forces are parallel and act in the same direction
The resultant of the two forces is is 17 N.
We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as
R = F1 + F2 + ... + Fn
where R is force resultant (net force)
From the question above, we know that
F1 = 7 N
F2 = 10 N
Because the direction is the same, the force will add to each other.
R = F1 + F2
R = 7 + 10
R = 17 N
Hence, the net force is 17 N
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what are two conditions of equilibrium? write them in word
What happens to a cell in an hypotonic solution?
Answer:
★ In a hypotonic solution, the solute concentration is lower than inside the cell. If the water continues to move into the cell, it can stretch the cell membrane to the point the cell bursts (lyses) and dies.
Explanation:
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broglie wavelength of a 231 gg baseball with a speed of 34.0 m/sm/s ? express your answer in meters.
The broglie wavelength is 9.27 x 10¯³⁵ meter.
We need to know about de Broglie's wavelength to solve this problem. Broglie's wave equation is the following :
λ = h / (m.v)
where λ is the wavelength, h is Max Planck constant 6.62x10⁻³⁴ J.s, m is the mass and v is velocity.
From the question above, we know that:
m = 231 gram = 0.231 kg
v = 34 m/s
By substituting the parameter, we get :
λ = h / (m.v)
λ = 6.62x10⁻³⁴ / (0.21 x 34)
λ = 9.27 x 10¯³⁵ m
Hence, the broglie wavelength is 9.27 x 10¯³⁵ meter.
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Answer:
v = u +at
Explanation:
The equation that relates the final velocity and the average acceleration is written as follows :
v = u +at
Where
v is final velocity
u is initial velocity
a is acceleration
t is time
This equation is valid when the motion is with constant acceleration.
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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A 1000 kg car moves with a constant speed 20.0 m/s
around a flat circular track of radius 30.0 m. What is the
centripetal acceleration of the car?
Answer:
13.33 m/s^2
Explanation:
Velocity^2 then divide that by the radius
You are designing a new home for a cold climate. You want one room in the
house to be warmed by the Sun's energy. Which material would be best to use
for absorbing energy from electromagnetic waves that have entered the
room?
A. A mirror
B. Clear glass
C. A shiny metal
D. Dark fabric
Answer:
D. Dark fabric
Explanation:
A dark fabric would be the best and most desired material for designing the new home to absorbed energy from the sun.
A black body is a good absorber of thermal radiation or heat energy from the sun. It is a perfect absorber and does not allow the energy to seep out. A shiny metal is a good reflector. It does not absorb thermal energy and therefore, it is not a good material to design the house.Dark fabric is the material would be best for absorbing energy from electromagnetic waves.
What is Energy?This is defined as the ability or capacity to do work and is present in sources such as electromagnetic waves.
Dark surfaces absorb energy while lighter surfaces don't which is why option D was chosen as the most appropriate choice.
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estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1- km/h speed, has a 0.5- m width, and a field is 360 ft long and 160 ft wide. 1 m
The calculated time taken is 10.7 hours
Given that our speed is 1 km/h and our width is 0.5 m, we can mow a path that is 0.5 m wide and 1000 m long in an hour, covering a total area of 1000 m * 0.5 m = 500 m2/hr.
Let's now determine the size of that football field.
5350.692864 m2 is equal to 360 ft / 3.281 ft/m plus 160 ft / 3.281 ft/m.
To determine how many hours it will take, divide that area by the 500 m2 that was previously determined.
500 m2/hour / 5350.692864 m2
= 10.70138573 hr
In other words, moving the football field would take around 10.7 hours.
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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
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
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
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]
How do sound waves travel?
Sound waves radiate outward from a central point.
Sound moves randomly in different directions.
Sound causes the air near it to vibrate inwards.
Sound transforms waves into different frequencies.
please give right answer!
Answer:
Sound waves move by vibrating objects and these objects vibrate other surrounding objects, carrying the sound along. The further away from the original source of a sound you are, the waves lessen until they don't have the strength to vibrate any other particles.
Explanation:
calculate the displacement and velocity of a ball 0.50 seconds after it is thrown straight up with an initial velocity of 15.0 m/s. take the point of release to be an initial height of zero.
Answer:
The ball will have a displacement of 0.5*15.0=7.5m after 0.5 seconds. The velocity of the ball will be 15.0 m/s, since it is not acted on by any forces except gravity (which acts in the direction opposite of the velocity).
Explanation:
We know this is the answer because, according to the kinematic equation:
v^2=u^2+2*a*d
0=15.0^2+2*(-9.8)*d
d=-7.5m
Which forms of heat transfer require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer.
Conduction
Convection
explanation.
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.
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:
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.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.
Which of the following actions is an example of an improvement in human capital?
A
Michelle applies for a job as a mechanical engineer at Honeywell.
B.
Marcus hires three workers for his thriving electrical business.
C.
Hawk Builders of Phoenix builds two new hospitals.
D.
Frank's Furniture trains all of its employees to use computers.
Answer: D
Explanation:
Frank’s Furniture trains all of its employees to use computers is an example of an improvement in human capital.
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 :)
An object of known mass that can be used to establish uncertainty in measurements made with a balance is best described as a.
According to the graphic, the weighing balance has a hundredth-place level of uncertainty.
What is a balance?The characteristic of matter that gauges its resistance to acceleration in physics. An object's mass can be thought of as a rough count of its atoms.
Any tool that measures an object's mass or weight is referred to as a balance. Every laboratory needs balance as an essential tool.
In the hundredth position, there is uncertainty. There are always three significant figures for a mass that is between 1 gram and 9 grams when it is measured on this balance.
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Help! How do you find the Eccentricity??
Explanation:
The formula to determine the eccentricity of an ellipse is the distance between foci divided by the length of the major axis
What unite do scientists use to measure force
A) Newton
B) grams
C) meters
D) meters per second per second
how do the most common forms of energy work?
Answer:
activity 2
Explanation: