Answer:
IV family history of breast cancer or not.
DV chance of developing breast cancer. Hypothesis Someone with a family history of breast cancer will have a higher chance of developing it.
IV: Where the grass is placed: tree shade or direct sunlight.
Dv:The grasses growth rate
Hypothesis: Grass will grow faster in direct sunlight as opposed to tree shade
IV: Fresh veggies and fruit or not
Dv: how much the students eat: will they eat more or less?
Hypothesis The students will eat more in the lunchroom when Fresh veggies and fruits are served.
IV: The dog exercise everyday for 1 hour or not.
DV: The dogs barking: less or more.
Hypothesis: The dog will bark less when someone rings the doorbell if he exercises for 1 hour every day.
Explanation:
Observation When I wish my face before bed, I get less breakouts in the morning.
Question Does nightly face washing prevent morning breakouts?
IV Washing face at night or not
Dv How much breakouts in the morning.
Hypothesis Washing your face nightly decreases the occurrence of morning breakouts.
Which of the following exhibits different types of motion
a=motion of the earth
b=car moving on the road
c=motion of sewing machine
1. A car starts from rest and accelerates uniformly for 8.0 s. It reaches a final speed of 15
ms1
a. What is the acceleration of the car?
b. What is the average velocity of the car?
C. Calculate the distance travelled by the car.
Answer:
a. [tex]a=1.875\,ms^{-2}[/tex]
b. [tex]v_{0} =7.5\,ms^{-1}[/tex]
c. [tex]s=60\,m[/tex]
Explanation:
Given,
[tex]u=0\,ms^{-1}\,;[starts\,from\,rest]\\v=15\,ms^{-1}\\t=8\,s[/tex]
a. We know,
∴[tex]v=u+at\\=>15=0+a*8\\a=1.875\,ms^{-2}[/tex]
b. We know,
∴[tex]s=\frac{u+v}{2}*t\\=>s=\frac{0+15}{2}*8\\s=60\,m[/tex]
average velocity,[tex]v_{0} =\frac{s}{t}=\frac{60}{8}=7.5\,ms^{-1}[/tex]
c. From b, the answer is 60 m
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Which characteristic accounts for the fact that red lights in dark rooms and DO NOT expose negatives during developing?
Answer:
the long wavelength and not focused on the negatives.
I don’t know what to put in the boxes below
Answer:
What boxes are you talking abt?
why is electrostatic force able to act at a distance
who is the most genius scientist in the world
Answer:
Marie Curie
Explanation:
I hope to see you helped :D?
i need help asap!!!!!!!!
The Answer should most likely be A
Explanation:
you see B and C are pretty much the same but A has more weight and more wheels (sorry been a while sense I did this so I am calling the wheel and axel points what they look like to me) with having more wheels and axels and more weight it should have a higher force advantage.
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There are many variables that Maria and Elena must control so that their results will be valid. Name at least four of these variables.
Answer:
heyy
heyy
3
3
5
6
53
5
5
6546
3
4
5
6
6
53
3
4
6
65
4
5
6
5
5
5
6
6
4
4
5
5
5
The four variables that must be controlled for the results of Maria and Elena to be valid are
TemperatureAmount of lightHumidity Time.Variables in an experiment are those values that can change.
When conducting an experiment, there are usually different types of variables that are used and one of such is the Controlled variables.
The Controlled variables are known as those extraneous variables that can affect the results ( dependent variables) of an experiment. Therefore they should be held constant in order to obtain a valid result.
Examples of such controlled variables are Temperature, Amount of light,
Humidity and Time.
Take for instance, If the experiment conducted by Maria and Elena has to do with the rate at which an enzyme acts on different substrates. The temperature of the experiment needs to be constantly maintained to achieve a valid result.
This is because an increased temperature leads to increased rate of reaction between the enzyme and the substrate.
Therefore the variables that must be controlled for Maria and Elena results to be valid are the controlled variables which includes Temperature, Amount of light, Humidity, Time.
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hi pls answer 11 point pls
Answer:
the answer is a. a ball is moving towards the camera faster then slower
The graphic in the section "What Are The Steps In The Scientific Method?" shows a step between experimenting and drawing a conclusion. Based on the article, what is the explanation for this detail? (A) the need to include both dependent and independent variables in every experiment (B) the need to write down procedures carefully so others can carry out the same experiment (C) the need to repeat an experiment many times to test results before drawing a conclusion (D) the need to evaluate the meaning of the experiment's results before drawing a conclusion
There are several models that outlines the scientific method, which is
based on formulating an hypothesis to answer observed phenomena, and
testing the hypothesis to see if it is correct
The correct option for the explanation for the step between experimenting and conclusion is option D
(D) The need to evaluate the meaning of the experiment's results before
drawing a conclusion
The steps in the scientific method are designed to help solve existing
problems and they include;
Make an observation Ask a question or make a question statement based on the observationResearch and gather information background or existing sourcesHypothesis formulationTest or experiment design, performance and data collectionObservation and analysis of resultDraw conclusion; if hypothesis is true report result. If hypothesis is false, formulate another hypothesisReport resultThe step that comes between experimenting and conclusion is the
analysis of the experimental result to extract the information from the raw
experimental data, so as to evaluate the hypothesis and also the
procedure of the experiment. After the analysis, conclusion is drawn and
reported followed a new hypothesis is formulated or the existing
hypothesis is expanded upon, Therefore, the correct option is option D.
The need to evaluate the meaning of the experiment's results before
drawing a conclusion
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What is the derived SI unit for quantities of energy?
Answer:
m2·kg·s-2
Explanation:
this is the answ
A car moves with an average speed of 45 mph. How long does a car take to travel 90 miles?
Answer:
It took 2 hours
Explanation:
[tex]{ \bf{time = \frac{distance}{speed} }} \\ [/tex]
distance is 90 miles
speed is 45 miles per hour
[tex]t = \frac{90}{45} \\ \\ t = 2 \: h[/tex]
Answer:
2 hours
Explanation:
45 times 2 is 90
Which acid-base chemical reaction is irreversible?(1 point)
weak acid added to water
strong acid added to water
water on its own
weak base added to water
An irreversible reaction is a reaction that tends to completion. When a strong acid added to water, the reaction is irreversible.
In chemistry, a reaction may be reversible or irreversible. In a reversible reaction, the reaction could move forward or backwards. An irreversible reaction only tends towards completion. It doesn't goes in the reverse direction.
When a weak acid or base is added to water, the reaction is reversible because the substance does not ionize to a large extent in water and the equilibrium position may lie towards the far left. However, a strong acid or base achieves 100% ionization in water hence the reaction is irreversible.
Therefore, when a strong acid added to water, the reaction is irreversible.
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Answer:
1. strong acid added to water
2. The dissociation constant for hydrochloric acid is greater than the dissociation constant for acetic acid.
3. HA, HC, HB
4. decreasing the concentration of OH– ions
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Divergent plate boundaries are when plates
collide
move past each other
move apart
Explanation:
Move past each other.
Have a good day.
Burger Hut is trying to decide if it can receive money from the government for providing employees with insurance. Financial accounting or Management Accounting or Tax Accounting
We have that with these disciplines well defined, The Form of accounting that speaks the most Burger Huts situation is the discipline of Management Accounting
Firstly we define the Disciplines of Accounting below
Financial accounting
Financial Accounting, this is a branch of accounting that focuses mainly on the Recording,Encapsulating or Summing up and then Releasing a statement bearing the Affairs of a Business over a specific time frame.
Management Accounting
This Branch of accounting focuses on the use of existing Financial positions to make assessment of a business and determine the best way to move the business forward.
Tax Accounting
This is a branch of accounting that focuses on taxation.This branch is governed by stiff rule that ensure that business stay in check.
Therefore
With these disciplines well defined, The Form of accounting that speaks the most Burger Huts situation is the discipline of Management Accounting
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A cat runs 80 meters to the left in 16 seconds, then 50 meters to the right in 10 seconds, then 70 meters to the left in 14 seconds, then 40 m to the right in 8 seconds.
a. What was the distance travelled by the cat?
b. What was the displacement of the cat?
c. What was the average speed of the cat?
d. What was the average velocity of the cat?
Explanation:
a) Distance ➤ (80+50+70+40) m. ➤ Distance= 240m.
b) Displacement ➤ (50+40)m. ➤ Displacement= 90m
c) Average Speed ➤ Total distance travelled/total time taken
➤ 240/48
➤ 5 [tex]ms^{-1}[/tex]
d) Average Velocity ➤ Total displacement/total time taken
➤ 90/48
➤ 1.875 [tex]ms^{-1}[/tex]
1. Choose the correct answer 1. Casparian strips are present in the of the root. a) cortex b) pith c) pericycle d) endodermis 2. The endarch condition is the characteristic feature of a) root c) leaves b) stem d) flower
Answer:
1 casparian strips are present in the root of endodermis.
2 the endarch condition is the character fature of stem.
A piano technician slides a Steinway grand piano across a level floor at Carnegie Hall. The piano has a mass of 490 kg.
(a) Draw a free-body diagram, and calculate the normal force supporting the piano.
(b) If the coefficient of static friction between the floor and the piano is 0.35, calculate the minimum amount of force needed to get the piano to move.
(c) Once the piano is moving, a horizontal force of 1.1 x 10²N is necessary to keep it moving at a constant speed. Determine the coefficient of kinetic friction.
We have that the normal force is given as [tex]F_N=4802N[/tex],while the minimum amount of force needed to get the piano to move to be [tex]F_f=1680.7N[/tex] and
Coefficient of kinetic friction as [tex]\mu_k=0.23[/tex]
A) [tex]F_N=4802N[/tex]
B) [tex]F_f=1680.7N[/tex]
C) [tex]\mu_k=0.23[/tex]
From the question we are told that:
Mass [tex]m=490kg[/tex]
A)
Generally, the equation for normal force is mathematically given by
[tex]F_N=mg[/tex]
[tex]F_N=(490kg*9.81)[/tex]
[tex]F_N=4802N[/tex]
B)
From the question we are told that:
Coefficient of static friction [tex]\mu=0.35[/tex]
Generally, the equation for Frictional Force is mathematically given by
[tex]F_f=\mu mg\\\\F_f=4802*0.35[/tex]
[tex]F_f=1680.7N[/tex]
C)
From the question we are told that:
Horizontal force [tex]F_h =1.1 * 10^2 N[/tex]
Generally, the equation for coefficient of kinetic friction is mathematically given by
[tex]\mu_k=\frac{F_h}{mg}[/tex]
[tex]\mu_k=\frac{1.1 x 10^2}{4802}[/tex]
[tex]\mu_k=0.23[/tex]
Therefore in conclusion
the normal force is given as [tex]F_N=4802N[/tex],while the minimum amount of force needed to get the piano to move to be [tex]F_f=1680.7N[/tex] and
Coefficient of kinetic friction as [tex]\mu_k=0.23[/tex]
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Help with the question I know this question is simple but i am weak in physics
Answer:
F = G M1 M2 / R^2
R^2 = G M1 M2 / F
R^2 = 6.67 E-11 * 6.78 E26 * 5.42 E20 / 8.6 E10
R^2 = 6.67 * 6.78 * 5.42 / 8.6 * E25
R^2 = 28.5 * E25 = 2.85 * E26
R = 1.69 E13 m
A car with a mass of 1200kg is travelling at 72kmh^-1 when the driver sees a dog running across the street. He applies the brakes and 10 seconds later the car is moving at 18kkmh^-1.
A) Calculate the initial momentum of the car.
B) Calculate the final momentum of the car.
C) Calculate the change in momentum of the car.
D) Calculate the net force applied by the brakes of the car.
Please find attached photograph for your answer. Please do comment whether it is helpful or not.
the forces which hold molecules in a water drop are called choose surface tension adhesive or cohesive forces yessfgb
Answer:
Cohesion
Explanation:
Cohesion is the force responsible for holding the molecules of water together.
Adhesion is type of force between two different molecules or compounds.
Surface tension allows water molecules or molecules to resist any external force "due" to cohesive forces.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Peace!When moving across a period from left to right in the periodic table, excluding transition elements, which trend occurs?(1 point)
Valence electrons increase by one.
Valence electrons decrease by one.
The energy levels increase by one.
The energy levels decrease by one.
Answer:
Valence electrons increase by one
The 'Periodic Table' is characterized as the 'tabular representation of chemical elements as per their atomic number in order to keep the elements possessing similar properties in a single group.'
In case one moves towards right from left in this table except for the transition elements, the trend that occurs would be:
A). Valence electrons increase by one.
'Valence electrons' are described as 'any of the electrons that are present in an atom's outermost shell.' These are the electrons that possess the ability to develop bonds with other present atoms. The valence electrons present increase by one unit to maximum of 4 units in the period if we move from the left towards the right leading to an enhanced charge on the nucleus.Thus, option A is the correct answer.
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I need some help please this is really mixing me up.
The gravitational force F between two bodies of masses M and m, separated by a distance R, has a magnitude of
F = GMm/R ²
We're given that
F₁ = Gm₁m₂/r ²
and
F₂ = G (2m₁) (4m₂)/(2r )²
Now,
F₂ = G (2m₁) (4m₂)/(2r )²
F₂ = 8/4 Gm₁m₂/r ²
F₂ = 2 Gm₁m₂/r ²
F₂ = 2 F₁
so n = 2.
a string with fixed ends is made to go into standing wave patterns. at a given tension, the lowest frequency for which a certain pattern exists is 150 Hz. which of the following frequencies would also cause a standing wave pattern in this case?
Answer:
700 hz
Explanation:
How many marbles would fit in beta Centauri?
Answer:
dude if any body could answer that they deserve a Nobel prize because the formula to solve that would require the exact measurement of hadar or as commonly known beta centauri
Explanation:
what is the difference between the two reactions that can occur during radioactive decay?
1.If a wooden cube has length and breadth of 1.5 m each and it is exerting a pressure of 1200 pa. What is it's weight (f)?
Explanation:
Explanation:
Pressure is defined as a Force over an
Area.
p=F/A
We can rearrange this to make the Force
the subject
F = p *A
The pressure is given as 1200 Pa.
We know a pascal is 1 Newton / Square
metre = N/m²
The area of a cube will be width * breadth
= 1.5 m * 1.5 m= 2.25 m²
So the force the cube is pushing down
with (its weight) is simply
F = p * A = 1200 N/m² * 2.25 m² = 2700 N
Weight is officialy defined as a force
measured in Newtons, but when we
talk about weight we often give it in
Kilograms (a unit of mass).
To get the weight in units of
Kilogram-force you must divide by the
gravitational acceleration =9.81 m/s²
2700 / 9.81 = 275.23 Kg
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If the cell below is an animal cell, where does the new pomi to
di cell membrane
) nucleus
(1) evtoplam
(4) cell wall
A car is moving with a speed of '20" "m//s' , after applying the break it has come to rest after 10 seconds. What is its acceleration?
According to the graph the acceleration of the object is ?
A) Constant
B) decreasing
C) increasing
D) zero
Answer:
your answer is (B) decreasing
I hope it's helps you