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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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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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?
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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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:
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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help me please i dont understand
Answer:
inertia is due to friction
who is the most genius scientist in the world
Answer:
Marie Curie
Explanation:
I hope to see you helped :D?
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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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 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]
After 14.1s, a jogger's displacement is 520m. What is the average velocity in km/h
The average velocity in km/hr is 132.99km/hr
The first step is to convert 14.1 secs to hours
14.1/3600
= 0.00391 secs
Convert 520 m to km
520/1000
= 0.52 km
Velocity= displacement/time
0.52/0.00391
= 132.99km/hr
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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]
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~AH1807Peace!Which types of changes must follow the law of conservation of mass?
Both physical and chemical changes
Neither physical nor chemical changes
Only physical changes
Only chemical changes
Answer:
Both physical and chemical changes
Answer:
Both physical and chemical changes follow the law since when the system is closed to all transfers of matter and energy, the mass of the system must remain constant over time, irrespective of the state.
Explanation:
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Class 9 SCIENCE
ch 2 Is matter around us pure
Question -
what you mean by crystallization? Give example.
Answer:
Crystallization is defined as a process by which a chemical is converted from a liquid solution into a solid crystalline state.
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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True or false? Balanced forces cause a change in motion. T/F
How do you know this?
Help me, it's due soon!
Balanced forces do not change the motion of an object, Because the forces are the same size and acting in opposite directions.
Answer:
Balanced forces do not change the motion of an object. The motion of an object will not change if the forces pushing or pulling the object are balanced. An object that is sitting still will stay still if the forces acting on it are balanced.
define physical quantity
Answer:
The quantity which can be measured is called physical quantity.
Answer:
Those quantities which can be measured are called physical quantities.
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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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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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.
34.1 grams / 1.1 mL =
General formula,
→ 1 mL = 1 gram
The given question is,
→ 34.1 grams / 1.1 mL = ?
According to the formula,
→ 34.1 grams / 1.1 grams
→ 34.1 ÷ 1.1
→ 31 grams
The answer is 31 grams.
plzz can anyone solve this
plzzzz guys tomorrow is my exam ..
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Answer:
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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
10th grade Physical Science.... Help plss
1.) Which option is a negatively charged ion?
A) chloride
b) chlorate
c) chlorite
d) chlorine
2.) When moving across a period from left to right in the periodic table, excluding transition elements, which trend occurs?
a)Valence electrons increase by one.
b)The energy levels increase by one.
c)Valence electrons decrease by one.
d)The energy levels decrease by one.
3.) Which information about an atom can a period number give you?
a)the number of valence electrons it has
b)the ionic charge it forms
c)how many bonds it will make
d)how many energy levels it has
4.) Fluorine has 7 valence electrons. Which charge is its ion likely to have?
a)5+
b)1–
c)5-
d)1+
5.)Which two elements in the list would bond together based on their ionic charges?
a)calcium and potassium
b)potassium and iodine
c)calcium and neon
d)potassium and neon
Use the list to answer the question.
potassium, Group 1
calcium, Group 2
iodine, Group 17
neon, Group 18
The periodic table is an arrangement of elements into groups and periods based on their periodic properties. Elements a placed in these groups and periods.
1) A negatively charged ion is chloride
2) Moving from left to right, valence electrons increase by one.
3) The period number gives information about how many energy levels it has
4) Fluorine has a charge of 1–
5) Potassium and iodine form an ionic bond.
In the periodic table, elements are arranged in groups and periods. There are 18 groups and 8 periods.
Chlorine is in group 17, there have seven outermost electrons hence the chlorine atom needs only one more electron in order to attain a stable octet. This is done by accepting one electron to form the negatively charged chloride ion.
As we move from one period to another, one extra electron is added to the outermost shell of elements. Hence, the valence electrons increases by one.
The period to which an element belongs shows you the number of shells or energy levels in the atom of that element.
Fluorine is in group 17. One electron is needed to achieve a stable octet. When an atom accepts one electron, its charge is 1–.
Bonding based on ionic charges occurs between metals and nonmetals. Potassium is a metal of group 1 and iodine is a non metal of group 17 hence they can bond together based on their ionic charges.
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Divergent plate boundaries are when plates
collide
move past each other
move apart
Explanation:
Move past each other.
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What is the derived SI unit for quantities of energy?
Answer:
m2·kg·s-2
Explanation:
this is the answ
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
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