10. Numerical problems:

b. A stone is thrown vertically upwards with an initial velocity of 20 m/sec.find the maximum height it reaches and the time taken by it to reach the height. (g = 10 m/s2).

c. A car is moving at a rate of 72 km/hr. How far does the car move when it stops after 4 seconds?

d. A bus starts from rest. If the acceleration is 2 m/s2, find
1. the distance travelled.
2. the velocity after 2 seconds.

e. A stone is thrown vertically upward with the velocity of 25 m/s. How longo it take to reach the maximum height? Also calculate the height.


with process please ​

Answers

Answer 1

Answer:

a)20 m,2s

Explanation:

Given

Initial velocity=20 m /sec

g=10 m/s square

v =0m/s

h =?

t =?

now,

v = U +gt

=v=20 +10t

Or,10t=20

Or,t=20

10

therfore ,2 s.

Again,

h=ut -1 gt square

2

Or, h=20×2-1×10(2)square (multiply and cut )2×5 =10

; 2

Or,40-5×4

therefore , 20m

Answer 2
For question e,

u = 25 ms-1
v = 0 m/s
a = -10m/s^2

We have to find time and distance,

For time,

v = u + at

Which can be rephrased as,

v - u/a = t

t = 0 - 25 / -10

t = 2.5 secs

Hence, the stone takes 2.5 secs to reach the maximum height.

To calculate the maximum height attained by the stone, we have to calculate distance/ displacement .

The formula for calculating distance is,

s = ut + 1/2at^2

s = 25 * 2.5 + 1/2 * -10 * 2.5 * 2.5

s = 62.5 + (- 31.25)

s = 62.5 - 31.25

s = 31.25mts

Hence, the maximum distance travelled by the stone is 31.25 meters.

Hope this helps you. Plz let me know if you have any doubts.

Related Questions

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.

Answers

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

hope you have understood this....

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3. Write any two differences between contact force and not contact force with examples.​

Answers

Explanation:

Contact force includes applied force, the normal force, the tension and the frictional force. Non-contact force includes electro-magnetic force, the gravitational force and the electrostatic force. For Example, applied force is required to kick the ball else the ball would not move.

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the forces which hold molecules in a water drop are called choose surface tension adhesive or cohesive forces yessfgb​

Answers

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!

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Class 9 SCIENCE
ch 2 Is matter around us pure
Question -
what you mean by crystallization? Give example.​

Answers

Answer:

Crystallization is defined as a process by which a chemical is converted from a liquid solution into a solid crystalline state.

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.

Answers

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 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

Answers

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.

https://brainly.com/question/1515003

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

HOPE THIS HELPS

After 14.1s, a jogger's displacement is 520m. What is the average velocity in km/h

Answers

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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hi pls answer 11 point pls

Answers

Answer:

the answer is a. a ball is moving towards the camera faster then slower

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​

Answers

Answer:

1 casparian strips are present in the root of endodermis.

2 the endarch condition is the character fature of stem.

help me please i dont understand

Answers

Answer:

inertia is due to friction

Which characteristic accounts for the fact that red lights in dark rooms and DO NOT expose negatives during developing?

Answers

Answer:

the long wavelength and not focused on the negatives.

Is ambition a good or bad thing?

Answers

Answer:

some amount of ambition is good for your motivation but excess ambition is dangerous.

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 ​

Answers

Car moving on the road

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?

Answers

Answer:a) Distance= 240m. b) Displacement= 90m. c) Average Speed= 5[tex]ms^{-1}[/tex]. d) Average Velocity= 1.875 [tex]ms^{-1}[/tex]

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]

13 The pressure of the atmosphere is 100 000 Pa
a Calculate the force with which the atmosphere presses on the outside of a large window 2.0m
high and 1.25m wide.
bExplain why this force does not break the window.

Answers

Question:-

(A) The pressure of the atmosphere is 100000 Pa Calculate the force with which the atmosphere presses on the outside of a large window 2.0m high and 1.25m wide.

(B) Explain why this force does not break the window.

Answer:-

(A)

As we know

[tex]Formula -> pressure = {force} \times area[/tex]

Given->

Pressure-> 1atm

height-> 2 m

wide -> 1.25 m

Putting value in formula ->

[tex]100000 = force \times(h \times w) \\ 100000= force \times 2 \times 1.25 \\ force = \frac{100000}{2 \times 1.25}\\ force = {4×10000}\\ force = 40000\: newton \: (N)[/tex]

(B) Because atmosphere is present on both sides of the window pane so same force is applied from both sides of the window and as we know force is a vector quantity so according to the vector sum the force got cancelled out and net force becomes zero .

That's why even in presence of this amount of force window glass donot break

a) The force with which the atmosphere presses on the outside of the window  be 3 × 10⁵ Newton.

b) As the atmosphere exerts thus much force on either side of the window, the opposing forces cancel one another out. The window is not broken by this force, therefore.

What is pressure?

It is the ratio between the force being applied and the surface area being applied to. Pressure can be described as: the force applied perpendicularly to an object's surface divided by the surface area over which it is applied.

Given parameters:

The pressure of the atmosphere is 100000 Pa

Height of the large window: h = 2.0 m.

Width of the  large window: d = 1.5 m.

surface area of the window = h×d = 2×1.5 m² = 3.0 m².

Hence,  the force with which the atmosphere presses on the outside of the window = pressure × surface area

= 100000 Pa ×  3.0 m².

= 3 × 10⁵ Newton.

b) As the atmosphere applies this amount of force in both side of the window, each two each an opposite force nullifies each other. So, this force does not break the window.

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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

Answers

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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define physical quantity​

Answers

Answer:

The quantity which can be measured is called physical quantity.

Answer:

Those quantities which can be measured are called physical quantities.

who is the most genius scientist in the world​

Answers

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.

Answers

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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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

Answers

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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How many marbles would fit in beta Centauri?

Answers

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:

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

Answers

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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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)?​

Answers

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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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.

Answers

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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A car moves with an average speed of 45 mph. How long does a car take to travel 90 miles?

Answers

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

True or false? Balanced forces cause a change in motion. T/F
How do you know this?
Help me, it's due soon!

Answers

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.

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?​

Answers

The car will be moving at 29 due to the district of acceleration

plzz can anyone solve this

plzzzz guys tomorrow is my exam ..
plzz​

Answers

Answer:

i hope it helped U

stay safe stay happy

Help with the question I know this question is simple but i am weak in physics

Answers

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

34.1 grams / 1.1 mL =

Answers

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.

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