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Lesson Posted on 18/06/2017 Tuition/Class VI-VIII Tuition Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science +1 Tuition/Class VI-VIII Tuition/Science less

Numerical problems on force and pressure

Soumi Roy

I am an experienced, qualified tutor with over 5 years of experience in teaching maths and physics across...

Example 1: A force of 1200 N acts on the surface of area 10 cm2 normally. What would be the thrust and pressure on the surface?Given: Force F = 1200 N, Area A = 10 cm2 = 10 ×10-4 m2 = 10-3 m2Thrust = Normal pressure = F = 1200 NPressure P = F/A 1200N10−3m21200N10−3m2 ... read more

Example 1:

A force of 1200 N acts on the surface of area 10 cm2 normally. What would be the thrust and pressure on the surface?

Given:


Force F = 1200 N, Area A = 10 cm2 = 10 ×10-4 m2 = 10-3 m2

Thrust = Normal pressure = F = 1200 N

Pressure P = F/A 1200N103m21200N10−3m2
              
                      = 1.2 ×× 106 N/m2

Example 2:

The elephant weighs 20,000 N stands on one foot of area 1000 cm2. How much pressure would it exert on the ground?

Given:


Force applied by elephant F = 20,000 N, area A = 1000 cm2 = 1000/100×100m2 = 0.1 m2

The pressure is given by

Pressure P = F/A

      = 20,000N/0.1m2


        = 2,00,000 N/m2.

Example 3:

Calculate the pressure produced by a force of 800 N acting on an area of 2.0 m2.

Solution:

Pressure is defined as force per unit area or P = F / A
P = (800 N) / (2.0 m2
)
P = 400 N / m2
= 400 Pa

Example 4:

The pressure of a gas contained in a cylinder with a movable piston is 300 Pa. The area of the piston is 0.5 m2. Calculate the force that is exerted on the piston.

Solution

Pressure is defined as force per unit area or P = F / A
We multiply both sides of the equation by the area to solve for the force as
F = P A
F = (300 Pa) (0.5 m2
)
F = 150 (Pa) m2
= 150 (N / m2
) m2
F = 150 N

Example 5:

A swimming pool of width 9.0 m and length 24.0 m is filled with water to a depth of 3.0 m. Calculate pressure on the bottom of the pool due to the water.

Solution:

The pressure due to a column of fluid is calculated as the product of the height of the fluid times
the density of the fluid times the acceleration due to gravity. For water the density is d = 1000 kg /
m3
.
? P = d h g
? P = (1000 kg / m3
) (3.0 m) (9.8 m / s2
)
? P = 29400 kg m2 / m3
s2
To simplify the units we cancel one m term in the m2
term in the numerator and one m term in
the m3
term in the denominator to get
? P = 29400 kg m / s2
m2

We know that 1N = 1 kg m / s2
so we can write
? P = 29400 N / m2
= 29400 Pa

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Lesson Posted on 16/06/2017 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science Tuition/Class VI-VIII Tuition +1 Tuition/Class VI-VIII Tuition/Science less

Some Basic Questions On Latent Heat

Soumi Roy

I am an experienced, qualified tutor with over 5 years of experience in teaching maths and physics across...

1. Why do we see water droplets on the outer surface of a glass containing ice-cold water?We know that water vapour is present in the air. So when the air is passing through the glass the water vapour molecule comes in contact with the cold surface and losses energy. As when a substance losses energy... read more

1. Why do we see water droplets on the outer surface of a glass containing ice-cold water?

We know that water vapour is present in the air. So when the air is passing through the glass the water vapour molecule comes in contact with the cold surface and losses energy. As when a substance losses energy it goes to its previous state so the water vapour goes to liquid state and we see water droplets on the outer surface on the glass.

2. Why the water kept in an earthen pot remains cold than the water in a normal pot?

The earthen pot has many small pores on its surface and very small amount of water comes out through these pores and gets evaporated. We know for evaporation some heat is needed. So the amount of heat energy is served as latent heat by the water of the pot. By loosing heat the water becomes cool. But normal pots don't have pores and the evaporation cannot happen.

3. Why do we feel cold if some spirit is applied on our skin?

The spirit gets evaporated by absorbing latent heat from our skin. By loosing heat that particular place of skin becomes cold.

4. Why can latent heat not change the temperature of the substance?

Temperature increases due to the increase of kinetic energy of a substance. But if kinetic energy is constant then the temperature will remain same. When a substance forms its liquid by absorbing latent heat there is no change in kinetic energy. So the temperature remains same only the state of matter is changed.

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Lesson Posted on 07/06/2017 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

Class X Science Sa - 2.

Lalit Gautam

If you are facing problem in physics So here are my suggestions for studying physics: Study every day....

Q1. What is the importance of variation? Q2. Differentiate between asexual and sexual mode of reproduction. Q3. Why is DNA copying an essential part of the process of reproduction? Q4. Draw male or female reproductive system in human beings. Q5. What happens when egg is not fertilized? Q6. Explain the... read more

Q1. What is the importance of variation?

Q2. Differentiate between asexual and sexual mode of reproduction.

Q3. Why is DNA copying an essential part of the process of reproduction?

Q4. Draw male or female reproductive system in human beings.

Q5. What happens when egg is not fertilized?

Q6. Explain the bonding in carbon.

Q7. What are allotropes? Differentiate between graphite and diamond.

Q8. What is hydrocarbon? Differentiate between saturated and unsaturated carbon.

Q9. What do you mean by homologous series? Explain homologous series of alkanes.

Q10. Explain Snell’s law of reflection and refraction.

Q11. Draw diagrams of image formation by following in different cases:

(a) Convex mirror

(b) Concave mirror

(c) Convex lens

Q12. Define refractive index. Draw the diagram for refraction of light ray  through the glass slab.

Q13. An object is placed at a distance of 20cm from a convex mirror of focal length 25cm.Calculate the position of the image and discuss its nature.

Q14. An object is placed 24cm from a concave mirror. Its image is inverted and doubles the size of object. Find the focal length of the mirror and the position where the image is formed.

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Answered on 20/06/2017 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

When we chill some salt on a cucumber or etc. Why it becomes some wards cool......?

Anu G.

Chemistry Bonders

Due to osmosis process water will come out to the cucumber
Answers 36 Comments
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Lesson Posted on 03/05/2017 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

Electric Current (short note)

Sudhanshu shekhar

Current always flows in opposite direction of electrons ( electrons thats is -ve charged flows through negative terminal of battery/power supply to positive terminal thus) current flows +ve terminal to -ve terminal. "current is rate of flow of electrons or electric charge" unit- Ampere (remember those... read more

Current always flows in opposite direction of electrons ( electrons thats is -ve charged flows through negative terminal of battery/power supply to positive terminal thus) current flows +ve terminal to -ve terminal.

"current is rate of flow of electrons or electric charge"

unit- Ampere (remember those unit which are related to any scientist name their first letter should be written in capital)

I= Q/t  (I = current (Ampere),   Q = charge (Coloumb),    t= time (second) )

Facts- 

1. Current always flows to a complete circuit i.e. if the circuit breaks or incomplete the current will not flow

2. mechanism of current flow - when we put power supply i.e. battery or AC voltage first the electrons flows when the electron complete the cycle i.e. when it reached -ve terminal to +ve terminat only then the current begin to flow. (and that is the reason why current not flows in incomplete circuit because electron is not reached to +ve terminal)

3. When we increase the voltage the current may increase but we can't increase the voltage by increasing the current (that related to OHM's law see on next article).

 4. we can apply resistors to change the amount of electricity flow in circuit. To understand we can state resistor are barrier which resist/block the current by some amount.

5. Current flows always on those material which have have free electrons (to move) i.e conductors and generally metal are good conductor.

free electrons are those electron which are independent to move in a material genenarlly in metals the electrons in outer most orbit freed to complete the octat so this is clear and the reason why current flows in metal only because metal have more free eelctrons/ charge carrier rather than non metal (so there will no current flow in non mental due to it has no free electron to propogate and if there is no charge....so no flow of charge so no current).

 

CONDUCTOR- Conductor are those material who can conduct the electric/ current, heat etc. 

NON CONDUCTOR- Those material who can not counduct the electric, heat etc.

METAL- Those element which have free electron or can produce free electrons.

CONDUCTIVITY- It is property of material which define capibility/quality of current flow. If it state the conductiity of any material is high it means there should low resistance in material and maximum current flow.

Any related queries ping me on sudhanshshakhar@gmail.com

pls remark subject- doubt queries

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Answered on 17/03/2017 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

What are best books for science and maths to refer for std 10th state board?

Aparna B.

Tutor

Maths: Everyone suggests RD Sharma, but personally, I found RS Aggrawal more helpful. (Maybe because I never had the courage to solve RD because of its size.) Be sure to go through all the questions of NCERT at least twice. It's lame to solve the same questions again and again, but it definitely helps... read more
Maths: Everyone suggests RD Sharma, but personally, I found RS Aggrawal more helpful. (Maybe because I never had the courage to solve RD because of its size.) Be sure to go through all the questions of NCERT at least twice. It's lame to solve the same questions again and again, but it definitely helps to score better. (It did to me, of course.) Science: Lakhmir singh and Manjit Kaur is honestly the best one(and it has better graphics too). Pick up topics from NCERT, and then go through these reference books for details. But almost all of the content in these books is helpful, very helpful. And NCERT, learn as much as you can from it. If you're done with all of the studies and the revision, opt for Oswaal Sample Papers. They do help you to practice better. read less
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Answered on 30 Jan Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

what is dynamic motion ?

Sujoy D.

Tutor

Dynamics is a branch of applied mathematics (specifically classical mechanics) concerned with the study of forces and torques and their effect on motion, as opposed to kinematics, which studies the motion of objects without reference to its causes. Isaac Newton defined the fundamental physical laws which... read more

Dynamics is a branch of applied mathematics (specifically classical mechanics) concerned with the study of forces and torques and their effect on motion, as opposed to kinematics, which studies the motion of objects without reference to its causes. Isaac Newton defined the fundamental physical laws which govern dynamics in physics, especially his second law of motion.Force causes an object's state of motion to change. DYNAMICS are two types: 1.Linear 2.Rotational

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Answered on 30 Jan Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

Suggest some good reference books for CBSE Class IX Mathematics and General Science (Physics, Chemistry & Biology).

Sujoy D.

Tutor

Mathematics by R.S. Agrawal' Physics, Chemistry and Biology by S. Chand publications will be good.
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Answered on 25/05/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

Name the device that superimposes audio frequency signals on radio frequency signal in a radio transmitter?

Wilfred Thomas

Physics Wiz

Modulator
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Answered on 13/06/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Science

Why do we need to calculate the value of packing effeciency for FCC and CCP only on triangle consideration....

Arjun

Just learn how to use your computer... ??... Basic programming language would do..
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