   ### Siva P Male, 23 Years

Associated for 1 Year 8 Months
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Class 11 - 12 Tutor

#### Activity Score - 345

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Location: Bangalore, India
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• B.Tech/B.E. (NIT calicut - 2017)
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An experienced tutor who can teach physics and mathematics as well as advanced mechanical subjects in the best way possible with real life examples. Medium of teaching : English

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Home Tuition Only
Tutoring Approach :

I wouldn't go for an hourly approach whille teaching rather I would teach until the student understands the concept and I can give suggestions on how to approach for competitive exams.

Teaches:
 Class 9 - 10 Mathematics Physics Algebra All Boards INR 150 / Hour Class 11 - 12 Mathematics Physics CBSE Board INR 160 / Hour Engineering Entrance & IITJEE Physics IIT JEE Mains AIEEE INR 170 / Hour Engineering Subjects Mechanical INR 180 / Hour Class 6 - 8 Mathematics Physics All Boards INR 150 / Hour Basic Computer / Office MS Office INR 150 / Hour

### 2 Notes written by me

• #### Etiquette In Technology

Files: 1

How to text someone? How to talk on the phone? How to write an email?

• #### Wind Based Water Pump

Files: 1

Water Pump Using Renewable Energy Like Wind!

• ## Question: An arbitrary vector v can be expressed as

Posted in: Physics | Date: 09/01/2018

It is option D

Any vector can be expressed as a sum of 3 perpendicular unit vectors, each multiplied by some number(the component of vector along that axis)

In the picture attached, the vector a has 3 different components along 3 perpendicular axes x,y,z and these components need not be equal all the times

• ## Question: Which of the following statements false?

Posted in: Physics | Date: 09/01/2018

Only false statement is : Option (C)

In the image attached it is clear that distance(total path length) is greater than displacement. Rest of the options are true.

• ## Question: Which is a constant for a freely falling object?

Posted in: Physics | Date: 09/01/2018

For a freely falling body, there no other forces acting on the body other than gravity. (If you assume that there is no air resistance). The gravity force is nothing but the weight of the body which is constant. Since Force = mass * acceleration and mass is constant, so acceleration due to gravity is constant which is 9.81 m/s^2

Displacement, Velocity and speed increases as it falls but acceleration due to gravity is constant for earth

• ## Question: Vectors can be added by

Posted in: Physics | Date: 09/01/2018

Option C

Vector addition is the right way to add any number of vectors

In vector addition, we add the magnitudes of each unit vector separately

The same applies for the subtraction also which is shown in figure

• ## Question: A rain drop of mass 2.00 g falls from a height 1.00 km. It hits the ground with ...

Posted in: Physics | Date: 09/01/2018

Assumptions : No effect of air, gravity change due to height

Force = mg = 0.002*10 = 0.02 N     (since 2 g = 0.002 kg)

Displacement = height = 1km = 1000 m

Work done = Force * displacement

Work done = 0.02*1000 = 20 N.m

Note : in the question the velocity which is mentioned is 50 m/s but since it is given in the question that g value is 10m/s^2 which is constant , the velocity should be = sqrt(2gh) = sqrt(2*10*1000) = 141.4 m/s

• ## Question: Which of the following physical quantities a scalar?

Posted in: Physics | Date: 09/01/2018

Option B

Linear momentum = mass*velocity and all the velocities are vector quantities,

so linear momentum is also a vector (since mass is scalar)

But for current flowing in a wire we mention just a number (like 2 Amperes) but not the direction

• ## Question: A rain drop of mass 2.00 g falls from a height 1.00 km. It hits the ground with ...

Posted in: Physics | Date: 09/01/2018

Assumptions : No effect of air, gravity change due to height

Force = mg = 0.002*10 = 0.02 N     (since 2 g = 0.002 kg)

Displacement = height = 1km = 1000 m

Work done = Force * displacement

Work done = 0.02*1000 = 20 N.m

• ## Question: The bob of a pendulum is released from a horizontal position. If the length of t...

Posted in: Physics | Date: 09/01/2018

Potential energy of bob is converted to kinetic energy and the energy lost during transition is 5%

Total energy intially =  mgh

Total energy final = 0.5*mv^2

Energy lost = 5% of mgh = 0.05*mgh

So intial energy = final energy + loss

• mgh = 0.5*mv^2 + 0.05*mgh
• 0.95*mgh = 0.5*mv^2
• 0.475*gh = v^2 (since g=10, h=1.5)
• v = sqrt (0.475*10*1.5) = 2.67 m/s

• ## Question: A pump on the ground floor of a building can pump up water to fill a tank of vol...

Posted in: Physics | Date: 09/01/2018

Given flow rate = 30 m^3 in 15 min = 2 m^3/min = 1/30 m^3/s

mass flow rate = vol. flow rate*density = 1/30 * 1000 = 100/3 kg/s

Power required = (mass flow rate)*g*h = 100/3*10*40 = 40000/3 Watts = 40/3 kW

But since efficiency is 30% - (if 100 W is consumed only 30 W will be supplied)

Total power consumed = power required/efficiency = (40/3)/0.3 = 44.44 kW

• ## Question: Two billiard balls each with a mass of 150g collide head-on in an elastic collis...

Posted in: Physics | Date: 09/01/2018

The formulas for velocities after collision is mentioned in the picture

Thumbrule : If 2 equal masses collide with each other with v1, v2 velocities then their final velocities will be exchanged

• ## Question: In a two dimensional motion, instantaneous speed v is a positive constant. Then ...

Posted in: Physics | Date: 09/01/2018

Option D

Speed = distance/time

since the question has instantaneous speed as constant, it means distance covered(path) in a time is constant / equal

rest of the options are related to velocity but not speed

• ## Question: When air is pumped into a cycle tyre the volume and pressure of the air in the t...

Posted in: Physics | Date: 10/01/2018

Boyle's law holds true for a system if there is no addition of energy i.e PV=constant

In this case we are doing some work to pump air into the tyre so the energy is added into the system and thus the temperature will also increase inside the tyre and boyle's law is applied for constant temperature only

• ## Question: A hot air balloon is a sphere of radius 8 m. The air inside is at a temperature ...

Posted in: Physics | Date: 10/01/2018

So membrane tension is 5 N/m which is given to find the pressure inside the sphere. The figure shows the forces along the membrane and pressure inside sphere

So the force by membrane = 2*pi*R*sigma = 2*pi*8*5 = 80*pi N

Force by the pressure inside = Area*Pressure = pi*R*R*P

• => pi*8*8*P = 80*pi
• => P = 5/4 N/m^2  which is gauge pressure but not absolute pressure
• => Pabs = 5/4 + 1.013*10^5 Pa which is absolute pressure

Now use the formula PM = dRT

Now use the Pabs found and substitute to find density d          (T is in kelvins)

M for air = 28.97 g/mol

Similarly, find the density of air outside balloon and find the buoyancy force acting on balloon and subtract buoyancy with weight of ballon then you will the weight it can carry

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