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Uma asked a question
Subject: Physics, asked on on 23/4/18
The density of a material in cgs system is 8 g /cm3. In a system of units, in which unit of length is 2 cm and unit of mass is 2 g, what is the density of the material.
Ranjitha R asked a question
Subject: Physics, asked on on 21/3/18
Turpentine oil is flowing thorough a tube of length l and radius r. the pressure difference between the two ends of the tube is P. the viscocity of oil is given by n=P(r2-v2)/4vl,where vis the velocity of oil at a difference x from the axis of the tube. find the dimensions of eeta
Archita Srivastava asked a question
Subject: Physics, asked on on 20/5/16
When white light travels through the glass, the refractive index µ [i.e.the ratio of
speed c: light in vacuum to the speed of light in glass,)is found to vary with the
wavelength µ = A + B/λ2
where A and B are constants. Using the principle of homogeneity determine the
dimensions and SI units of A and B
Abhinav Koul asked a question
Subject: Physics, asked on on 3/5/16
2 resistors of resistances R1= 100+-(plus minus) 3 ohm and R2=200+- 4ohm are connected in parralel.find the equivalent resistance in this parralel combination?
Please explain each and every step with reason as i coudn't understand the steps of this in NCERT
Uma asked a question
Subject: Physics, asked on on 20/10/18
A uniform rod of length 1m having mass 1kg rests against a smooth wall at an angle of 300 with the ground. Calculate the forces exerted by the wall and ground on the rod.
Yatharth asked a question
Subject: Physics, asked on on 26/9/16
10. A drop of olive oil of radius 1mm spreads into a circular film of diameter 40 cm on water surface. Estimate the size of an oil molecule.
Kabir Chhabra asked a question
Subject: Physics, asked on on 2/5/17
If P,Q,R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity (a) (P-Q)/R (b) PQ-R (c) PQ/R (d) (R+Q)/P
Rashmika B asked a question
Subject: Physics, asked on on 20/6/16
The density of mercury is 13.9 g/cm cube in cgs system. Find its value in SI units by dimensional application.
Sree Harine Govindaraj asked a question
Subject: Physics, asked on on 10/5/17
Is it required to learn these definitions of base units? 
Lalita Rani Singh asked a question
Subject: Physics, asked on on 10/6/16
​The value of universal gravitational constant in SI system is G= 6.67*10^-11 Nm^2kg^-2 .What is its value in a new system of units in which unit of distance is 1 km, unit of mass is 10 kg and unit of time is 1 minute?
Sam asked a question
Subject: Physics, asked on on 29/4/17
Main scale of a vernier callipers reads 10mm in 10divisions.10divisions of verniers scale coincide with 9 divisions of main scale.When 2jaws of the callipers touch each other 5thdivision of vernier coincides with 9main scale divisions and zero of the vernier is to right of zero of main scale ,when a cylinder is tightly placed between two jaws,zero of the vernier scale lies slightly to left of 3.2cm and fourth vernier division coincides with a main scale division.Find diameter of cylinder
Jaison asked a question
Subject: Physics, asked on on 26/6/16
i joined yesterday there is long list of topics to cover what should i do
Uma asked a question
Subject: Physics, asked on on 14/9/18
A particle of mass 4m which is at rest explodes in to three fragments. Two of the fragments each of mass m are found to move with speed v in mutually perpendicular directions, what is the total energy released in the process?
Shobikaa asked a question
Subject: Physics, asked on on 12/5/16
Find the permissible error in measuring the surface area of a sphere, if the error in the measurements of its radius is 0.3%.
Uma asked a question
Subject: Physics, asked on on 25/3/19
Two insulated charged copper spheres A and B of identical sizes with charges 2q and 3q respectively repel with a force ‘F ‘when placed at a distance d. A third sphere C of the same size but uncharged is brought in contact with A first and then in contact with B and finally placed in the middle of both. What are the new forces on A, C and B?
Ans - 5/3F, 4/3F and 3F
Please show step by step working
Archita Srivastava asked a question
Subject: Physics, asked on on 20/5/16
The units of force,energy and velocity are 100dyne, 400erg and 10cm/s respectively. Find the units of length, mass and time.
Ayush Sharma asked a question
Subject: Physics, asked on on 24/5/16
Write the dimension of a*b in given equation  E=(b-x2)/at   where E is energy, x is distance and t is time.
Avika . asked a question
Subject: Physics, asked on on 17/7/17
If the distance of Sun from Earth is 1.496 × 10^11 if the angular diameter of sun is 2000 " find the diameter of sun
Uma asked a question
Subject: Physics, asked on on 15/9/18
The potential energy of a spring is 5J when stretched by 10cm. Calculate the additional work done to stretch by 10cm more.
Dhruvin Pandya asked a question
Subject: Physics, asked on on 1/7/19
The reading of the ammeter in the circuit below is
Dhruvin Pandya asked a question
Subject: Physics, asked on on 1/7/19
Reading of an ideal voltmeter in the circuit below is :
Aarav Jagatramka asked a question
Subject: Physics, asked on on 17/7/17
Q-21
Uma asked a question
Subject: Physics, asked on on 20/10/18
In a CO molecule, the distance between C and O atom is 1.2A 0 . Calculate the position of center of mass of the system from the C atom. Assume the mass of Oxygen to be 1.3 times of mass of carbon atom.
Uma asked a question
Subject: Physics, asked on on 10/10/18
A bus of mass 10,000kg is standing on a horizontal rod. The distance between the front and the rear axle is 1.5m. If the distance of the center of mass is 1.0 m behind the front axle, find the force exerted by ground on each front wheel and rear wheel.
Alifa asked a question
Subject: Physics, asked on on 8/9/17
find the value of sin inverse (cos(43pi/5))
Aarav Jagatramka asked a question
Subject: Physics, asked on on 17/7/17
Q-22
Uma asked a question
Subject: Physics, asked on on 4/2/19
Three objects of masses 5 kg, 3 kg and 3 kg are placed at the corners of an equilateral triangle of side 20 cm. Calculate the net gravitational force on the object of 5 kg. (4.3 x 10-8N, making 300 with line joining 5kg with the 3kg’s)
Mansoor asked a question
Subject: Physics, asked on on 27/4/17
What will be the dimensional formula of momentum if force,acceleration&time are taken as fundamental
Uma asked a question
Subject: Physics, asked on on 1/11/18
Water flows through a horizontal pipe of variable cross section. The pressure is 1cm of mercury column when the velocity 35cms-1 . Find the pressure at a point where the velocity is 60cms-1 .
pls answer the question with the same values , don'thyperlink a sum of the same kind.
Thank u sooo much
Uma asked a question
Subject: Physics, asked on on 25/3/19
Plot a graph showing the variation of coulomb force (F) versus 1/r2 , where r is the distance between the two charges of each pair of charges: (3µC, 2µC) and (6µC, –3µC). Interpret the graphs obtained. Ans: Interpretation: magnitude of the slope is proportional to the strength of the force. Sign of the slope indicate the nature of the force. Positive slope indicate repulsive forces (like charges) and negative slope indicate attractive force(unlike charges)
Uma asked a question
Subject: Physics, asked on on 7/9/18
A bag of sand of mass M is resting on a frictionless horizontal surface. If a bullet of mass M/a is fired at it with a velocity v. Calculate the velocity(V) of the bag if the bullet comes to rest inside the bag.
Avika . asked a question
Subject: Physics, asked on on 17/7/17
The radius of earth is 6.37 x 10^6 and its mass is 5.975 x 10^24 kg find the average density to appropriate significant figure
Simran asked a question
Subject: Physics, asked on on 31/7/17
Name the principles on which the working of a) Generator b) Rocket propulsion is based.
Uma asked a question
Subject: Physics, asked on on 21/4/19
Two identical insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is 6.5 × 10-7 C? The radii of A and B are negligible compared to the distance of separation. (b) What is the force of repulsion if each sphere is charged double the above amount, and the distance between them is halved? (c). A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally removed from both. What is the new force of repulsion between A and B?
Siddhant Jain asked a question
Subject: Physics, asked on on 14/5/17
calculate the freezing point and boiling point of water in different parameters
Aarav Jagatramka asked a question
Subject: Physics, asked on on 17/7/17
Q-24
Sourish Vijayamadhavan asked a question
Subject: Physics, asked on on 7/5/17
Dear Sir,

​I attended the unit and measure test- i could get only 66% - need your help to enhance my score..
Want your feedback on the area of improvement.

Regards
​V. Sourish
Parul Awasthi asked a question
Subject: Physics, asked on on 23/5/18
We measure the period of oscillation of a simple pendulam. In successive measurements , the readings turn out to be 2.63s,2.56s, 2.42s,2.71s and 2.80s . Calculate the absolute errors , relative errors and percentage error
Bhavya Arora asked a question
Subject: Physics, asked on on 16/10/17
If a student writes a dimensional formula for torque is [M^xL^1/yT^-2]. Find the value of x,y,z
Aarav Jagatramka asked a question
Subject: Physics, asked on on 17/7/17
Q-17
Jobin Jacob asked a question
Subject: Physics, asked on on 16/6/17
how many dimensions we need to learn?
Sakshi Sudhir Kudalkar asked a question
Subject: Physics, asked on on 29/4/16
how to convert:
  1. 1degree54minutes
  2. 0degree 30minutes
into radians
Alok Singh asked a question
Subject: Physics, asked on on 13/5/17
what is the proper definition of physical quantities?
Parul Awasthi asked a question
Subject: Physics, asked on on 24/5/18
The resistnce R=V/I where V= 100+-5 and I=10+-0.2 .Find the percentage error in R.
Uma asked a question
Subject: Physics, asked on on 14/9/18
A bob of mass m is suspended by a light string of length L. It is imparted a horizontal velocity vo at the lowest point A such that it completes a semi-circular trajectory in the vertical plane with the string becoming slack only on reaching the topmost point, C. . Obtain an expression for (i) vo; (ii) the speeds at points B and C; (iii) the ratio of the kinetic energies (KB/KC) at B and C. Comment on the nature of the trajectory of the bob after it reaches the point C.
Alok Singh asked a question
Subject: Physics, asked on on 14/5/17
Why is not the answer of 60000 + 1234.0 is not equal to 61234 according to the rules of determining significant figures?
Anuj asked a question
Subject: Physics, asked on on 13/5/17
Round off 800531 to 2 significant figures
Harshita asked a question
Subject: Physics, asked on on 23/7/16
when to use dot product and when cross product
Harsh Sharma asked a question
Subject: Physics, asked on on 13/5/16
I want the described answer for estimating the molecular size of oleic acid and oleic acid is a soapyliquid ? these is NCERTtopic which i not get ?plzzzzzzzzzz ansssssssss fast
Alifa asked a question
Subject: Physics, asked on on 8/9/17
if A^2 - A + I = 0, then find the inverse of A
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