Home » Posts tagged 'Ohm’s law'
Tag Archives: Ohm’s law
Angle between acceleration and velocity in projectile motion
What is the angle between the directions of acceleration and velocity at the highest point of projectile?
Answer:
At the highest point of a projectile, the vertical component of velocity is zero and the velocity is entirely horizontal. The direction of acceleration (due to gravity) is vertically downwards throughout the motion of the projectile.
Therefore, the angle between the direction of acceleration and velocity at the highest point of a projectile is 90 °
Related articles
Share the knowledge
Motion of connected system – A numerical problem
What is the acceleration of the body m2 in the diagram below?
(The question was posted by Shuvam Shukla. Students and other visitors can post solution as comments to this post)
Related articles
- Numerical problem from uniformly accelerated motion (askphysics.com)
- Download CBSE Physics Question Paper 2012 (plustwophysics.com)
- What you do today could affect what happened yesterday!! (plustwophysics.com)
- What is Higgs Boson? (plustwophysics.com)
- Numerical Problems from Kinematics (askphysics.com)
- Numerical from Laws of Motion (askphysics.com)
Share the knowledge
V proportional to I or I proportional to V in Ohm’s Law?
Why we used I proportional to V?
Can we write V proportional to I also?
Answer:
Both are ok. If we are changing the current and observing the voltage, then it is V∝ I
If we are changing the voltage and observing the current, then
I∝ V
In general, we write
the dependent variable proportional to the independent variable
dependent variable = the quantity measured by us
independent variable = the quantity fixed by us
Share the knowledge
Change in resistance of a wire on stretching
A WIRE OF LENGTH L AND AREA OF CROSS SECTION A HAS A RESISTANCE R. IF THE WIRE IS STRACHED TO TWICE OF ITS LENGTH WHILE A REMAINS SAME , WHAT IS THE NEW RESISTANCE????
Answer:
We know that R = ρl/A
When the wire is stretched, there is no change in volume. So if length is doubled then volume will be halved so that volume is constant.
Therefore, the new resistance R’ = 4R
That is the resistance becomes four times its original value.
1. A WIRE OF LENGTH L AND AREA OF CROSS SECTION A HAS A RESISTANCE R. IF THE WIRE IS STRACHED TO TWICE OF ITS LENGTH WHILE A REMAINS SAME , WHAT IS THE NEW RESISTANCE????
Share the knowledge
AskPhysics Q&A
- what is a laser?
- How Quantum Field Theory explains triboelectricity?
- Important topics to study for NEET Physics
- What are the most important topics in JAM Physics?
- If the size of the unit decreases by 20% the% change in the numerical value is
- Why is easier to hammer a sharp nail into wood than a blunt one?
- Can we dissociate aluminium using infrared multi photon dissociation method?
- Vector A + Vector B = vector C and A +2B is perpendicular to A then find relation between vector B and C.
- Why a ray when moves to normal from rarer to denser medium
- What is the major term involved in refraction
askphysics@Twitter
Ask Physics
@askphysics
- Have a doubt in Physics? https://t.co/M8wFr9xQEZ
about 3 weeks ago