Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Sm .. 4 years, 1 month ago
- 4 answers
Posted by Kamya Secrets 4 years, 1 month ago
- 0 answers
Posted by Pk ⚔️ 4 years, 1 month ago
- 3 answers
P Singh . 4 years, 1 month ago
Posted by ⠀ 4 years, 1 month ago
- 1 answers
Posted by Nikita Kashinwar 4 years, 1 month ago
- 1 answers
Yogita Ingle 4 years, 1 month ago
1 watt hour is the unit of energy which is equivalent to 1 watt (W) of power used continuously for 1 hour of time.
It is not the SI unit of energy.
The SI unit of energy is Joule (J).
To convert energy from W h to J, we change the units as:
Energy = 1 watt hour
⇒ E = 1 × J/s × 60 × 60 × s
⇒ E = 3600 J
- So the equivalent of 1 watt hour in SI unit is 3600 J.
Posted by Sakshi Bangarwa 4 years, 1 month ago
- 1 answers
Posted by Aditi Rathore 4 years, 1 month ago
- 1 answers
Posted by Jeevan B. K 4 years, 1 month ago
- 0 answers
Posted by Kashna Siddique 4 years, 1 month ago
- 1 answers
Gaurav Seth 4 years, 1 month ago
Let the 2 vectors be A and B and their resultant be R.
To prove :- A=B=R.
.
For an easier way, Let us use this relation to find out theta when A=B=R.
.
R^2 = A^2 + B^2 + 2ABCostheta
.
Here A^2 = B^2 = R^2 ,
Hence, R^2 = R^2 + R^2 + 2R^2 (Costheta)
.
R^2 = 2R^2 + 2R^2 (Costheta)
Cos theta = (R^2 - 2R^2) / 2R^2 = (-R^2) / 2R^2
Cos theta = -1/2
Hence theta = 120 degrees.
.
Posted by Jeevan B. K 4 years, 1 month ago
- 0 answers
Posted by Abhishek Solanki 4 years, 1 month ago
- 1 answers
Gaurav Seth 4 years, 1 month ago
For A to be perpendicular to B, A.B should be zero
A.B=(2i + 3j- 6k).(3i-xj+6k)=0
6-3M-36=0
-30-3M=0
3M=-30
or M=-10
Posted by Annapoorna Madhu 4 years, 1 month ago
- 1 answers
Gaurav Seth 4 years, 1 month ago
To reach the peak of 10m the energy of spring must be
Mass = 50g = 50/1000kg = 0.05kg
acceleration due to gravity = g m/s^2 (take it as 10m/s^2 or 9.8 m/s^2 as directed in question)
Height = 10m
P = mgh
= 0.05 X g X 10 J
= 0.5g J
a) The potential energy of spring to throw it to height 10m is = 0.5g J
Taking g = 10; its 5j
b) To throw obhect to any height 'H' :
Let force coefficent of spring be = k
k X 0.03 = 5
k = 500/3
To throw it to any height H; compression c should be :
k( c) = mgH
500/3 X c = 0.05 X 10 X H
c = 0.05 X 10 X H X 3/500
Substitute the value of any H, to find out c (how much it needs to be compresssed. c is in metres.
Posted by Shiv Kachhela 4 years, 1 month ago
- 2 answers
Hariom Pandey 4 years, 1 month ago
Gaurav Seth 4 years, 1 month ago
Those physical quantities which require magnitude as well as direction for their complete representation and follows vector laws are called vectors.
Vector can be divided into two types
1. Polar Vectors
These are those vectors which have a starting point or a point of application as a displacement, force etc.
2. Axial Vectors
These are those vectors which represent rotational effect and act along the axis of rotation in accordance with right hand screw rule as angular velocity, torque, angular momentum etc.
Posted by Seraj Ali ?? 4 years, 1 month ago
- 5 answers
Aadya Singh 4 years, 1 month ago
Posted by Seraj Ali ?? 4 years, 1 month ago
- 1 answers
Posted by Harsha C.D 4 years, 1 month ago
- 1 answers
Yogita Ingle 4 years, 1 month ago
In 1920, Indian physicist Satyendra Nath Bose made a study regarding the fifth state of matter. Based on his study, Albert Einstein predicted a fifth state of matter called as the Bose-Einstein Condensate.
The Bose-Einstein condensation or BEC is formed by cooling a gas of extremely low density, about one hundred thousandth of the density of normal air, to super low temperatures.
Posted by Harsha C.D 4 years, 1 month ago
- 1 answers
Yogita Ingle 4 years, 1 month ago
The de Broglie equation is one of the equations that is commonly used to define the wave properties of matter. It basically describes the wave nature of the electron.
Electromagnetic radiation, exhibit dual nature of a particle (having a momentum) and wave (expressed in frequency, wavelength). Microscopic particle-like electrons also proved to possess this dual nature property.
Louis de Broglie in his thesis suggested that any moving particle, whether microscopic or macroscopic will be associated with a wave character. It was called ‘Matter Waves’. He further proposed a relation between the velocity and momentum of a particle with the wavelength if the particle had to behave as a wave.
Posted by Harsha C.D 4 years, 1 month ago
- 1 answers
Meghna Thapar 4 years, 1 month ago
In mathematics, the Riemann hypothesis is a conjecture that the Riemann zeta function has its zeros only at the negative even integers and complex numbers with real part. Many consider it to be the most important unsolved problem in pure mathematics. Riemann hypothesis, in number theory, hypothesis by German mathematician Bernhard Riemann concerning the location of solutions to the Riemann zeta function, which is connected to the prime number theorem and has important implications for the distribution of prime numbers.
Posted by Harsha C.D 4 years, 1 month ago
- 0 answers
Posted by Harsha C.D 4 years, 1 month ago
- 3 answers
Yogita Ingle 4 years, 1 month ago
States of matter
- Solid: The particles, or the atoms, ions and molecules, are packed together closely. The particles are free to vibrate but are not free to move. They can only change their volume and shape when external force is applied, or when they are cut into smaller pieces,
- Liquid: They are incompressible matter in liquid form that is not dependent on pressure. They have a fixed volume, if the pressure and temperature are kept unchanged. When solid is exposed to temperatures higher than their specific melting points, they have a tendency to transform into the liquid state, subject to pressure properties.
- Gas: the particles in a gaseous state have enough kinetic energy in it so as to render the molecular forces to zero. The distance between the molecules is larger than their size itself. A liquid can be transformed to a gaseous state by heating it to the boiling point, keeping the pressure constant, or by decreasing the pressure, while keeping the boiling point constant.
- Plasma: Plasma does not have a specific shape or volume and are electrically conducive. They produce magnetic fields and currents. A gas can be transformed into plasma by two methods: difference of high voltage between 2 points, or by giving exposure to high temperature. The plasma state does not really exist in abundance on earth and hence is usually misunderstood. Examples of activities that lead to generation of plasma are neon lights, lightening, plasma TVs etc.
- Bose Einstein Condensate: it is a superfluid in gaseous state formed by atoms that are cooled to temperatures extremely close to zero.
Posted by Rupinder Kaur 4 years, 1 month ago
- 3 answers
Posted by Rupinder Kaur 4 years, 1 month ago
- 3 answers
Akanshi Shrivastav 4 years, 1 month ago
Tec Om 4 years, 1 month ago
Akhifa Sheik 4 years, 1 month ago
Posted by Aditi Singhal 4 years, 1 month ago
- 1 answers
Jiten .. 4 years, 1 month ago
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
P Singh . 4 years, 1 month ago
2Thank You