# Uncategorized

## Program Design | Design Phase of SDLC & its activities

Program design consists of the steps a programmer should do before they start coding the program in a specific language. These steps when properly documented will make the completed program easier for other programmers to maintain in the future.

There are three broad areas of activity undertaken in the Program Design phase:

•Understanding the Program

•Using Design Tools to Create a Model

•Develop Test Data

## Systems Development Life Cycle – SDLC | Define with example & Explain with Diagram

SDLC definition, explanation with examples. Systems Development Life Cycle – definitions, diagram, step by step discussion

## What is Refractive Index? – definition & formula | Refractive Index sample values

Definition Refractive Index- definition & formula | Refractive Index Table with RI values of common substances like water, glass and air

## Series Circuits, Resistors in series & equivalent resistance – numerical

What is a series circuit? A series circuit consists of several resistors connected in sequence, one after the other. This increases the length of the conductor. Therefore total resistance increases as the number of resistors in series are increased in the circuit. Characteristics of Series Circuit as found from experiments Experiments show that the current […]

## What is the Relation between momentum and kinetic energy? | How to derive the momentum-KE equation?

The relation between momentum(p) and kinetic energy(K) of an object of mass m can be expressed with this equation: p = (2mK)(1/2) That means the square root of 2mK gives us the momentum value. Now let’s derive the equation that gives the relationship between momentum and kinetic energy. Derive an equation to show the relationship […]

## What is the difference between distance and displacement?

Distance is the length actually traveled on a route while Displacement is the shortest distance (straight line distance) between the initial point and final point of the traveled path. Distance is a scalar quantity and required to calculate speed. On the other hand, displacement is a vector quantity that has both magnitude and direction. Displacement […]

## Potential Energy

What Is Potential Energy?Potential energy is a form of stored energy – it is the energy possessed by a body at rest due to its position or size or shape. By doing work, forces act to increase and decrease the kinetic energy of objects within a system. If the kinetic energy that’s removed can be […]

## How does pressure vary with depth in a fluid of constant density? | with the equation of the fluid pressure

Variation of pressure with depth in a fluid of constant density or How does pressure varies with depth in a fluid of constant density? – this is the topic of this post. Variation of pressure with depth in a fluid of constant density – Lab setup Let’s consider a fluid of constant density as shown […]

## Pressure definition & formula and SI unit

Let’s go through the following subtopics: (1) Pressure definition (2) formula of pressure and (3) SI unit of pressure Definition of Pressure Pressure (P) is defined as the normal force F per unit area A over which the force is applied, or P = F/A …………… (1) To define the pressure at a specific point, […]

## Numerical Problems on Impulse and Momentum using graphs – solved

Let’s solve a few selected numerical problems on Impulse and Momentum. If you want to have a quick revision on Impulse and Momentum and get their formulas, then you can do so by going through our posts. The links are given below. Impulse Tutorial | Momentum Tutorial | Impulse momentum theorem Numerical Problems on Impulse […]

## Forces acting on a mass sliding down an inclined plane – using vector resolution

In this post, we will discuss the forces acting on a mass sliding down an inclined plane. To do this we will take the help of the concepts of Vector Resolution. Here we are not considering the presence of friction. Forces acting on a mass sliding down an inclined plane The first step when setting […]

## What are Heat Capacity and Specific Heat? | comparison | Specific Heat Data table | numerical problems solved

we will discuss Heat Capacity and Specific heat, their relationship, comparison, Specific heat data tables, and formula. We will also solve a few numerical problems based on the formulas.

## Work Energy Power – Worksheet problem solution (Q5)

A 10 kg ball is thrown upwards with a speed of 5 m/s. (a) Find its potential energy when it reaches the highest point. (b) Calculate the maximum height it reaches. Solution:Initial KE = (1/2) (10) (5)2 = 125 Joule(a) PE at the highest point = KE at the lowest point at initial moment = […]

## Work Energy Power – Worksheet problem solution (Q4)

A 1 kg ball is thrown up with a speed of 19.9 m/s. Calculate the work done by its weight in one second. The height travelled by the ball in 1 sec =h = ut – (1/2) g t2 = (19.9)(1) – (1/2) (9.8) (1)2 = 15 mHere we have to find out the work […]

## Work Energy Power – Worksheet problem solution (Q3)

A player kicks a ball of mass 250 g placed at the center of the field. The ball leaves his foot with a speed of 8 m/s. Find the work done by the player on the ball. Solution: The ball initially was static. As the player does some work on it by applying force, the […]

## Work Energy Power – Worksheet problem solution (Q2)

A force of 20 N displaces an object through 20 cm and does work of 2 J in the process. Find the angle between the force and the displacement. Solution:W = FD cos θ = (20)(20/100) Cosθ = 4 Cosθ …. (1)Now, 4 Cosθ = 2Cosθ = ½θ = 60 degrees Go back to the […]

## Work Energy Power – Worksheet problem solution (Q1)

A block of mass 1 kg slides down on an inclined plane of inclination 60 degrees. Find the work done by the block’s weight as it slides through 100 cm. Solution:mass = 1kg. Weight = 1x 9.8 N = 9.8 N So the force to be considered is the weight = F=9.8 N in the downward direction. […]

## What is the moment of force and how to measure it? (class 10)

Today’s topic is about Moment of Force – we will discuss it in detail. When a force is applied on a suitable point of a pivoted body and a turning effect of the body is witnessed then we can say that a moment of force is produced. In other words, the turning effect of a […]

## Solution of Physics Numericals for class 9 (set 1 Q16)

Problem Statement A bullet of mass 50 g moving with an initial velocity of 100 m/s, strikes a wooden block and comes to rest after penetrating a distance 2 cm in it. Calculate: (i) Initial momentum of the bullet (ii)final momentum of the bullet (iii) retardation caused by the wooden block, and (iv) resistive force […]

## Solution of Physics Numericals for class 9 (set 1 Q15)

Problem statement A force causes an acceleration of 10 m/s^2 in a body of mass 500 g. What acceleration would be caused by the same force in a body of mass 5 kg. Solution Case 1 mass = m=500 g = 0.5 kg Acceleration = a =10 m/s^2 Force = ma = 0.5 . 10 […]

## Solution of Physics Numericals for class 9 (set 1 Q11)

Problem Statement A force acts for 10 s on a stationary body of mass 100 kg after which the force ceases to act. The body moves through a distance of 100 m in the next 5 s. Calculate (i) the velocity acquired by the body, (ii) the acceleration produced by the force, and (iii) the […]

## Physics Numericals class 9 (CBSE/ICSE)–problem set2

Here we present another set of physics numerical for class 9. You can also get the solutions for this set of physics numerical for class 9. The Links to the solution are given beside the problems. You can try first try and then check the solutions. Or you can also directly refer to the solutions […]

## Velocity time graph – comprehensive Guide

The velocity-time graph is defined as a graphical representation of the velocity of a body in motion with respect to time. Generally, velocity is assigned to the y-axis, and time is pointed on the x-axis. This graph type is also written as a v-t graph or velocity-time graph. The diagram below depicts a few velocity-time […]