Speed is essentially the physical quantity that tells us how fast or slow an object moves. The speed of an object is defined as “the rate of change of its distance with respect to time”.Mathematically, it is given as:$Speed(s)=\frac{Distance(d)}{Time(t)}$The SI unit of speed is given by m/s. But, there may be ... Read More

We can measure time using Sundials, Water Clocks, Mechanical Clocks, Quartz Clocks, and Atomic Clocks. In ancient days sundials are used to measure time but later other clocks have come into existence.

Solution :In the given triangle ABC, $\angle B=90°$, $C = \theta$.We know that the sum of all the angles in a triangle is 180°.$\angle A+ \angle B + \angle C=180°$$\angle A+ 90°+ \theta = 180°$$\angle A = 180° - (90°+ \theta)$$\angle A = 180° - 90°- \theta$$\angle A = 90°- ... Read More

Parachutes are made from light and strong fabric, like silk and nylon. Parachutes are dome-shaped with rectangles used to carry a variety of loads, such as people, food, equipment, space capsules, and bombs.

Tally marks are a way to represent data. In this method, it is usual to express numbers with the help of vertical lines. The numbers are usually represented as groups of 5. Tally marks representation of some numbers is shown below:

Woolen clothes are the best to wear in winter. The structure of the wool fiber is that wool fiber traps a large amount of air inside it. Since air is a bad conductor of heat it won't let body heat flow out, bringing warmth and solace to the body. Therefore ... Read More

A Thermos flask is commonly known as Vacuum Flask which is an insulating storage vessel that greatly increases the time over which its contents remain hotter or cooler than the flask's surroundings.It does not allow heat transfer by any of the three means that heat can travel.The silver coating on ... Read More

The to and fro motion of a body about a fixed point is called oscillatory or periodic motion. In this motion, the body repeats itself on the same path. If there is no friction the body continues its movement forever. There are two types of oscillations: linear oscillation and circular ... Read More

It is the energy contained in fuel or material. It is determined by the amount of energy produced by the complete combustion of the fuel or the material. The SI unit of calorific value is Joule/Kg or Kilo Joule/Kg. The calorific values of some fuels areLPG - 46.1 MJ/kgfuel ... Read More

Hello Mansirat, Motion is the phenomenon in which an object changes its position or orientation from with respect to a frame of reference over time.  It can be described in terms of distance, displacement, acceleration, velocity, speed and time.For example:- pushing a block, opening a door, rotating stone with attached ... Read More