Students and Teachers Forum

 The force of gravity keeps all of the planets in orbit around the sun. Gravity is the force by which a planet or other body draws objects toward its center.  Why do things fall down when you throw them or drop them? The answer is .....

Solution : 2years = 2 * 365 days = 730 days = 730 * 24 hours = 17520 .....

Solution : 645.7 = 6.457 x .....

Solution : acceleration a = 100 m/s2 mass m = 10 metric ton = 10 x 1000 Kg = 10000 Kg Force F = ? We know, F = m x a =  100 x 10000 = 1000000 N Thus, the magnitude of force is 1000000 .....

Solution, 1000 mg = 1 gm or, 1 mg = 1/1000 gm or, 75 mg = 75/1000 gm = 0.075 .....

Solution : 1 Km = 1000 m or, 4 Km = 4 * 1000 m = 4000 .....

Solution : 1 km = 1000 m and, 1 m = 100 cm so, 1 km = 100000 cm and, 40 Km = 40 *100000 = 4000000 .....

In general, 1 month is the time duration of 30 .....

Pine plants grows in warm and cold climate. The camel is an animal of  hot .....

Some aquatic plants are pistia, water hyacinth, lemna, hydrilla, chara, .....

Some plants found in derserts are  cactus, opuntia, aloe, acacia, zizyphus, .....

Perennial plants are those plants which are expected to live more than two years.

Perennials may go to seed every year and may even die back to the ground at times, but their root systems are very much alive and the plants will continue growing .....

.....

Nocturnal animals are awake and active at night and then sleep during the day. Some nocturnal animals can be seen during the day, but most of them spend their whole day resting. Examples of nocturnal animals include bats, skunks, aardvarks, .....

Plants that are found inside water are chara, hydrilla, vallisneria, utricularia, ceratophyllum, .....

.....

Plants and animals are living things. They can grow and produce young ones. They need food and oxygen to live. They can move and show response. They have a life period. After that, they .....

There are many characteristics of living things. Some of them are: 1. Movement All living things move in some way. You may have seen animals walking and the plant moving their parts (like leaf, flower) to the direction of .....

Second is the SI unit of .....

Meter is called a standard unit because it is a SI unit, which is accepted all over the .....

A meniscus is a curve in the surface of a molecular substance when it touches another material. With water, you can think of it as when water sticks to the inside of a glass. A meniscus can go up or down. It all depends on if the molecules of the .....

Gun recoil back when a bullet is fired from it due to the principle of conservation of linear momentum. The backward recoil gun momentum balances the forward bullet momentum to maintain zero total momentum. As the mass of the bullet is small its .....

From the definition of acceleration, Acceleration(a) = Final velocity(v) - Initial velocity(u)                                        .....

Solution : 2 hour and 5 second = 2 *60 minute + 5 second = 2*60*60 seconds + 5 seconds = 7200 seconds + 5 seconds = 7205 .....

In mathematics, factorization or factoring is the decomposition of an object into a product of other objects, or factors, which when multiplied together give the original. For example, the number 15 factors into primes as 3 × .....

.....

Fusion is the process or result of joining two or more things together to form a single .....

Have you ever seen water boiling? Look at the figure above. What you see? You can see vapours in large amount. How it is possible? Simply when the water is heated. Thus, evaporation is the process, in which substance in a liquid state .....

Mixture is an impure substance formed by the physical combination of two or more substances in any proportion by their weights. For examples : Sand and water, salt and water, milk, blood, sea water, .....

Compound is a substance made up of two or more atoms of differnet elements in a fixed proportion by weights. For example. Water, Carbondioxide, Sodium Chloride, Hydrochloric acid, Calcium oxide, .....

An element is a pure substance which is made of only one kind of atoms. For example : iron, coper, zinc, silver, gold, oxygen, .....

Some of the properties of matter are : Matter has mass Matter has weight Matter occupy space Matter exists in solid, liquid or gas .....

.....

Anything which has mass and volume is called matter. Matter can exist in three physical states : solid, liquid and .....

An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. The biological processes that occur within all living .....

Carbonic anhydrases are enzymes that catalyze the hydration of carbon dioxide and the dehydration of bicarbonate:

CO2 + H2O <-----> HCO3- + .....

If a body can cover equal distances in equal intervals of time then the body is said to move with uniform motion. For examples: motion of the earth around the sun, a car moving on a straight road without any change in its velocity, motion of .....

There are many examples for a body is at rest and in motion at the same time.

When we are sitting in the car, we are in rest for those persons who also travelling with us. But, we’re in motion for an outsider. A passenger in the .....

Average velocity is the displacement of a body divided by time which takes to cover that distance. While relative velocity is the velocity of one body with respect to other body. Average velocity depends upon the distance covered by single .....

.....

SI units of all physical quantities were adopted from the year .....

If the current changes direction after equal intervals of time, it is called alternating current AC. A generator or dynamo produces alternating .....

Multiples / submultiples of time

1 day - 24 hours (h)

1 hour (h) - 60 minute (min)

1 minute (min) - 60 second (s)

1 second (s) - 1000 millisecond .....

The unit of mass is measured in Pound in FPS .....

In FPS system, unit of mass is .....

In FPS system of measurement, mass is measured in .....

Enterprise means to plan a business, to start it and run it.

It means to bring the factors of production together, assign each its proper task, and pay them remuneration when the work is done. It implies not only running of a business, .....

Solution : Profit Percent = ( Profit amount / Cost Price ) x 100% where, Profit amount = Selling Price - Cost .....

Solution : m = ax n = ay and, a2 = (mynx)z Now,  a2 = (mynx)z a2 = [(ax)y (ay)x]z a2 = [axyaxy]z a2 = (a2xy)z a2 = a2xyz equating the powers of same base, we get, 2 = 2xyz so, xyz = .....

Those quantities which cannot be measured are called non-physical quantities. For examples : love, anger, affection, kindness, .....