Students and Teachers Forum
Velocity ratio (VR) is defined as the ratio of distance moved by the effort to the distance moved by the load . The V.R of a simple machine is 5 means that the distance covered .....
We use our hand and mouth to eat. We chew food with the help of our .....
Retardation mean negative acceleration. If acceleration of car is mentioned -10m/s2. Then its retardation is 10m/s2. but, if acceleration of car is 10m/s2. Then, its retardation is .....
Displacement is the shortest distance between initial position and final position. It is a vector quantity but distance is scalar and has always positive value. So, displacement can be zero whereas distance cannot. for example- -If you travel from .....
Sonar (originally an acronym for sound navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as .....
1.Use relation between Fahrenheit (F) and Kelvin (K) as.... (F-32)/180 = (K-273)/100 2. Put 212 in place of F 3. Find out value of K by .....
Ram is not a .....
Volume of ice block (V) = 50*30*20 cm3 Density of ice d1 = 0.9g/cm3 Density of water d2 = 1gm/cm3 Fraction of block inside the water = d1 /d2 = 0.9/1 = 9/10 Fraction of block outside the water = 1-d1 /d2 = 1-9/10 = .....
Venus and Earth are called planetary twins because of same mass . Earth and Venus both are rocky planets so that they are approximately of same density and also of same size . Except this, both Earth and Venus has significant atmosphere around them .....
William .....
Yuri Alekseyevich .....
Revenue is the income generated from normal business operations which includes discounts and deductions for returned merchandise. Revenue is money brought into a company by its business activities. Revenue is also known as sales Direct tax .....
The glass made by heating silica with potassium carbonate and calcium carbonate is called hard glass. It is used to make test tube, beaker, round bottom flask, etc. Potash lime glass contain three major compounds in varying proportions: silica .....
A joule is SI unit of heat energy. We know, Q= m*s*dt where, Q= amount of heat lost or gained, m = mass of substance, s= specific heat capacity, dt= change in temperature. so, 1 joule heat is defined as amount of heat lost or gained to raise .....
The pivot point around which a lever turns is .....
For the simplification, please use BODMAS rule. For your class, O is not necessary. At first operate inside big bracket [ ] then, operate on mid bracket { } and finally on small bracket ( .....
The coulomb, also written as its abbreviation 'C', is the SI unit for electric charge.
One coulomb is equal to the amount of charge from a current of one ampere flowing for one .....
Let SP be x According to question: x+25% of x = 500 x+x/4 = 500 5x/4 = 500 x=400 SP=x= Rs.400 Again, discount = MP-SP = 500-400 = Rs100 Discount % = (discount /MP) *100% = .....
Applications: 1. It is used in cine projectors. 2. It is used for microscope.to magnify small .....
There are 195 countries in the .....
There is not such formula but you can let present population as final population (PT) and population befor T years as initial population(P): PT = .....
A sewing machine is a machine used to sew fabric and materials together with thread. Sewing machines contain many, many discrete parts, and many of them move. It .....
There can be no any logical answer for the query you have posted. AThe researches and advancement in science and technology till the date, donot help humans to create or destroy a star as seen on science fiction movies. But what was considered .....
The International System of Units (abbreviated SI from the French language name Le Système international d'unités) is the modern form of the metric system. It is the world's most widely used system of units, both in everyday .....
Let, required two digit number be 10x + y According to questioin, y = x + 4 ............ (i) And, xy = 21 ................ (ii) Now, from equation (i) and .....
Bullying is unwanted aggressive behavior. It involves a real or perceived power imbalance. The behavior is repeated, or has the potential to be repeated, over time. But this does not lead to any kind of crime or violent action. It is just a .....
Here, Volume of ice cream in cylinder(V) = πr2h = π x (12cm)2 x 15cm =.......... Volume of ice cream in cone(v) = 1/3 x π r2h + 2/3 x πr3 = 1/3 x π x (3cm)2 x 12cm + 2/3 x π (3cm)3=........ No. of .....
We can know temperature of a body by using .....
For plane mirror, angle of incidence = angle of reflection so, angle of reflection = 30 Note: Angle of incident and reflection are made with the normal ray. but if reflected ray has made 30 degree angle with plane mirror, then reflected angle is .....
Solution: pq= .....
In 1764, Prithivi Narayan Shah ordered his troops to storm the town of Kirtipur for a second time. The Gorkhalis attacked at night under the command of Shah's brother Surpratap. The people of Kirtipur beat off the Gorkhalis again, raining .....
Let ED be height of girl and AC be height of a pole. And, while observing the top of pole , the angle of elevation is found to be 30. AB=AC-BC = 59.24 - 1.5 = 57.74 m Then, Tan 30 = AB/BE or, 0.577 = 57.74/BE or, EB = 100 m So, distance .....
Here, we have to find the value of the f( 5 + h )- f (5 )/h So put x=h+5 in given function. ie; f(h+5)=4(h+5)-3=4h+20-3=4h+17 Similarly, to find f(5), Put x=5, ie; .....
Here, Domain = x = {1, 2, 3} f(x) = y = 2x-1 So, Range = y. When, x = 1, y = 2x -1= 2 ⨯ 1-1 = 2-1=1 .....
Solution: x ≤ SinΘ Sin Θ ≤ y and, value of sin Θ ranges from -1 to 1 x ≤ SinΘ ≤ y -1 ≤ SinΘ ≤ +1 so, x=-1, .....
They are parallel vectors. So, angle between them is .....
Solution : Let first five terms are a/r2, a/r, a, ar and ar2. 1st condition : a/r2 * a/r * a * ar * ar2 = 243 so, a = 3 Again, 2nd condition: 3rd term of GP = 10the term of AP or, 3 = a + 9d Again, s19 = 19/2 [2a+18d] = 19/2 [2(a+9d)] = 19*3 .....
Solution: Let the selling price of 1 book be x the selling price of 12 book = 12x By question : Cost price of 15 books = selling price of 12 books or, Cost price of 1 book = 12x/15 = 4x/5 Then , Profit % =[ (SP-CP)/CP ] * 100% = .....
Solution: mass (m) = 47288 Kg volume (v) = 5 m3 density (d) = ? we know, d = m/v = 47288 / 5 = ......... .....