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CBSE PHYSICS: Enrich your study: IX:Force and laws of motion

CBSE PHYSICS: Enrich your study: IX:Force and laws of motion sol... : CBSE PHYSICS: IX:Force and laws of motion solved Problems 1. An athlete runs a certain rest before taking a long jump. Why? Solution: An... CBSE PHYSICS: IX:Force and laws of motion solved Problems  1. An athlete runs a certain rest before taking a long jump. Why? Solution: An athlete runs a certain distance to accelerate himself and gain enough momentum so that he can jump through the maximum possible length. 2. Springs are provided in car seats. Why? Solution: The springs in the car seats absorb shock (sudden jumps) due to the roughness of the road. Thus, making the ride more comfortable. 3. A gun of mass 1500 kg fires a shell of mass 15kg with velocity 150 m/s. calculate velocity of recoil of the gun. Solution: Before firing, total momentum of the gun and shell is = 0 (they were all at rest) After firing, the momentum of the shell = 15 X 150 = 2250 Ns The momentum of the gun is = 1500v Ns By conservat

X : 10th Acid Base and Salt:Solved Edugain questi...

chemistry X : 10th Acid Base and Salt:Solved Edugain questions Q. 1.  What happens if sodium hydroxide is added to cupper    ammonium sulphate solution and what is the inference? Answer:  When sodium hydroxide is added to cupper  ammonium sulphate solution, no blue precipitate of Cu(OH) 2  is seen, which is normally  observed  for Cu 2+  ion. Hence it is an example of a complex salt. Q 2. When lead dioxide reacts with concentrated HCl and produces a salt and water, the reaction is  not called  a neutral reaction why? Answer:  For a reaction to be called a neutral reaction the products should be only salt and water. But in the above reaction, Cl 2  gas is also  liberated . Q 3.Define a base and acid in terms of proton. Answer:  A base is a proton acceptor and an acid is a proton donor. Q 4. Answer these:   1) Name the anions that can be detected in the laboratory using dilute HCl or dilute H 2 SO 4  and give the ionic equation common to both reactions.   2) Which property of the a

CBSE MATH STUDY: Linear Equation solved hots questions

Q. Places A and B are 100kms apart on a highway. One car starts from  A and another starts from B at the same time. If the car travels  in the same direction at different the speeds, they meet in 5hrs.If they travelled towards each other they meet in 1hr.What are the speeds of the two cars? Let the speed of 1st car and 2nd car be x km/h and y km/h. Respective speed of both cars while they are travelling in same direction = (x-y) km/h Respective speed of both cars while they are travelling in opposite directions i.e., travelling towards each other = ((x + y) km/h According to the given information, First case, in the same direction A and  B meet in 5hrs Distance cover to meet = distance x time 5 (x-y) = 100      Þ        x – y =100/5             Þ      x- y  = 20          Þ  x = 20+y Second case, If they travelled towards each other they meet in 1hr, 1(x+y)    = 100    Þ      20+y +y =100 2y= 100-20=80 Y=80/2=40 So, x = 100 – 40= 60 Hence, speed of one car = 60 km/h and speed of other

Class X Chapter 14 – Sources of Energy Science Not...

CBSE PHYSICS: Class X Chapter 14 – Sources of Energy Science Notes.   Read full Post 10th std: Sources of energy videos Just click following links click go... A.   Hydroelectricity B.   Tidal energy C.     windmills D.   wave energy E.    Thermal electricity F.    ocean thermal energy G.   Biogas H.   Geothermal energy I.     Nuclear reactor J.    Renewable and non renewable resources K.   Solar cells L.    Nuclear fusion and nuclear fission M.   Types of nuclear reactions N.   Tidal energy You might also like: Class X Chapter 14 – Sources of Energy Science Notes and MCQ Chapter Source of Energy class 10 th  CBSE FORMATIVE ASSESSMENT Paper-1 Extra score questions for Ch: Sources of energy 10th source of energy solved important questions Solved GIST OF THE LESSON CBSE PHYSICS: