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A small amount of CaCO_(3) completely neutralises 525 mL of 0.1 N HCl and no acid is left in the end. After converting all calcium chlorine to CaSO_(4) , how much plaster of Paris can be obtained ?

An autmobile travelling at 80 km//h has tyres of 75.0 cm diameter. What is the angualr speed of the tyres about their axles ? If the car is brought to stop uniformly in 30 complete turns of the tyres without skidding, what is the magnitude of angular acceleration of the wheels ? How far does the car move during the braking ?

Few days back, our school organised health checkup camp. Eminent doctors (General physicians, opthalmologists, dentist,etc). Doctor X leader of the doctor's team, gave us tips about essential conditions of keeping good health extrinsic and intrinsic causes of disease as well as types of diseases. Enter students of the school were examined by the doctors. Next day our class teacher asked us to anwer to the following questions: (i) List atleast three conditions essential for good health. (ii) How can we keep our surroundings clean? Mention at least two ways. (iii) How would you define a diseases?

When the weight on a string is change from 3.0 kg to 5.0 kgs the elengation changes from 0.61 mm to 1.02 mm. How much work is done during this extension of the string ? Find the Young's modulus of meterical of string if it is 1m in length and has a cross-sectional area 0.4 xx 10^(-4) m^2.