+91-8076753736[email protected]
logo
logo
-->

Is Matter Around Us Pure

Question
CBSEENSC9005855
Wired Faculty App

A truck starts from rest and rolls down a hill with constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tonnes (Hint: 1 metric tonne = 1000 kg.)

Solution
space Here I n i t i a l space v e l o c i t y comma space straight u space equals space 0 D i s tan c e space t r a v e l l e d comma space straight s space equals space 400 space straight m Time space taken comma space space straight t space equals space 20 space straight s therefore space space space U sin g space t h e space e q u a t i o n space o f space m o t i o n comma space space space space space space space space space space space space space space space space space space space space space space straight s space equals space ut space plus space 1 half at squared rightwards double arrow space space space space space space space space space space space space 400 space equals space 0 plus 1 half straight a left parenthesis 20 right parenthesis squared space space space rightwards double arrow space space space space space space space space space space space space space space space space space space straight a space equals fraction numerator 400 space cross times space 2 over denominator 400 end fraction space equals space 2 straight m divided by straight s squared Now comma space space space space M ass comma space straight m space equals space 7 space metric space tonne space equals space 7000 space kg A c c e l e r a t i o n comma space straight a space equals space 2 straight m divided by straight s squared therefore space space space Force comma space space straight F space equals space ma space equals space 7000 cross times 2 space equals 14 comma 000 straight N.

Some More Questions From Is Matter Around Us Pure Chapter

Which separation techniques will you apply for the separation of the following?

Oil from water.

Which separation techniques will you apply for the separation of the following?

Tea leaves from tea

Which separation techniques will you apply for the separation of the following?

Iron pins from sand.

Which separation techniques will you apply for the separation of the following?

Wheat grains from husk

Which separation techniques will you apply for the separation of the following?


Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66

What is the effect of change of temperature on the solubility of a salt?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation