+91-8076753736 [email protected]

-->

Is Matter Around Us Pure

Question

Wired Faculty App

An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms^–1 to 8 ms^–1 in 6 s. Calculate the initial and final momentum of the object. Also find the magnitude of the force exerted on the object.

Solution

Here comma space M a s s space o f space t h e space o b j e c t comma space straight m space equals space 100 space kg I n i t i a l space v e l o c i t y comma space u space equals space 5 space ms to the power of negative 1 end exponent F i n a l space v e l o c i t y comma space space straight v space equals space 8 space ms to the power of negative 1 end exponent T i m e comma space straight t space equals space 6 space straight s Initial space momentum comma space straight p subscript 1 space equals space mu space equals space 100 space cross times space 5 space equals space 500 space kg space ms to the power of negative 1 end exponent. space Final space momentum comma space straight p subscript 2 space equals space mu space equals space 100 space cross times space 8 space equals space 800 space kg space ms to the power of negative 1 end exponent. space The space magnitude space of space the space force space exerted space on space the space object space i s space g i v e n space b y comma space space straight F space space equals space fraction numerator straight p subscript 2 minus straight p subscript 1 over denominator straight t end fraction space equals fraction numerator 800 minus 500 over denominator 6 end fraction space equals space 300 over 6 equals space 50 space straight N. space

Some More Questions From Is Matter Around Us Pure Chapter

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?

Explain the following giving examples:

Saturated solution

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation