https://mashalscienceacademy.com Seek knowledge from cradle to the grave! Sat, 13 Aug 2022 22:06:26 +0000 en-US hourly 1 https://wordpress.org/?v=5.8.1 https://mashalscienceacademy.com/wp-content/uploads/2020/03/cropped-fav-32x32.png https://mashalscienceacademy.com 32 32 Energy of the waves during interference … msa https://mashalscienceacademy.com/energy-of-stationary-wave-msa/ https://mashalscienceacademy.com/energy-of-stationary-wave-msa/#respond Fri, 12 Aug 2022 08:35:21 +0000 https://mashalscienceacademy.com/?p=29114

Energy of the waves during interference

Consider two forces F1 and F2 of equal magnitudes and opposite directions acting on a point. The combined effect (vector sum) of the forces on the point is zero.

Consider two waves y1 and y2 of equal amplitudes and opposite directions, passing through a point. The combined effect (vector sum) of the waves on the point is zero.

Is there something different?

Yes, one thing is different.

The forces are applied by two material bodies, for example our hands. 

]]> https://mashalscienceacademy.com/energy-of-stationary-wave-msa/feed/ 0 Questions Asked https://mashalscienceacademy.com/questions-asked/ https://mashalscienceacademy.com/questions-asked/#respond Fri, 12 Aug 2022 08:25:28 +0000 https://mashalscienceacademy.com/?p=29112 Questions Asked

Here are the questions asked by the students of MSA. We encourage every one to participate in answering the questions of students on the page.

  1. What happens to the energy of waves during interference? How about the energy of a stationary wave? See Answer
]]> https://mashalscienceacademy.com/questions-asked/feed/ 0 Physics and its role in science, technology and society. https://mashalscienceacademy.com/physics-and-its-role-in-science-technology-and-society/ https://mashalscienceacademy.com/physics-and-its-role-in-science-technology-and-society/#respond Thu, 30 Jun 2022 08:32:00 +0000 https://mashalscienceacademy.com/?p=29055

Question 1: Define Physics. How Physics plays a crucial role in science, technology and society?

Answer

Definition of Physics

Physics is the branch of science that involves the study of physical universe: energy, matter and how they are related.

Explanation: The physical universe is very large. Very large bodies like sun, stars etc. are part of the physical universe. Similarly, very small bodies like sub-atomic particles proton, neutron, electron etc. are also part of physical universe. Physics studies all of them. Therefore, Physics has a big scope.

Physics and other sciences

Physics has a strong relation with all other branches of science. The laws of Physics are generally used in all branches of science like Biology, Chemistry and Astronomy etc. etc.

Role of Physics in the development of technology and society

Like all other sciences, Physics has an important role in the development of technology. Physics has created a lot of knowledge and technology has successfully used that knowledge to invent machines. Machine makes human life comfortable. In this way Physics has a key role in the development and improving the quality of life.

]]> https://mashalscienceacademy.com/physics-and-its-role-in-science-technology-and-society/feed/ 0 Comprehensive Questions on Measurement, Physics 9 https://mashalscienceacademy.com/comprehensive-questions-on-measurement-physics-9/ https://mashalscienceacademy.com/comprehensive-questions-on-measurement-physics-9/#respond Thu, 30 Jun 2022 08:08:33 +0000 https://mashalscienceacademy.com/?p=29043

Comprehensive Questions on Measurement for grade 9

Find here solved comprehensive questions included in the Physics course of chapter 1 for class 9.

S.No

Statement of the question

Question 1

Define Physics. How Physics plays a crucial role in science, technology and society?
See Answer

Question 2

]]> https://mashalscienceacademy.com/comprehensive-questions-on-measurement-physics-9/feed/ 0 Calculate resistance when V and I are given … Physics 11 https://mashalscienceacademy.com/calculate-resistance-when-v-and-i-are-given-physics-11/ https://mashalscienceacademy.com/calculate-resistance-when-v-and-i-are-given-physics-11/#respond Wed, 01 Jun 2022 11:28:31 +0000 https://mashalscienceacademy.com/?p=28872

Assignment 1.3: The voltage V(V ± ΔV) is measured (7.3 V ± 0.1V) and current I(I ± ΔI) is measured as (2.73 A ± 0.05 A). Calculate the resistance R by using Ohm’s law as R = V/I.

Solution

Put values in the given formula

To find final result in division, the percentage uncertainties are added. Therefore, percentage uncertainty in voltage 

 

Percentage uncertainty in current,

Add sums of percentage uncertainties, 1.37% + 1.83% = 3.2%

Therefore,

Now to convert to fractional uncertainty, 

]]> https://mashalscienceacademy.com/calculate-resistance-when-v-and-i-are-given-physics-11/feed/ 0 Difference in the thickness of wall, Assignment 1.2, Physics 11 https://mashalscienceacademy.com/difference-in-the-thickness-of-wall-assignment-1-2-physics-11/ https://mashalscienceacademy.com/difference-in-the-thickness-of-wall-assignment-1-2-physics-11/#respond Tue, 31 May 2022 10:06:42 +0000 https://mashalscienceacademy.com/?p=28858

Assignment 1.2: A physicist calculated the wall width of half brick thickness (the brick is laid in a flat position, lengthwise called stretcher position), as (13.6 ± 0.1) cm. And one brick thickness (the brick is placed in flat position, lengthwise orthogonal to wall, called header position), as (23.6 ± 0.1) cm. Calculate difference in width of walls with uncertainty in it.

Solution

Width of the first brick (half brick wall), w1 = (13.6 ± 0.1) cm

Width of the second brick (full brick wall), w2 = (23.6 ± 0.1) cm

For finding the uncertainty in the difference, we add the uncertainties in the two measurements in the result (sum).

Difference in the widths of walls = (23.6 ± 0.1) cm – (13.6 ± 0.1) cm = (23.6 – 13.6)cm ± (0.1 + 0.1)cm =  10 cm ± 0.2 cm. (Answer)

]]> https://mashalscienceacademy.com/difference-in-the-thickness-of-wall-assignment-1-2-physics-11/feed/ 0 Finding depth of the well from the pulley, Assignment 1.1, Physics 11 https://mashalscienceacademy.com/finding-depth-of-the-well-from-the-pulley-assignment-1-1-physics-11/ https://mashalscienceacademy.com/finding-depth-of-the-well-from-the-pulley-assignment-1-1-physics-11/#respond Tue, 31 May 2022 07:19:59 +0000 https://mashalscienceacademy.com/?p=28837

Assignment 1.1: A pulley of radius 0.9 m is used to lift a bucket from the well. If it took 3.6 rotations for the pulley to take water out of the well, how deep is water in the well?

Solution

 Now one rotation = 2π rad, therefore, we can calculate the angle traversed by the pulley in 3.6 rotations, which is 3.6 × 2π = 3.6 × 2 × 3.14 = 22.608 rad. Since s = rθ, this implies the corresponding length of the arc (linear distance), s = 0.9 × 22.608 = 20.3 m.

]]> https://mashalscienceacademy.com/finding-depth-of-the-well-from-the-pulley-assignment-1-1-physics-11/feed/ 0 Fluid Dynamics, Numerical Problem 5 … msa https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-5-msa/ https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-5-msa/#respond Sun, 30 Jan 2022 05:01:13 +0000 https://mashalscienceacademy.com/?p=28757

Problem 5: A small circular hole 6.00 mm in diameter is cut in the side of a large water tank, 14.0 m below the water level in the tank. The top of the tank is open to the air. Find (a) the speed of efflux of the water and (b) the volume discharged per second.

Solution

Given
Dia of the hole = d = 6 mm = 6 × 10-3 m
Height of the water cloumn above the hole = 14 m

Required

(a) Speed of efflux

(b) Volume (V) discharge rate

Required

(a) Speed of efflux

(b) Volume flow rate

Formulae

(1) Torricelli’s Theorem,

(2) Volume flow rate

(3)

Comprehension: In Torricelli’s theorem, ‘h’ is the height of water level from the hole. Similarly, it is given that the top of the tank is open, therefore, pressure on water is constant which atmospheric pressure.

Calculation: (a) Apply formuls (1) to find ‘v’, velocity of efflux.

(b) Apply formula (2) to find the volume flow rate by putting the value of ‘A’ from formula (3) and ‘v’ from equation (1),

 

 

 

]]> https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-5-msa/feed/ 0 Fluid Dynamics, Numerical Problem 4 https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-4/ https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-4/#respond Fri, 28 Jan 2022 05:20:08 +0000 https://mashalscienceacademy.com/?p=28596

Problem 4: A venturi meter is measuring the flow of water; it has a main diameter of 3.5 cm tapering down to a throat diameter of 1.0 cm. If the pressure difference is measured to be 18 mm Hg, what is the speed of water entering the venturi throat?

Solution

Given

Main diameter = 3.5 cm = 0.035 m = d1 (say)
Cross-sectional area of main diameter =
Density of water = ρ = 1000 kg/m3

Throat diameter = 1.0 cm = 0.01 m = d2 (say) Cross-sectional area of the throat diameter = Pressure difference = 18 mm-Hg = 18 × 133 = 2394 pascals

Required

Velocity of water

Formula

Solution

Knowing the pressure difference and areas of cross-sections, put values in the formula to find the velocity of water.

Before handing on the solution, we must know that,
A = πr2 = π(d/2)2 and 1 mm-Hg = 133 pascal

]]> https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-4/feed/ 0 Fluid Dynamics, Numerical Problem 4 … msa https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-4-msa/ https://mashalscienceacademy.com/fluid-dynamics-numerical-problem-4-msa/#respond Thu, 27 Jan 2022 03:57:15 +0000 https://mashalscienceacademy.com/?p=28598

Problem 4: A venturi meter is measuring the flow of water; it has a main diameter of 3.5 cm tapering down to  throat diameter of 1.0 cm. If the pressure difference is measured to be 18 mm Hg, what is the speed of the water entering the venturi throat?

Solution

Given
Main diameter = 3.5 cm = 0.035 m = d1(say)
Cross-sectional area of main dimeter

Throat diameter = 1.0 cm = 0.01 m = d2(say)
Area of the throat diameter =

Pressure difference = 18 mm Hg = 18 × 133 = 2394 pascals
Density of water = ρ = 1000 kg/m3

Pre-requisite

Before putting hand on the problem, we should know that,

(1) 1 mm of Hg = 133 pascal

(2) If ‘d’ is the diameter of the cross-sectional area, then the area ‘A’ of the cross-section is given by,

A = πr2
where ‘r’ is the radius of the cross-sectional area = d/2.

Required: Velocity of water, v

Formula

Put values in the formula;

 

 

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