Doubtly
@Doubtly · Joined Feb 2021
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- 3. Explain why the value of g is zero at the centre of the earth. Acceleration due to the earth's gravity is zero at the centre of the Earth because at that point the mass of the earth is equally distribute... 1
- e. If the value of g suddenly becomes twice its value, it will become two times more difficult to pull a heavy object along the floor. Why? Let the mass of the heavy object be m. Thus, the weight of the object or the pull of the floor on the object is W=mg Now, if g becomes twice... 2
- d. A stone thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Let us consider an object which is projected vertically upwards with initial velocity u which reaches a maximum height h. Acceleration due t... 1
- c. Write the three laws given by Kepler. How did they help Newton to arrive at the inverse square law of gravity? Kepler's first law: The orbit of a planet is an ellipse with the Sun at one of the foci. Kepler's Second law: The line joining the planet an... 2
- b What are (i) free fall, (ii) acceleration due to gravity (iii) escape velocity (iv) centripetal force ? (i) Free Fall: Whenever an object moves under the influence of the force of gravity alone, it is said to be in Free Fall. During free fall i... 1
- a. What is the difference between mass and weight of an object. Mass is the amount of matter present in an organism while weight of an object is mass along with gravitational force I. e. W=Mg. Mass of an... 1
- 1. study the entries in the following table and rewrite them putting the corrected items in a single row Answer: 123 MasskgMeasure of inertia WeightNZero at the centre (of the earth) Acceleration due to gravitym/s²Depends on height Gravitational... 1
- (5) Outline the importance of field-visit. Field visit helps in developing geographical concepts, elements and processes through direct personal experiences. It helps in understanding... 1
- (4) What items will you take with you for the field visit? I will take the following items with me for the field visit: Notebook, pen, pencil, camera, binoculars, etc to collect information. I-card,... 1
- (3) How will you manage the litter during the field visit? We will collect all the litter of the in-between journey in a carry bag and will throw them in a dustbin available inbetween or at destinati... 1
- (2) Prepare a questionnaire for a field visit to a factory. A questionnaire for a field visit to a factory will be as follows: Which product is manufactured in the factory? What are the raw materials... 2
- (1) Make a report on your field visit We started our trip from Naldurg towards Alibag. Our station was Solapur. We critically observed the places on the basis of 1. Relief 2. Veg... 1
- An object when placed at 10 cm from convex lens & when placed at 20 cm from it, image produced has same height. Find focal length of lens? The correct answer is 15 cm 1
- A screw gauge shows 8 division on circular scale below reference line when no object is placed. Number of division on circular scale Least count = 1/100mm positive error =+0.08 mm Measured reading (Diameter) = 1mm+ 72×(1/100)mm Original (True reading) = 1.72 – 0.08 = 1.64... 1
- Two particles having mass M1 = 4 gm, M2 = 16 gm. If kinetic energy of both the particle is equal then ratio of their momentum is n : 2 then n is: K₁=K₂ --given ⇒ p₁²/2m₁=p₂²/2m₂ ⇒ (p₁/p₂)²=m₁/m₂ ⇒ (p₁/p₂)=√(m₁/m₂) ⇒ √(m₁):√(m₂) given m1=4g m2=16g ⇒ √(4):√(16) ⇒ √(1):√(4) ⇒1:2n:2 = 1:2... 1
- College Profile, Computer Manufacturer or Software Development Company. College Profile This question is answered on this link https://doubtly.in/335/computer-science-college-website-project-maharashtra-board?sho... 3
- Write a C++ program to find the factorial of a inputted number #include<iostream.h> #include<conio.h> void main() { int i,n; long int fact; clrscr(); cout<<"Enter the number to find the Factorial"<<endl;... 1
- Write a C++ program to replace every space in an inputted string (less than 80 characters) with a hyphen #include<iostream.h> #include<conio.h> #include<string.h> void main() char str[80]; int i, len; cout<<"Enter a string : "; cin.getline(str,8... 3