Gravitation
Chapter 1: Gravitation
- What is the speed of light divided by mass? The speed of light divided by mass does not have a specific physical meaning or a commonly used unit in physics. It is not a meaningful quan... 1
- How to convert 20.1741 to 2.02 20.1741 = 20.17 =20.2 {rounding of to nearest number} then it can be = 20.2 and 2.02 x 10 1
- What is the weight on mars To find out the weights of five friends on the moon and Mars, we need to first understand how the weight of an object changes in different g... 2
- Explain the term earth gravitational force The term "Earth gravitational force" refers to the force that pulls objects towards the Earth. It's the reason things fall when you drop the... 1
- Weight of the person on the mars Person on Mars would weigh 37.83% its weight on earth. 1
- Take weights of five of your friends. Find out what their weights will be on the moon and the Mars. Take weights of five of your friend find out what their weights will be on the moon and the mars Let the weights of my friends a,b,c,d,e be... 3
- std 10th maharashtra board science part 1 gravitation notes Download pdf for offline study 1. study the entries in the following table and rewrite them putting the corrected items in a single row :gra... 2
- g. The mass of the earth is 6 x 1024 kg. The distance between the earth and the Sun is 1.5x 1011 m. the mass of the earth, m = 6 × 10²⁴ kg Assume the mass of the sun is M distance between earth and sun , r = 1.5 × 10¹¹ m force between sun a... 1
- f. The masses of the earth and moon are 6 x 1024 kg and 7.4x1022kg, respectively. The distance between them is 3.84 x 105 km. Given : Mass of the Earth(m₁) = 6 × 10²⁴ kg. Mass of the Moon(m₂) = 7.4 × 10²² kg. Distance between the Earth and the Moon(d) = 3.84 × 10⁵ k... 1
- e. A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m/s2 , calculate its speed Given: t=2s , g=10 m/s² , u=0 , a=g , s=? , v=? Solution : s=ut+1/2 gt² = 0× 1+ 1/2 (10)(1)² = 1/2 (10) s= 5m v=u+gt =0+10*1 v=10 m/s The an... 1
- d. An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? the final velocity is zero. We know the position is 500 and acceleration is 10 Let the initial velocity = u final velocity = v v= 0 m/s s =... 1
- c. The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Mass of the substance remains constant. It is the multiplication of density and volume that will remain unchanged in the whole universe. So... 2
- b. The radius of planet A is half the radius of planet B. If the mass of A is MA, what must be g= GMover R² ⇒ M=gR²/G Acording to the given data , gB/gA=1/2 and tfracR_BR_A=2 ⇒ M_B/M_A=g_B/g_A( R_B/R_A)² ⇒ M_B/M_A=1/22² ⇒ M_B=2M_A Vide... 1
- a. An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet? Given : Time= 5s , Height=5m To find : Gravitational acceleration Formula: S=ut+1/2gt² steps: by formula 5=0× t+1/2g(5)² 5=1/2g×25 therefore... 1
- 4. Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, Thus, when the period of revolution of the planet at a distance R from a star is T, then from kepler's third law of planetry motion, we have... 1
- 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