29/03/2020 Gravitational Fields(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Gravitational Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The main reason ocean tides exist is that the pull of the moon Is greater on the Earth because the moon is closer to Earth. And sun are in conjunction at high tides and in opposition at low tides. And the sun on the oceans are in opposite directions Is greater on oceans closer to the moon and less on oceans farther from the moon. 2. The gravitational field strength on the earth's surface is approximately 10 N/kg. What will the gravitational force acting on a person whose mass is 80kg be? 8000N 800N 80N 8N 3. Inside a freely falling runaway elevator, your Acceleration is zero. All of these Apparent weight is zero. Gravitational interaction with the Earth is zero. 4. 4 3 1 2 5. What is the unit gravitational force ? Kg Kelvin Metre Newton 6. What is the field strength? Force acting on a point mass Force acting per unit mass on a point mass Gravitational Potential Energy acting on a point mass. Gravitational Potential Energy per unit mass acting on a point mass 7. Suppose the moon had twice as much mass as it now does and still orbited the Earth at the same distance. In that case, the ocean bulges on Earth would be Smaller. Unequal in size. Not significantly different. Larger. 8. What happens to the gravitational force between you and your neighbour if the distance between you doubles? Force becomes smaller by a factor of 2 Nothing Force becomes smaller by a factor of 4 Force becomes 2x as great 9. Describe the lines of equipotential near to a large mass. none of the above Lines move radially away from the centre of the mass Lines are concentric and spaced equidistant from each other Lines are concentric and spaced further apart from each other as they move away from the centre of the mass. 10. According to Newton, doubling the distance between two interacting objects Divides by 2 the gravitational force between them. Multiplies by 2 the gravitational force between them. Divides by 4 the gravitational force between them. Multiplies by 4 the gravitational force between them. 11. What is the order of magnitude of the gravitational force between you and the person that sits next to you in class? 10^-5 N 10^-11 N 10^-9 N 10^-7 N 12. According to Keler, the path of a planet's orbit is in the shape of _____________ A circle, with the earth at the center A circle, with the sun at the center An ellipse, with the sun at one of the foci An ellipse, with the earth at one of the foci 13. You have 3 round objects of equal mass and equal radius, but different shapes. Which of the following shapes will have the largest moment of inertia? A solid sphere They are all equal A solid disk A hollow ring 14. If the distance between two objects is doubled, what happens to the force of gravitational attraction between them? It doubles It is cut in half It stays the same It is 1/4 as strong 15. Magnitude of acceleration Mass Kinetic energy Magnitude of momentum 16. What happens to the gravitational field strength on the earth if the object in the field has twice as much mass. Field strength increases by a factor of 2 Nothing Field strength increases by a factor of 4 Field strength decreases by a factor of 2 17. Where is the value of Gravitational acceleration minimum ? Poles Alps - Europe Tropic of cancer Equator 18. Which one of the following is true ? Gravitational force is directly proportional to masses of two bodies None Gravitational force is directly proportional to square of distance between two bodies Gravitational force is indirectly proportional to masses of two object 19. What is the acceleration of an object whose net force is 150N and has a mass of 25kg 10m/s/s 6N 5N 6m/s/s 20. When calculating the force of gravity between two objects, you need to measure the distance between: The centers of mass of the two objects The points where the objects surfaces are farthest away from each other The points where the objects surfaces are closest to each other Two arbitrary points within the objects' mass 21. No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is Always true while in orbit. Sometimes true while in orbit. Always false. 22. The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because Jupiter's radius is 10 times the Earth's radius. Jupiter is significantly farther from the sun. You are 100 times more weightless there Your mass is 100 times less on Jupiter. 23. If the force acting on a cart doubles, what happens to the cart's acceleration It stays the same. It halves. It doubles It quarters. 24. The amount of matter in an object Weight Mass Gravity Acceleration 25. Using a diffraction grating, a student looks at an incandescent lightbulb and a hydrogen-gas–discharge tube. Why does the student see fewer colors from the hydrogen-gas–discharge tube than from the incandescent lightbulb? Hydrogen atoms contain only one electron. Only certain electron transitions are possible in a hydrogen atom. Hydrogen gas is invisible and does not reflect light. Hydrogen gas changes in the presence of light. 1 out of 25 Time is Up! Time's up