29/03/2020Gravitational Fields(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Gravitational Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. If the moon were covered with water, tidal effects caused by the Earth would find the moon with 3 tidal bulges. 1 tidal bulge. 4 tidal bulges. 2 tidal bulges.2. Magnitude of acceleration Mass Kinetic energy Magnitude of momentum3. Inside a freely falling runaway elevator, your Apparent weight is zero. All of these Gravitational interaction with the Earth is zero. Acceleration is zero.4. No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is Always false. Always true while in orbit. Sometimes true while in orbit.5. What is the weight of an object on earths surface which weighs 60 N on moon's surface ? 360 N 60 kg 2 kg 10 N6. What is the net force on an object that has a 45 N force and a 10N force acting int he same direction? 10N 45N 35N 55N7. When the distance between two stars decreases by half, the force between them Decreases by one-quarter. Increases to twice as much. Increases to four times as much. Decreases by one-half.8. The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have 1/4 the weight. 1/2 the weight. Practically the same weight9. Which of the following would be different for the same object on earth vs the moon Density Mass Kg Weight10. During an eclipse of the sun the high ocean tides on Earth are Extra high. Extra low. Not particularly different.11. How can you calculate the potential at the surface of the earth? Gravitational Potential = (gravitational field strength)x (radius of planet) Gravitational Potential = (gravitational field strength)/(Radius of planet) Gravitational Potential = gravitational field strength12. Some of the work done on the cart became the cart’s potential energy, and some of the work was converted into heat by friction. All the work done on the cart was transformed into the cart’s potential energy. The cart had no kinetic energy at the top of the ramp because all the work done on the cart was converted into heat by friction. The work done on the cart was equally divided between the cart’s potential and kinetic energy.13. According to Keler, the path of a planet's orbit is in the shape of _____________ A circle, with the earth at the center An ellipse, with the earth at one of the foci A circle, with the sun at the center An ellipse, with the sun at one of the foci14. Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each Decreases. Remains constant Increases.15. 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 You are 100 times more weightless there Jupiter is significantly farther from the sun. Your mass is 100 times less on Jupiter. Jupiter's radius is 10 times the Earth's radius.16. What will be the mass of the object on moon surface whose mass is 60 kg on earth's surface 60 kg 10 N 60 N 10 kg17. We do not observe tides in a community swimming pool because All parts of it are practically the same distance from the moon. They are masked by the much stronger pull of Earth gravity Gravitation on the small mass of water is negligibly small. It is shallow compared to the ocean.18. According to Newton's Law of Universal Gravitation, which of the following do you NOT need to know in order to calculate the force of gravitational attraction between 2 objects? Mass of the smaller object Distance between the two objects Radius of the larger object Mass of the larger object19. Which of these three produces the greatest tidal effect on you right now? The sun The moon The earth20. 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? 80N 8000N 8N 800N21. 3 1 2 422. What is the value of Gravitational acceleration on the surface of the moon ? 9.8 m/s2 15 m/s2 1.608 m/s2 33 cm/s223. What type of motion is seen by a flat line on a velocity vs time graph? Constant velocity At rest Acceleration constant acceleration24. Where is the value of Gravitational acceleration minimum ? Equator Tropic of cancer Poles Alps - Europe25. 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. Hydrogen gas is invisible and does not reflect light. Hydrogen gas changes in the presence of light. Only certain electron transitions are possible in a hydrogen atom.26 out of 25Time is Up!