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. What type of motion is shown by a curved line on a position vs time graphAccelerationAt restConstant velocity2. Which produces a greater tidal effect in your body, the moon or a 1-kg melon held above your head?The melonThe moonNot enough information is given to make a reasonable estimate.3. The best time for digging clams (when the low tide is extra low) is during the time of theQuarter moon.Half moon.None of these times in particularNew or full moon.4. Which of these three produces the greatest tidal effect on you right now?The moonThe sunThe earth5. The Earth is closer to the sun in January than in July, which accounts for the fact that the highest high tides in the northern hemisphere occur inSummer.Particular time because tides do not depend on seasons.Winter.Spring.6. The gravitational field lines close to the earth are equidistant and parallel. What does this mean?The field lines cancel outThe gravitational field increases linearlyThe gravitational field is constantThe gravitational field decreases linearly7. With the left arm held out to the side and elbow fully extended and a coordinate system origin at the elbow joint. The hand could be said to have a polar coordinate of (30 cm, 0 degree) which of the following could represent the coordinate of the hand with the elbow flexed to 90 degrees30cm, 90 degree30cm, 0 degree0cm, 90 degree0 degree, 30cm8. Inside a freely falling elevator, there would be noApparent weight for you.Both of theseGravitational force on youNone of these9. What is the acceleration of an object whose net force is 150N and has a mass of 25kg10m/s/s5N6N6m/s/s10. Which of the following is a scalar quantitySpeedDisplacementAccelerationVelocity11. We do not observe tides in a community swimming pool becauseThey are masked by the much stronger pull of Earth gravityIt is shallow compared to the ocean.All parts of it are practically the same distance from the moon.Gravitation on the small mass of water is negligibly small.12. 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 becauseJupiter's radius is 10 times the Earth's radius.Your mass is 100 times less on Jupiter.Jupiter is significantly farther from the sun.You are 100 times more weightless there13. A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there?200 N400 N100 N014. 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?Only certain electron transitions are possible in a hydrogen atom.Hydrogen atoms contain only one electron.Hydrogen gas changes in the presence of light.Hydrogen gas is invisible and does not reflect light.15. The amount of potential gravitational energy possessed by an object is not proportional toHeightMassGravitySpeed16. A 2N force vector point up and to the right forming on angle of 45 with the horizontal another 2N force vector points up and to the left also forming a 45° angle above the horizontal what is the direction of the sum of these two vectorsuprightdownleft17. 241318. When calculating the force of gravity between two objects, you need to measure the distance between:Two arbitrary points within the objects' massThe points where the objects surfaces are farthest away from each otherThe points where the objects surfaces are closest to each otherThe centers of mass of the two objects19. What is the field strength?Force acting per unit mass on a point massGravitational Potential Energy per unit mass acting on a point massForce acting on a point massGravitational Potential Energy acting on a point mass.20. Two objects move toward each other because of gravity. As the objects get closer and closer, the force between themIncreases.Decreases, then increases.Increases, then decreases.Decreases.21. On a given day, tides rise and fall atDifferent times and different distances almost everywhere.The same time and the same distance everywhere.The same distance everywhere.The same time everywhere.22. Unit of G is ?N m2 / kg2N m2 kg2N m/kgN kg2/m223. What is the net force on an object that is being pushed with 80N of force but has 10N of friction acting on it?70N90N80N10N24. Tidal forces in general are the result ofThe inverse-square law.Unequal forces acting on different parts of a body.Two or more sources of gravitation.A combination of any kind of forces acting on a body.25. Define Gravitational Potential Energy at point P.Work done in moving a test mass from the floor to a point PWork done in moving a test mass from infinity to a point PWork done in moving 1Kg from infinity to a point PWork done in moving 1Kg from the floor to a point P26 out of 25Time is Up!