GS5. Which of the following is a greenhouse gas? University Of Sindh mcqs test

  

GRAVITATION

 (PROBLEMS)

Problem 6.1. A 10 kg mass is at a distance of 1 m from a 100 kg mass. Find the gravitational force of attraction when (i) 10 kg mass exerts force on the 100 kg mass (ii) 100 kg mass exerts force on the 10 kg mass.

Problem 6.2. Compute gravitational acceleration at the surface of the planet Jupiter which has a diameter as 11 times as compared with that of the earth and a mass equal to 318 times that of earth.

Problem 6.3. The mass of the planet Jupiter 1.9 × 10^27kg and that of the sun is 2.0 × 10^30kg. If the average distance between them is 7.8 × 10^11m, find the gravitational force of the sun on Jupiter.

Problem 6.4. The radius of the moon is 27% of the earth's radius and its mass is 1.2% of the earth's mass. Find the acceleration due to gravity on the surface of the moon. How much will a 424N body weight there?

Problem 6.5. What is the value of the gravitational acceleration at a distance of (i) earth's radius above the earth's surface? (ii) Twice earth's radius above the earth's surface?

Problem 6.6. At what distance from the center of the earth does the gravitational acceleration have one half the value that it has on the earth's surface?

Problem 6.7. Compute the gravitational attraction between two college students of mass 80 & 50 kg respectively, 2m apart from each other. Is this force worth worrying about? 

Problem 6.8. Determine the gravitation between the proton and the electron in a hydrogen atom, assuming that the electron describes a circular orbit with a radius of 0.53 × 10^−10, (mass of proton = 1.67 x 10^-27kg, mass of electron = 9.1 × 10^-31kg).

Problem 6.9. A woman with a mass of 45 kg is standing on a scale in an elevator. The elevator accelerates with a constant acceleration of 1.2m/s^2. What is the woman's weight as measured by her in the elevator.