An Experiment for Determining the Value of the Universal Gravitational

question 68

Multiple Choice

An experiment for determining the value of the universal gravitational constant G was devised by Jolly. He placed a 5.00-kg sphere on a balance and, after it was balanced, he moved a 5775-kg lead sphere under the 5.00-kg sphere, causing the balance to tilt off its equilibrium position. The distance between the centers of the two spheres was 0.569 m. Knowing that G = 6.67 x 10^-11 N·m²/kg², what mass did he need to add to the other side of the scale to bring it back in balance?

• A) 0.606 mg
• B) 5.94 mg
• C) 3.39 mg
• D) 0.345 mg
• E) 0.912 N