1. The gravitational force due to the Sun on the planets in our solar system decreases as the planetary distance from the Sun increases. In your notebook, draw a larger version of Figure 3, and complete it for the force of gravity on an imaginary Earth-mass planet if its distance were between the Sun's radius, rs, and 100rs.
2. A metal-coated table tennis ball with a mass of 2.1 g is suspended by an insulating thread. A similar table tennis ball touches the first, giving each ball an equal negative charge. When the two balls are separated horizontally by 5.0 cm, the string hangs at 15° with respect to the vertical.
