Q1. If it takes 4.0 J of work to stretch a Hooke's-law spring 10.00 cm from its unstressed length, determine the extra work required to stretch it the additional 10.00 cm.
Q2. The speed of light is c = 3.0 x 10^8 m/s. This is quite fast. In this problem, you will explore just how fast.
Many communications satellites orbit the earth in geostationary orbits. (They appear to remain in the same positions in the sky for observers on the earth's surface.) If such a satellite orbits at a height of 40,000 km, estimation the time delay in a cell phone conversation by reason of the time it takes light to travel from one phone to the other via the satellite.