46. Since the introduction of the cellular phone, many advances in wireless communication have been made. Which of the following features has been added to cellular phones for the purpose of finding someone who has placed an emergency call?
48. Message signs and arrow boards are used to direct traffic and safeguard workers on roads and highways. These devices were originally run by dieselpowered generators.Which of the following provides a practical way to power these mobile devices and is more efficient than a generator?
49. A contractor needs to choose a low-density material for use in the construction of a building. When comparing two materials of the same size, the less dense material always gives a building structure which of the following characteristics?
50. A manufacturer has developed a textured surface for plastic cups. These cups are designed for small children. The manufacturer has produced prototypes.Which of the following is the next step in the engineering design process?