The Sears Tower in Chicago is 443 m tall. Joe wants to set the world’sstair climbing record and runs all the way to the roof of the tower. If Joe’saverage upward speed is 0.60 m/s, how long will it take Joe to climb fromstreet level to the roof of the Sears Tower?

Why there is no inductive reactance in dc circuits

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

What causes the formation of ocean currents?