Question: A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When

A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits a sound with a fundamental frequency of 678 Hz. The copper object is then submerged in water so that half its volume is below the water line. Determine the new fundamental frequency. Hz

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=+4. How many investors will she have to call, on average, to find someone interested?

=+3. How many people will she have to call until the probability of finding someone interested is at least 0.50?

=+2. What is the probability that none of the first five people she calls will be interested?