Question 1
When a workman strikes a steel pipeline with a hammer, he generates both longitudinal and transverse waves. The two types of reflected waves return 2.4 s apart. How far away is the reflection point? (For steel, vL = 6.2 km/s, vT = 3.2 km/s)
Question 2
(Do not try the following: it could kill you. This question is only about a hypothetical possibility.) If you were standing below an object emitting a fixed frequency sound falling at terminal velocity, as it approached you, you would hear the sound
◦
drop in frequency.
◦
stay at the same frequency.
◦
increase in frequency.
◦
decrease in loudness.
◦
stay at the same loudness.
Cell kill and chemotherapy
How to calculate present value (Question 3)
Economics question
Economics question
economic question
economic question