OSX-2006 Mattias Lecture 3

Question 1

When does resonance occur?

Answer 1

If you force something at its natural period

Question 2

What causes the resonance to occur in a basin?

Answer 2

When the sea happens to be 1/4 of a wave length long, you will end up with a node at the entrance, and a very large amplitude at the inner part of the basin

Question 3

What happens to a damped wave that is reflected?

Answer 3

The energy of the wave will continue to be reduced as it heads back out to sea

Question 4

What does the energy lost to friction depend on?

Answer 4

The cube of velocity

Question 5

What is tidal conversion?

Answer 5

The generation of an internal tide propagating in the stratified layers of the ocean

Question 6

What does conversion depend on?

Answer 6

Square of the velocity

Question 7

Which process dominates in shallow water?

Answer 7

Friction

Question 8

Which process dominates in deep water?

Answer 8

Conversion

Question 9

By how much does tidal friction slow down the Earth’s rotation?

Answer 9

2ms/cy

Question 10

By how much does tidal friction force the moon away from the Earth?

Answer 10

3.8cm/yr - But it has not been constant over time