my big test is on monday

[camuhrun]

can someone please make up a couple dive table problems that involve three dives for me to figure out...i've made up my own but if i'm doing it wrong i wont know the actual answer...i'd really appreciate it!!!

thanks!

 

[tkrock]

Download the software from here! http://www.scubatoys.com/store/software/software.asp

Larry will give any SB member a full version free (pretty sure). Just email him and tell him. The intial download is shareware, he'll then unlock it for you after you email him.

You can do them all night long then!!!!!

 

[camuhrun]

someone check this to make sure i'm right please

1st dive - 70 ft for 30 min
SIT 2 hrs
2nd dive - 50 ft 49 min
SIT 3 hrs
3rd dive 42 ft max time 42 minutes??

also, what are the best procedures when diving from a boat in a current. I dont think i wrote it down in my notes. i'm confused b/c in my mind i thought we talked about jumping from the front of a boat b/c the current would move you along side the boat. but then im thinking that might be more dangerous b/c the boat could move and pass over you...

 

[BigboyDan]

Are you funnin us? Really.

 

[knotical]

someone check this to make sure i'm right please

1st dive - 70 ft for 30 min
SIT 2 hrs
2nd dive - 50 ft 49 min
SIT 3 hrs
3rd dive 42 ft max time 42 minutes??

also, what are the best procedures when diving from a boat in a current. I dont think i wrote it down in my notes. i'm confused b/c in my mind i thought we talked about jumping from the front of a boat b/c the current would move you along side the boat. but then im thinking that might be more dangerous b/c the boat could move and pass over you...

You didn’t mention what agency you are training with, but if it’s PADI, I don’t get 42 minutes as max time for the third dive.

Some common errors include:
- accidentally shifting one row or column.
- in table 3, using the number in blue instead of the one in white
- in table 2, converting from hours and minutes to total minutes. (Table 2 is in hours and minutes but tables 1 and 3 are in total minutes.)
- not using the tables in the correct sequence
- etc.
Perhaps if you tell us what pressure groups (letters) you got at each step, we could help you better.

What you might be remembering about diving in currents is to start your dive swimming into (against) the current (often toward the bow/front of the boat, if anchored). That way you don’t have to fight the current as you return to the boat. You might want to review the section on boat diving in your book or CD.

Enjoy the rest of your class.

 

[RonFrank]

The test is rather easy, and a 75% is passing, and it's multiple guess.

The thing that threw most students in my class was that sometimes there are more than one answer that is right, but one answer will be better or more complete than the others.

Using tables the RDP dive problems are simple as there will be only one right chioce. Make sure you don't drop a row or jump a column when using the table.

This is hardly a *big* test with the multiple guess and 50 questions.

Good Luck

 

[whitedragon13]

Depends on how big the balloon is.
If it's one of those little ones, it's not going to contain any because iz gonna 'splode before it gets to the surface.

Definitely depends on the balloon...
The radius only expands from .68 to 1.1 to increase volume 4 times.

 

[miketsp]

Try this one:
A man is sitting in the middle of a lake in a boat and he throws a brick, weighing 1 kg, out of the boat into the lake.
What happens to the water level in the lake compared to the shore?

He then throws a block of ice weighing 1kg into the water.
What happens to the water level in the lake compared to the shore?

The ice then melts.
What happens to the water level in the lake compared to the shore?

 

[cmalinowski]

Try this one:
A man is sitting in the middle of a lake in a boat and he throws a brick, weighing 1 kg, out of the boat into the lake.
What happens to the water level in the lake compared to the shore?

He then throws a block of ice weighing 1kg into the water.
What happens to the water level in the lake compared to the shore?

The ice then melts.
What happens to the water level in the lake compared to the shore?

Nothing happens as the displacement of the water has already been taken into account on the boat. Moving the brick or the ice from the boat to the water should do nothing...

 

[pete340]

Nothing happens as the displacement of the water has already been taken into account on the boat. Moving the brick or the ice from the boat to the water should do nothing...

The boat displaces a volume of water whose weight is equal to the weight of the brick. Assuming the brick is more dense than water (i.e. it sinks), it displaces less water than than the boat did, and the water level of the lake goes down. And since ice is less dense than water (i.e. it floats), it goes the other way. But as a practical matter your answer is right: you won't be able to measure either difference.

Edit: whoops, too hasty. The ice floats in both places, so it doesn't affect the water level. And when it melts nothing changes.