What is the tension (in N) in the lifting cable when the submarine is submerged in water of density 1000 kg/m3

In the figure, a ball hangs by a very light string. What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A, which is 1.0 m above the bottom of the swing?  

A water thermometer is used to measure the temperature and on a particular hot day, it registered a change in temperature of 100°F. What change in temperature does this correspond to on the Kelvin Scale?   (Note: T(°F) = ( T(°C) × 9/5 ) + 32

The following two questions refer to this situation:   A green ball of mass 200 grams and a red ball of mass 400 grams are pushed horizontally from a table of height 3 meters. Green ball has a velocity of 10 m/s and red ball has a velocity of 15 m/s as they leave the edge of the table (Ignore air resistance).

Which of the following is a vector quantity?

The next two questions are related to the following situation A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg.  

You are walking out on a frozen lake and you begin to hear the ice cracking beneath you.  What is your best strategy for getting off the ice safely?

What is the work done (in J) by the shopper as she moves down a 58.0-m length aisle.

Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)

What is the net work done (in J) on the cart?