Tricky riddles

What kind of dog has a bark but no bite?

Can a man legally marry his widow's sister in the state of California?

There is bomb on top of a computer; around the computer are a hairbrush, keys, phone and a cup. When the explosion comes, what item destroyed first?

Imagine you are in a sinking rowboat surrounded by sharks. How would you survive?

If it takes one man three days to dig a hole, how long does it take two men to dig half a hole?

Romeo and Juliet are found dead on the floor in a bedroom. When they were discovered, there were pieces of glass and some water on the floor. The only furniture in the room is a shelf and a bed. The house is in a remote location, away from everything except for the nearby railroad track. What caused the death of Romeo and Juliet?

A boat has a ladder that has six rungs, each rung is one foot apart. The bottom rung is one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one hour. When the tide is at it's highest, how many rungs are under water?

What am I?

There was a plane crash every single person died. Who survived?

Hockey Stick and ball cost $50. If the Stick cost $49 more than the ball. What is the cost of each ?