In general, sound travels fastest through:

A 50-kg swimmer dives horizontally from a 200-kg raft with a speed of 2.0 m/s. The raft is initially at rest. What is the speed of the raft immediately after the diver jumps?

A rubber ball and a lump of putty have equal mass and strike a wall with equal speed. The ball bounces back with nearly the same speed, while the putty sticks. Which experiences the greater momentum change?

A light object and a heavy object slide with equal speeds on a level frictionless surface and then move up the same frictionless hill. Which rises to the greater height?

Two students leap from the same height above a lake. One jumps straight out horizontally, and the other simply steps off with no horizontal speed. Neglect air resistance. Compare the times to reach the water.

A ball is thrown straight upward. What is its acceleration at the highest point?

If you push twice as hard against a stationary brick wall, the amount of work you do on the wall:

Before YARN was added to Hadoop, we had to start the …………………………….. and the TaskTracker daemons to allow jobs to run in the cluster.

Your MapReduce application will use zero reducers if you skip setting the Reducer class in the Driver.

Although the default replication factor in HDFS is _______ , you should change it to _______ if you run Hadoop in the pseudo-distributed mode (the operation mode used in our VM).