Author Question: A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts ... (Read 229 times)

ec501234 · **on:** Jul 29, 2018

A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K.

If the same pull instead acts over twice this distance: A) The sled's speed will be 2v and its kinetic energy will be 2K.
B) The sled's speed will be 2v and its kinetic energy will be K .
C) The sled's speed will be v and its kinetic energy will be 2K.
D) The sled's speed will be v and its kinetic energy will be K .
E) The sled's speed will be 4v and its kinetic energy will be 2K.

Question 2

A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3.

A) 24 N B) 40 N C) 20 N D) 2.5 N E) 34 N