PHY101 : General Physics : Spring 2023
Prof. Bob Ekey 
Bracy Science Center - RM 111
Phone - 330/823-3657
Email - ekeyrc@mountunion.edu

----------------Homework #9----------------
Due: 4:00 PM, Tuesday, March 28, 2023
Online Work submitted on Mastering Physics
Written Work submitted digitally on D2L
--------------------------------------------

---------- MasteringPhysics (online)----------

Assigned questions from Chapter 9 and 10 to be completed online.
http://www.masteringphysics.com/

9.CQ8, 10.Cq4, 10.5, 10.8, 10.13, 10.19, 10.25

Note: Tutorials are included for practice, but are not required.

---------- Written (book or Ekey) ----------

Assigned questions from Chapter 9, pages 227-230

9.10, 9.29, 9.55

Assigned questions from Chapter 10, pages 255-260

10.cq8, 10.23, 10.46  


CQ = Conceptual Question
#s are exercises and problems

Additional Question A

You are driving at 35 km/hr when the road suddenly descends 15 m into a valley.  You take your foot off the accelerator and coast down the hill.  Just as you reach the bottom you see the police officer hiding behind the speed limit sign that reads 70 km/h. Are you going to get a speeding ticket?


Additional Question B

On a TV survival show, the only food the hungry contestants can see is fruit hanging on a branch high in a tree. Fortunately, they have a spring they can use to launch a rock. The spring constant is 1000 N/m and they can compress the spring a maximum distance of 30 cm.  All rocks on the island have a mass of 400 g for some mysterious reason.

(a) With what speed does the rock leave the spring?
(b) If the fruit hangs 15 m above the ground, will they feast or go hungry?