Download Homework Assignment 7: Name: Due beginning of class Show all

Homework Assignment 7:
Due beginning of class
Name:
Show all work for complete credit.
• Unless specified otherwise, round your answers to a reasonable number of
significant figures. (Rules are given in chapter 1 or round to 2-3 figures.)
• Give very large or very small values in scientific notation.
#1. (Underline or highlight the question.)
A 150 gram stone is tied to a string (length = 0.950 meters) and whirled in a circle at the same constant
speed. The speed of the stone is such that it does one revolution in 0.45 sec. For part a, the circle is
horizontal and the string is nearly parallel to the ground. For parts b and c, the circle is vertical. In each
case, find the tension in the string.
Plan:
Show your work:
Draw a Free-Body Diagram for each case. In each case, the view is so that the circle can
be seen.
a) Horizontal circle viewed b) Vertical circle when the c) Vertical circle when the
from above.
stone is at the top. The
stone is at the bottom. The
view is from the side.
view is from the side.
Write Newton’s 2nd Law equation for the radial direction for each case.
a) Horizontal circle
b) Vertical circle, top
c) Vertical circle, bottom
Solve for the Tension in the rope in each case.
a) Horizontal circle
b) Vertical circle, top
Phy 101: HW7: Fall 07
Eyres
c) Vertical circle, bottom
Homework Assignment 7:
Due beginning of class
Name:
Evaluate:
#2. Chapter 8: Problem #7 (Underline
or highlight the question.)
The arm in Figure P8.7 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the r
tension force Ft in the deltoid muscle and the r
force Fs exerted by the shoulder on the humerus (upper‐arm bone) to hold the arm in the position shown. Plan:
Show your work:
Answer the question: Be sure to include units.
Evaluate:
Do a unit analysis (if you didn’t do one above).
Is the magnitude of the answer reasonable? Is it the same as you calculated following
the other plan?.
Phy 101: HW7: Fall 07
Eyres