All real materials deform under load. A measure of mechanical stiffness is 5 points Young's Modulus of Elasticity. Young's Modulus (E) is defined as the ratio
of stress to strain, where stress is defined as Force/Area, and strain is
defined as the ratio of the length change/original length. If this is the case,
what are the dimensions you'd expect to see for E?
A. M L^-1 T^-2
B. M L T
C. M L^-3 T^-2
D. M L^-1 T^-3

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Which are causes of mechanical weathering? (check all that apply) a. acid rain b. plant growth c. animal actions d. carbon dioxide e. pressure release i chose b & e and got the question wrong.

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?