An elevator is being lifted up an elevator shaft at a constant speed by a steel cable. All frictional effects are negligible. In this situation, forces on the elevator are such that

When you extended a spring by 0.2 m, it exerts a restoring force of 10 N. If you extend it by 0.4 m, how much restoring for will it exert?

You dropped a book in air. Which free-body diagram best represents the forces acting on the book as it falls? Picture6-2.jpg  

Suppose you observed that people tend to purchase stocks which have been on the rise and sell stocks which have sudden price drops. Anecdotal evidence suggests that stocks which have the higher returns in the past 3 months tend to perform better (namely, have higher returns in the following month) than those which have the lower  returns in the past 3 months do.   Define a factor Pi, t at time t as the past 3-month return of stock i from 3 month ago to present time t. Please describe a statistical analysis procedure to test whether the factor Pi, t is statistically significant in influencing the monthly asset returns at time t across ALL stocks. Describe a sorting procedure (as discussed in the lecture) to test whether a profitable portfolio strategy (equal-weight in each stock of the portfolio) can be formed based on the factor Pi, t with monthly re-balancing of the portfolio.

When summarizing the main points immediately before the conclusions and recommendations, review for the reader by using different wording than was used to present the data.

The amount of space you devote to an idea will emphasize or subordinate it.

When a report feels unified and reads smoothly, it has what?

Distortion by omission occurs when you:

Reports may be primarily text or a mix of text and graphics.

You should consider using a buffer statement when writing a message that rejects a proposal from an employee.