Q- A cuboidal block of dimensions 3 X4 X5 cm has a mass of 10 g. The block is kept on the ground.
a) Find the minimum pressure that it exerts
on the ground.
b) Find the maximum pressure that the
block can exert on the ground.
Answers
Explanation:
p= m g h/ v
= 10×10^-3× 9.81× × 5×10-2/ 60 ×10^-6
=81.75 Nm^2
Answer:
LTEs always have been a feature of American newspapers. Much of the earliest news reports and commentaries published by early-American newspapers were delivered in the form of letters, and by the mid-18th century, LTEs were a dominant carrier of political and social discourse. Many influential essays about the role of government in matters such as personal freedoms and economic development took the form of letters — consider Cato's Letters or Letters from a Farmer in Pennsylvania, which were widely reprinted in early American newspapers. Through the 19th century, LTEs were increasingly centralized near the editorials of newspapers, so that by the turn of the 20th century LTEs had become permanent fixtures of the opinion pages.
Modern LTE forums differ little from those earlier counterparts. A typical forum will include a half-dozen to a dozen letters (or excerpts from letters). The letters chosen for publication usually are only a sample of the total letters submitted, with larger-circulation publications running a much smaller percentage of submissions and small-circulation publications running nearly all of the relatively few letters they receive. Editors generally read all submissions, but in general most will automatically reject letters that include profanity, libelous statements, personal attacks against individuals or specific organizations, that are unreasonably long (most publications suggest length limits ranging from 200 to 500 words) or that are submitted anonymously.
The latter criterion is a fairly recent development in LTE management. Prior to the Cold War paranoia of the mid-20th century, anonymous LTEs were common; in fact, the right to write anonymously was central to the free-press/free-speech movement (as in the 1735 trial against John Peter Zenger, which started with an anonymous essay). By the 1970s, editors had developed strong negative attitudes toward anonymous letters, and by the end of the 20th century, about 94 percent of newspapers automatically rejected anonymous LTEs. Some newspapers in the 1980s and 1990s created special anonymous opinion forums that allowed people to either record short verbal opinions via telephone (which were then transcribed and published) or send letters that were either unsigned or where the author used a pseudonym. Although many journalists derided the anonymous call-in forums as unethical (for instance, someone could make an unfounded opinion without worry of the consequences or having to back the comment up with hard facts), defenders argued that such forums upheld the free-press tradition of vigorous, uninhibited debate similar to that found in earlier newspapers.
Although primarily considered a function of print publications, LTEs also are present in electronic media. In broadcast journalism, LTEs have always been a semi-regular feature of 60 Minutes and the news programs of National Public Radio. LTEs also are widespread on the Internet in various forms.
By the early 21st century, the Internet had become a delivery system for many LTEs via e-mail and news websites (in fact, after several envelopes containing a powder suspected to be anthrax were mailed to lawmakers and journalists, several news organizations announced they would only accept e-mail LTEs). Because the Internet broadly expanded the potential readership of editorials and opinion columns at small newspapers, their controversial editorials or columns could sometimes attract much more e-mail than they were used to handling — so much so that a few newspapers had their e-mail servers crash.
Editors are a frequent target of letter-writing campaigns, also called "astroturfing," or "fake grass-roots" operations where sample letters are distributed on the Internet or otherwise, to be copied or rewritten and submitted as personal letters.[2][3]
Although LTE management gets little attention in trade journals, one organization, the National Conference of Editorial Writers, often includes essays on LTE management. o wrote, "Consider letters as a barometer of how well (you are) engaging readers or viewers. The more you receive, the more you're connecting. The fewer you receive, the stronger the sign that you're putting the masses to sleep."