Physics, 14.01.2020 07:31, buddyshaw76
Suppose you are reshelving books in a library. as you lift a book from the floor and place it on the top shelf, two forces act on the book: your upward lifting force and the downward gravity force. is the mechanical work done by your lifting force positive, negative, or zero? is the work done by the gravity force positive, zero or negative? is the sum of the works done by both forces positive, negative or zero?
Answers: 1
Physics, 22.06.2019 06:00, jagmeetcheema
The frequency of vibrations of a vibrating violin string is given by f = 1 2l t Ď where l is the length of the string, t is its tension, and Ď is its linear density.â (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and Ď are constant) (ii) the tension (when l and Ď are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is â f is â (ii) when the tension is increased by turning a tuning peg df dt 0 and t is â f is â (iii) when the linear density is increased by switching to another string df dĎ 0 and Ď is â f is â
Answers: 3
Physics, 22.06.2019 11:50, taylorannsalazar
Select all that applywhat are some basic resources a family is expected to provide for children? educationclothesspending
Answers: 2
Physics, 22.06.2019 16:30, makennahudson94
In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendelâs discoveries in genetics. over a century later, darwinâs idea of evolution was modified in order to incorporate mendelâs rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendelâs rules of genetics and darwinâs idea of biological evolution? a.)mendelâs genetics states laws that are now part of the theory of biological evolution. b.)biological evolution states laws that are part of mendelâs theory of genetics. c.)mendelâs genetics replaced darwinâs entire concept of biological evolution. d.)biological evolution is a law that explains why all genetics exist.
Answers: 1
Physics, 22.06.2019 17:00, WorkingButNotReally
If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction
Answers: 3
Suppose you are reshelving books in a library. as you lift a book from the floor and place it on the...
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