subject
Physics, 22.06.2019 09:50 blaqsafire9291

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

ansver
Answers: 3

Another question on Physics

question
Physics, 21.06.2019 18:10
Ahypothetical metal crystallizes in simple cubic crystal structure having lattice parameter of 150 picometers. calculate the following. (a) magnitude(s) of the burgers vectors of edge dislocation and screw dislocation in this metal (b) write all possible independent burger’s vectors for dislocations in this metal (c) number of slip planes on which slip is most likely to occur (d) number of independent slip systems (e) do the slip systems intersect? if yes, along which family of crystallographic directions?
Answers: 1
question
Physics, 21.06.2019 20:20
Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?
Answers: 1
question
Physics, 21.06.2019 20:30
What property is a characteristic of a substance that can be observed and does not change the identity of the substance
Answers: 2
question
Physics, 21.06.2019 22:00
In the 1640s, the flemish chemist jan baptista van helmont performed the classic experiment paraphrased below: i filled a pot with 200 pounds of dirt that had been dried in an oven. then i planted the stem of a willow tree and watered it with rainwater. at the beginning, the willow stem weighed 5 pounds. for 5 years, i watered the tree with either rainwater or distilled water whenever it was needed. the pot was large, and planted in the ground. i covered the pot with an iron plate. this had many holes, which allowed water through but not dust. in this way, i could be assured that possible dust accumulation over these 5 years did not significantly add to the weight of the dirt. after 5 years, the tree weighed 169 pounds, and about 3 ounces. i did not take into account the weight of the leaves that fell each autumn. at length, i again dried the dirt, which weighed only 2 ounces less than the initial 200 pounds. i concluded that the 164 pounds of wood, bark, and roots, arose out of water only. in what way was van helmont's conclusion incorrect?
Answers: 1
You know the right answer?
If an athlete runs once around a track, back to the starting line, her average velocity is zero. tru...
Questions
question
Mathematics, 05.05.2020 10:37
question
Computers and Technology, 05.05.2020 10:37
question
Mathematics, 05.05.2020 10:37
Questions on the website: 11362056