Physics, 29.02.2020 05:24 alexseyreyes
Three swimmers who all swim at the same speed discuss how to cross a river in the shortest amount of time. Swimmer AA will swim straight across the river at a right angle to the current. Swimmer BB reasons that the current will carry AA downstream, meaning that A will cover a greater distance to get across and therefore will take a longer time interval. BB says he will aim at an upstream angle such that, allowing for the current, he will reach the other side directly across from where he starts, thus covering the shortest distance and arriving first. Swimmer CC, reasoning that the time interval needed for BB to cross will be longer than BB expects because some of BB's effort will be spent battling the current, plans to aim at a downstream angle, so that the current assists rather than opposes him. This way he will be traveling at the highest speed and get across first.
Answers: 3
Physics, 21.06.2019 23:30, mmaglaya1
Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
Answers: 1
Physics, 22.06.2019 11:50, kelseybell2707
An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field
Answers: 3
Three swimmers who all swim at the same speed discuss how to cross a river in the shortest amount of...
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