Physics, 20.03.2020 11:13 lilchannelll4125
Ablock of mass m is projected straight upward by a strong spring whose stiffness is ks. when the block is a height y1 above the floor, it is traveling upward at speed v1, and the spring is compressed an amount s1. a short time later the block is at height y2, traveling upward at speed v2, and the spring is compressed an amount s2. in this discussion we'll use the energy principle in the form ef = ei + wext, where we assume that thermal transfer of energy (microscopic work) q between the block and the air is negligible. we can ignore the rest energies which don't change, and the kinetic energy of the earth, which hardly changes. i. system: universe (block + spring + earth) for the system consisting of the block, the spring, and the earth, which of the following equations correctly represents the energy principle in the form ef = ei + wext? (1/2)mv22 - (1/2)kss22 = (1/2)mv12 - (1/2)kss12 - mg(y2-y1)(1/2)mv22 + (1/2)kss22 = (1/2)mv12 + (1/2)kss12 - mg(y2-y1)(1/2)mv22 - mgy2 + (1/2)kss22 = (1/2)mv12 - mgy1 + (1/2)kss12(1/2)mv22 = (1/2)mv12 - (1/2)ks(s22 - s12) - mg(y2-y1)(1/2)mv22 = (1/2)mv12 + (1/2)ks(s22 - s12) + mg(y2-y1)(1/2)mv22 + mgy2 + (1/2)kss22 = (1/2)mv12 + mgy1 + (1/2)kss12
Answers: 2
Physics, 21.06.2019 23:30, schapethan
In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce
Answers: 1
Physics, 22.06.2019 03:30, itsRyanPlayzMC9660
Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.
Answers: 1
Physics, 22.06.2019 05:30, robert7248
What do you think car designers do if the damage caused by a crash test is too severe?
Answers: 1
Ablock of mass m is projected straight upward by a strong spring whose stiffness is ks. when the blo...
English, 19.06.2020 21:57
Mathematics, 19.06.2020 21:57
Mathematics, 19.06.2020 21:57