Physics, 10.11.2019 04:31 harleyloveless2853
Three identical boxcars are coupled together and are moving at a constant speed of 28.0 on a level, frictionless track. they collide with another identical boxcar that is initially at rest and couple to it, so that the four cars roll on as a unit. friction is small enough to be neglected. part awhat is the speed of the four cars? part bwhat percentage of the kinetic energy of the boxcars is dissipated in the collision? part cwhat happened to this energy?
Answers: 3
Physics, 22.06.2019 04:30
Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.
Answers: 3
Physics, 22.06.2019 05:30
Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp
Answers: 2
Physics, 22.06.2019 19:30
A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.
Answers: 1
Three identical boxcars are coupled together and are moving at a constant speed of 28.0 on a level,...
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