Physics, 28.02.2021 14:10, trevorhenyan51
Two cars start moving from the same point on a rectilinear path at the same time, heading to the same destination 90 km away. The first travels at an average speed of 50 km/h and the second at 60 km/h. Deter- mine the time interval separating the arrival of the two cars to their destination.
Answers: 1
Physics, 22.06.2019 09:00, cmflores3245
Sobre transformaçÔes cĂclicas, sĂŁo feitas algumas afirmaçÔes, determine quais estĂŁo corretas. i â a variação de energia interna em uma transformação cĂclica Ă© nula; ii â o trabalho, em uma transformação cĂclica, Ă© sempre positivo; iii â ao completar um ciclo, o gĂĄs tem a mesma temperatura com a qual começou a transformação; iv â uma transformação cĂclica Ă©, obrigatoriamente, composta de transformaçÔes conhecidas, como adiabĂĄtica, isocĂłrica, etc: a) i e iii b) i e ii c) ii e iii d) i e iv e) iii e iv
Answers: 1
Physics, 22.06.2019 10:50, afonseca73
Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.
Answers: 3
Physics, 22.06.2019 17:00, agelafa
Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control roomâs ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronautâs hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?
Answers: 1
Two cars start moving from the same point on a rectilinear path at the same time, heading to the sam...
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20
Mathematics, 09.11.2020 22:20