Am un telefon SAMSUNG GALAXY J6 2018 si nu stiu din ce motiv ecranul este complet negru...
Cand il bag la incarcat vibreaza dar nu se aprinde
Pot raspunde la apeluri video cu ușurință apasând pe ecranul negru..
Ma poate ajuta cineva???

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines