Verifică-ti cunoştinţele Exersează
1. Transcrie enunturile de mai jos pe caiet şi completează spațiile punctate;
a) Corpurile care au proprietatea de a atrage corpuri usoare se află în starem
Corpurile neelectrizate sunt corpuri
b)... caracterizează gradul de electrizare a corpului.
c) Sarcina electrică a unui corp neutru este egală cu
d) în urma frecării cu o bucată de țesătură, tubul de plastic se u
e) Bastonașul de sticlă frecat cu o țesătură de mătase este încărcat cu sarcină
electrică
f) Sarcinile electrice de... se atrag, iar cele de... se resping,​

Which type of wave can travel without a medium

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly