Physics, 08.05.2021 14:00 dpazmembreno

What must the emf ε in the figure in order for the current through the 4.00-Ω resistor to be 2.50 A? Each emf source has negligible internal resistance

What must the emf ε in the figure in order for the current through the 4.00-Ω resistor to be 2.50 A

Answers: 3

Show answers

Another question on Physics

Physics, 21.06.2019 22:00

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

Answers: 1

Answer

Physics, 22.06.2019 04:30

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

Answers: 2

Answer

Physics, 22.06.2019 10:00

Which type of basaltic lava flow has a fairly smooth

Answers: 2

Answer

Physics, 22.06.2019 16:40

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Answers: 3

Answer

You know the right answer?

What must the emf ε in the figure in order for the current through the 4.00-Ω resistor to be 2.50 A?...

Questions