subject
Physics, 07.09.2019 02:10 nathaliapachon1254

(a) how many electrons would have to be removed from a penny to leave it with a charge of +1.0×10−7 c? [4] (b) to what fraction of the electrons in the penny does this correspond? [6] [a penny has a mass of 3.11 g; assume it is made entirely of copper.]

ansver
Answers: 3

Other questions on the subject: Physics

image
Physics, 21.06.2019 22:30, djs1671
Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.
Answers: 3
image
Physics, 22.06.2019 01:30, romanlittlewood
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.
Answers: 3
image
Physics, 22.06.2019 05:30, guendyg04
Could someone me find the answer to this problem.
Answers: 1
image
Physics, 22.06.2019 10:00, mathscience9301
Which fact supports the conclusion that there will be fewer farm managers in the future? a) a farmer manager’s duties vary by the type of farm. b) farm technology is replacing some administrative jobs c) farm managers often need experience but not education. d) administrative duties include budgeting and training staff.
Answers: 2
You know the right answer?
(a) how many electrons would have to be removed from a penny to leave it with a charge of +1.0×10−7...

Questions in other subjects:

Konu
Physics, 11.11.2020 21:40
Konu
English, 11.11.2020 21:40
Konu
Mathematics, 11.11.2020 21:40