ALL PHYSICS DOUBTS - POST HERE !!

[6394]

k jus wanna mak sure abt somthing
induction opp poles are formed like attachmnt!!
n strkin same poles r formd ryt!!!!!!
?

[Shazizzzle]

145         0           145
      A  ->   beta +       Z
92          -1            93

Answer is D, oui ou non?

Non, They say answer is B!
And I get it now. See A@di's post.

[Ivo]

k jus wanna mak sure abt somthing
induction opp poles are formed like attachmnt!!
n strkin same poles r formd ryt!!!!!!
?

I think induction always causes attraction.

[Shazizzzle]

In beta decay, the weak interaction converts a neutron (n) into a proton (p) while emitting an electron (e^-)

First) 38)m/j06. As the above states, the electron comes from the neutron, the neutron is in the nucleus.

Second) When a beta particle is emitted, The mass remains the same, because a neturon is replaced by a proton, the no. of neutrons decrease , no. of proton increases.

OH! Okay! Thanks!
I Can't believe we weren't told this!
+rep

[Dana]

Hey guys... slip ring commutators split rings and brushes.. :S wht r they and wht r they present in? Thxs in advance..

Slip rings are in generators they remove the current produced. the brushes hold them in place i think and are attached to the coils/wires where the voltmeter/ammeters are. Look in your book I'm sure there's a drawing there for a genrator.
Split ring commutators are in motors and are there to ensure that the motor continues to spin.
Hope I helped!

[Ghost Of Highbury]

OH! Okay! Thanks!
I Can't believe we weren't told this!
+rep

Anytime.

[Dana]

A 2 kg mass of copper is heated for 40 s by a heater that produces 100 J / s.
The specific heat capacity of copper is 400 J / (kg K).
What is the rise in temperature?
A 5K
B 10K
C 20K
D 50K

Help? 

[Ivo]

145         0           145
      A  ->   beta +       Z
92          -1            93

Answer is D, oui ou non?

So is this now right?

237         0           237
      A  ->   beta +       Z
92          -1            93

So is it B then because 237-93 is 144, which is no of neutrons.  And protons is 93?  Can we think of it this way?

[Vin]

145         0           145
      A  ->   beta +       Z
92          -1            93

Answer is D, oui ou non?

Je suis desole, ce n'est pas la reponse ! Even i thought the same way ! But turned out to be B

[Ivo]

A 2 kg mass of copper is heated for 40 s by a heater that produces 100 J / s.
The specific heat capacity of copper is 400 J / (kg K).
What is the rise in temperature?
A 5K
B 10K
C 20K
D 50K

Help? 

P=E/T so E=PT=100*40=4,000

E=mCT so T=E/mc = 4000/(2*400) = 5

A?

[Raywin]

Slip rings are in generators they remove the current produced. the brushes hold them in place i think and are attached to the coils/wires where the voltmeter/ammeters are. Look in your book I'm sure there's a drawing there for a genrator.
Split ring commutators are in motors and are there to ensure that the motor continues to spin.
Hope I helped!

Yep u did!! Thanks a lot!

[Vin]

So is this now right?

237         0           237
      A  ->   beta +       Z
92          -1            93

So is it B then because 237-93 is 144, which is no of neutrons.  And protons is 93?  Can we think of it this way?

yes i think so ..  

[holtadit]

What are logic gates made from

[WARRIOR]

a women tune her radio to a station broadcasting on 200m

what does 200m tell her about the radio wave?

freq

wave leng

sped

ampl

[Shazizzzle]

What are logic gates made from

Silicon, or germanium.