Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Ivo:
--- Quote from: pglasg74 on May 25, 2010, 11:25:53 pm ---
vin can u explain.. i dont understand questions like #20 in summer 07.. like i dont get it, isnt wavelength supposed to decrease when they enter deeper, why are they further apart? why is the answer c not b :S:S:S:S
and i posted the fuse question before..
--- End quote ---
If you look at the question, it says from shallow to deeper water, so they travel quickly don't they, the waves when they enter the deeper water.
Must be C because, lambda=v/f so if speed increases, frequency is constant (same colour), so wavelength increases, so lines are further apart.
Got it? ;D
High-R:
--- Quote from: hamz on May 25, 2010, 10:14:58 pm ---hey ppl wats gravitational ENERGY?
i got this question of the stone being thrown upwards and comes down.....and it asks where is the gravitational energy the least....so the answer is: tht the gravitationalenergy is least when the stone is just about to touch the ground!!!
can anyone explain y?...and how..wats this Gr.Energy?
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plz reply!!!...HURRY!!!!!!!!!
pglasg74:
--- Quote from: Ivo on May 25, 2010, 11:31:19 pm ---If you look at the question, it says from shallow to deeper water, so they travel quickly don't they, the waves when they enter the deeper water.
Must be C because, lambda=v/f so if speed increases, frequency is constant (same colour), so wavelength increases, so lines are further apart.
Got it? ;D
--- End quote ---
no the answer says which diagram shows the waves in the DEEPER region..
pglasg74:
--- Quote from: Syed Kazim on May 25, 2010, 11:21:45 pm ---In Beta decay a neutron changes to a proton and an electron. The proton remains in the nucleus and the electron is emitted as a beta-particle. The new nucleus has the same nucleon number, but its proton number increases by one since it has one more proton.
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thanks, now can u answer "A mains current can safely supply a current of 40 A. A hairdryer takes 2A. It is connected to the circuit by a lead which can safely carry up to 5 A.
Which fuse is best to use in the plug fitted to the hairdryer lead?"
1 A, 3 A, 50 A OR 10 A?
and pls explain how to select the best fuse..
Ivo:
--- Quote from: hamz on May 25, 2010, 11:33:11 pm ---plz reply!!!...HURRY!!!!!!!!!
--- End quote ---
GPE: energy due to position.
KE: energy due to motion.
So at start, GPE is greatest (no motion). When thrown up (GPE converted to KE) then momentarily stops at top of flightpath (GPE again) then when it drops (GPE to KE increases), so just before it hits, KE is greatest, therefore a lot of GPE has been converted, therefore GPE is least. Got it? ;D
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