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Physics: Post your doubts here!
m1g is weight at one side. m2g is weight at other side. their difference is balanced by motor. so the resultant force is m1g - m2g = g(m1-m2) motor provide the same amount of force to keep the resultant = o power = Fv = g(m1-m2)*v- Suchal Riaz
- Post #10,803
- Forum: A-Levels
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Physics: Post your doubts here!
if he is at constant speed there is no resultant force so all forces cancel out so air resistance = weight kv=mg v=mg/k kinetic energy = 1/2 mv² = 1/2 m (mg/k)² = 1/2 m³g²/k² = m³g²/2k²- Suchal Riaz
- Post #10,800
- Forum: A-Levels
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Physics: Post your doubts here!
he is moving up at rate of 50cm/s means 0.5m/s his mass is 80KG so his weight is almost 785N power = work done per second= Force * distance/second = 785*0.5=392=0.39KW- Suchal Riaz
- Post #10,799
- Forum: A-Levels
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Physics: Post your doubts here!
density = mass/volume ρ=m/V mass = ρV ---- both masses are same. the second liquid has twice density. so for mass to be same the volume must be half. total volume = 1.5 times initial volume. final mass = twice the initial mass. final ρ = 2m/1.5V = 4/3 ( m/V) = 4/3 ρ- Suchal Riaz
- Post #10,798
- Forum: A-Levels
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Physics: Post your doubts here!
there are a series of formulae to apply in this one. you must make sense first. current = rate of flow of CHARGE I = Q/t charge of electron is e = 1.6E-19 (Q/t )/Q=1/t if we divide I(total charge per time) by charge of one single electron we get number of electrons. and the direction of current...- Suchal Riaz
- Post #10,797
- Forum: A-Levels
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Chemistry: Post your doubts here!
enthalpy change of combustion means COMPLETE combustion. Carbon can form two products when burning: CO2 or CO. enthalpy change of combustion of C is same as enthalpy change of formation of CO2 but not same as enthalpy change of formation of CO- Suchal Riaz
- Post #9,745
- Forum: A-Levels
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Chemistry: Post your doubts here!
enthalpy change of combustion of lead means complete oxidation. until it oxidises to Pb3O4. that is same as formation of Pb3O4 not of PbO- Suchal Riaz
- Post #9,744
- Forum: A-Levels
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Chemistry: Post your doubts here!
H3 + means three hydrogen bonded to each other with a positive charge. so it has three protons. no neutrons. and 2 electrons are there is a positive charge on it. L + is one lithium ion with one lithium-6 which has lost one electron. lithium has 3 protons. 6-3=3 neutrons. and has lost one...- Suchal Riaz
- Post #9,743
- Forum: A-Levels
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Chemistry: Post your doubts here!
- Suchal Riaz
- Post #9,741
- Forum: A-Levels
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Chemistry: Post your doubts here!
i didn't read that part. sorry. i was watching pokemon :P trying to resurrect my sad old memories :'(- Suchal Riaz
- Post #9,738
- Forum: A-Levels
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Chemistry: Post your doubts here!
it has a chiral carbon. so think of a single center carbon with one H attached on OH attached and two other groups attached. to make it chiral these two must be difficult. to make n smallest one must be CH3 and other must be C2H5- Suchal Riaz
- Post #9,733
- Forum: A-Levels
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definition in dictionary procrastination prə(ʊ)ˌkrastɪˈneɪʃ(ə)n noun the action of delaying or...
definition in dictionary procrastination prə(ʊ)ˌkrastɪˈneɪʃ(ə)n noun the action of delaying or postponing something.- Suchal Riaz
- Profile post comment
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Physics: Post your doubts here!
what exactly is your question maybe I can help. rate of flow of charged particle(such as electrons) is current I=Q/t- Suchal Riaz
- Post #10,786
- Forum: A-Levels
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From today I will again start helping you guys out. :P
From today I will again start helping you guys out. :P- Suchal Riaz
- Profile post
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Physics: Post your doubts here!
If anyone has any problem ask me tag me 'suchal riaz' or text me if i am not available.- Suchal Riaz
- Post #10,784
- Forum: A-Levels
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Chemistry: Post your doubts here!
If anyone has any problem ask me tag me 'suchal riaz' or text me if i am not available.- Suchal Riaz
- Post #9,731
- Forum: A-Levels
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