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As physics p1 MCQS YEARLY ONLY.
18) v^2=u^2+2gs g=-9.81 (since car is moving upwards and gravity act downwards) v^2=28^2+(2*(-9.81)*22) v^2=352.36 v=18.77= 19 ms^-1- Thought blocker
- Post #997
- Forum: A-Levels
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I might leave you all guys after 4 days... for 2 years.
I might leave you all guys after 4 days... for 2 years.- Thought blocker
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I am repeating my As level.
14) By conservation of momentum, 2 x 2 = 1 x v, v =4 so the 1kg trolley moves 4ms-1 to the right, calculating the total KE of the both trolleys, which is 1/2 x 2 x 2^2 + 1/2 x 1 x 4^2 = 12J assuming no energy is lost, the energy stored in the spring is converted to KE gained by the trolleys, so...- Thought blocker
- Post #91
- Forum: A-Levels
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Physics: Post your doubts here!
17) At the bottom height is zero so mgh = zero now going upwards.. 2 block has height = 1 so mg1h 3 block = mg2h 4 block = mg3h Sum up P.E ans is 6mgh 18) efficiency = output power/input power in this case its a generator so output power is P=VI = 230 x 32=7360 input power = E(potential) / time...- Thought blocker
- Post #10,777
- Forum: A-Levels
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Physics: Post your doubts here!
5) x is 0.44. Add uncertainties. U get 0.03. (0.03/0.44)*100 = 7% 11) The tension in the rope needs to balance out the weight of the student acting downwards, so since the total tension needs to be opposite and equal to the weight, Let tension in rope on left side be T1 and the tension on rope...- Thought blocker
- Post #10,775
- Forum: A-Levels
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Physics: Post your doubts here!
28) Weight acts downwards so since it's in equilibrium the electric force has to act upwards. Since the plate up is positive and attracting the drop, that drop has to have a negative charge.- Thought blocker
- Post #10,774
- Forum: A-Levels
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I am repeating my As level.
9) force=rate of change of momentum 60=-(30v-30*3)/0.5 (i put a minus sign before the bracket because the force is a retarding force, so the acceleration will be negative) v= 2 13) assuming it is projected with velocity v, so the initial KE, E= (mv^2)/2 at the highest point, the vertical...- Thought blocker
- Post #87
- Forum: A-Levels
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Physics: Post your doubts here!
14,15,21, and 31!! 14) Moment = force times distance from the pivote ----------> F * 2R happens in B 15) ( 10cos30 + 10cos30 ) - 10 = 7.3 21) 17.5 *10^6 = 830*g*h + 1000*g*h 17.5 * 10^6 = 8142.3x + 9810(2000 - x) 17.5 *10^6 = 8142.3x + 19 620 000 - 9810x -2 120 000= -1667.7x 1271.2 = x ~ 1270...- Thought blocker
- Post #10,770
- Forum: A-Levels
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Physics: Post your doubts here!
14) (0.35*3*9.81)+(0.1*1.4*9.81=(0.15*6*9.81)+ans ans=2.8Nm 16) 80*28/100=112/5 112/5 =potential energy 112/5=mgh 112/5=(o.12)(9.81)h P.Sonly 120 g taken into account as only the arrow has a movement. 17) mgsinteta*speed=40% of total power mgsinteta=force force*velocity=power (total...- Thought blocker
- Post #10,768
- Forum: A-Levels
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Physics: Post your doubts here!
20) Take the leftmost column of liquid. There is a rule in fluid-statics that "the pressure in a sample of liquid is the same at any vertical height, as long as the fluid at that height is part of the whole." What that says is that in any single sample of liquid, the pressure at any height is...- Thought blocker
- Post #10,767
- Forum: A-Levels
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Physics: Post your doubts here!
At point S and P both have highest acceleration :) and Q wont be zero all the time as it is oscillating.- Thought blocker
- Post #10,766
- Forum: A-Levels
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Suggestions accepted. *Only if ghost likes it* :P
Suggestions accepted. *Only if ghost likes it* :P- Thought blocker
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As physics p1 MCQS YEARLY ONLY.
-Phew- Any doubts left O.o ?- Thought blocker
- Post #992
- Forum: A-Levels
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