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As physics p1 MCQS YEARLY ONLY.

Thought blocker

Thought blocker

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Adira Luis said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf

Q) 17,19,20 anyone??
Click to expand...
17)
Speed = 10 m/s :
0.5 * m * 100 = 1500
m = 30 kg

Speed = 40 m/s :
0.5 * 30 * 1600 = 24000 J

19)
All you have to do is put in numbers into the formulas I've given you. You're given the pressure, which is F/A. They want you to find the density. Density=m/v. To get m, you'll need to divide F/g (g is a constant). To get V, you'll need to multiply A with the height, which is given in the question.

20)
here
 
H

Hanona

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Hanona

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Thought blocker said:
17)
Speed = 10 m/s :
0.5 * m * 100 = 1500
m = 30 kg

Speed = 40 m/s :
0.5 * 30 * 1600 = 24000 J

19)
All you have to do is put in numbers into the formulas I've given you. You're given the pressure, which is F/A. They want you to find the density. Density=m/v. To get m, you'll need to divide F/g (g is a constant). To get V, you'll need to multiply A with the height, which is given in the question.

20)
here
Click to expand...


hahaha lol i was a minute late !
 
A

Ahmed Aqdam

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Catherine7532 said:
can u explain me q35 and q17????
Click to expand...
Q17: The gravitational potential energy is taken from the bottom of the ball. The diameter of the ball is 8.0 cm so height taken before is 72 cm and taken after is 37 cm. The ratio of kinetic energy transformed is the same as the gravitational potential energy transformed. So 37/72*0.75=0.39

Q35: The resistance of the first part is 1/(1/1000+1/1000), then +1000 and then 1(1/1500+1/1000)=600 ohm
The resistance of the second part is 1(1/3000+1/1000)=750, then 1/(1/750+1/1000)=3000/7 ohm
p.d. through first part is (600/(600+3000/7))*3=1.75V
p.d. through second part is (3000/7/(3000/7+600))*3=1.25V

Their difference is 0.5V so that is the reading.
Catherine7532 said:
and even q23
Click to expand...
A: Force is 2N and spring constant,k is 1/2 in series combination. Extension is 2/(1/2)=4
B: Force is 1N and k is 1/3. Extension is 1/(1/3)=3
C: Force is 6N and k is 2 in parallel combination. Extension is 6/2=3
D: Force is 8N and k is 3. Extension is 8/3=2.7

So the greatest extension is in A.
 
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Hanona

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Exo_luhan said:
the answer is B!!!CAN NE1 EXPLAIN WHY?
Click to expand...
the volume is 340 m^3 per minute .. so the mass is = density x volume = 340 x 1000 = 340000
you need to calculate power to determine the power out so power = work done / time
work done is equivilant to the gain in potential energy which is mgh = 340000 x 9.81 x 30 =100062000
power = 100062000/ 60 ( because its per minute you need to convert it to seconds = 1667700
now to find the power out you multiply by the efficiency = 1500930= 1.5 MW
 
Hadi Murtaza

Hadi Murtaza

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Hanona said:
Thought blocker please explain this to us~ i understand it but i need further explaination! :)
Click to expand...
Exo_luhan said:
whayo the answer D?
Click to expand...
Across da 2Ω resistor, da Potential decreases a little so gradient will b relatively small for da first part. den between da 2 resistors potential is constant so straight line. now for da 4Ω resistor, da potential decreases more den it did across da 2Ω, so gradient will b steeper den across 2Ω. Answer therefore is D
 
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