Biology; Chemistry; Physics: Post your doubts here!

[Awesome12]

Help in Q 32. the ans is D

1) Use the formula
Power = Voltage * Current
Find the current. Which ever option has a calculated current greater than the given current (fuse) that will blow up

2) Total resistance = 12000
Find current using V=IR
Current = 6/12000
Mutiply the current found by 10000 to find the value of V

 

[Lilly2318]

another mind-BLOWING question hahah
explain somebody View attachment 42794

A?

 

[Suhaib]

12 13 14 anyone explain this

 

[Lilly2318]

12 13 14 anyone explain this

12 A cuz its gives diif ans. use P1V1

 

[Lilly2318]

12 13 14 anyone explain this

is 13 B?

 

[Awesome12]

is 13 B?

No it is A. When he strikes the water, he will slow down and the friction will produce heat

 

[Lilly2318]

12 13 14 anyone explain this

14 is answer D?

 

[kirann]

Is the answer D?They act in different directions so no matter where they act,it can never add up and be greater than 50.

i answered D too but its A

 

[kirann]

A?

YEAH

 

[Lilly2318]

YEAH

cuz 10 cant be ans after subtarcting

 

[Suhaib]

is 13 B?

13 C

 

[Suhaib]

14 is answer D?

14 C

 

[Suhaib]

12 A cuz its gives diif ans. use P1V1

Still not cleared..

 

[Lilly2318]

multiply the coresponding values. se which ans differs

Still not cleared..

 

[Lilly2318]

I cant get 13 plz someone help

 

[Lilly2318]

13 C

I cant get 13 plz someone help

 

[exploded diper]

his speed was fast at the start so he had kinetic energy ...and as he dived in the pool he had potential energy .....and at the end due to frction and stuff all of tht was turned into heat....

 

[Suhaib]

his speed was fast at the start so he had kinetic energy ...and as he dived in the pool he had potential energy .....and at the end due to frction and stuff all of tht was turned into heat....

Can u explain 14 ?

 

[FLRNAB]

Can u explain 14 ?

Total Mass of lorry while going up is it's own mass and the mass of sand which is 10000 + 5000 = 15000kg
Lorry goes up with sand so it gains P.E p1 (mass 15000 kg).
Lorry dumps the sand so loses 5000 kg and returns to the bottom so it has lost P.E p2 of it's own mass (10000 kg).

So P.E gain is p1 - p2

Maths:
(15000 * 50 * 10) - (10000 * 50 * 10) = 2500000 J

 

[Suhaib]

Total Mass of lorry while going up is it's own mass and the mass of sand which is 10000 + 5000 = 15000kg
Lorry goes up with sand so it gains P.E p1 (mass 15000 kg).
Lorry dumps the sand so loses 5000 kg and returns to the bottom so it has lost P.E p2 of it's own mass (10000 kg).

So P.E gain is p1 - p2

Maths:
(15000 * 50 * 10) - (10000 * 50 * 10) = 2500000 J

Thanks