IIT JEE , AIEEE Forum - Physics , Mechanics - Simple assertion-reason....

Shesha

kinda contrary to the conservation of energy don't you think?

sushma12

For the first one,

let the box be the lift

when a person sitting in the lift projects a stone with some angle THETA then definately it fallows a parabolic path because the person are in same frame.So assertion is false.

computer001

2)
assertioon is false
water has max volume-(density not volume) @ 4 degree
so heating/cooling volume will decrease-(increase)
edited

karthik2007

@sesha - the initial energy is provided by the man... and that energy doesn't get dissipated.

Shesha

i agree... i think it's going to be parabolic..

assertion must be false

junglejalebi

heuyyyyyyyyyyyyyyyyyyyyyyyyy
u copmuter

water has minimum at 4 not maximum

Ronaldooo

Yes,water should have minimum volume at 4⁰C as density is max at that tep..Am i correct??

junglejalebi

that is what i m saying see above

Shesha

Water exhibits an anomalous behavour; it

contracts on heating between 0 °C and 4 °C.

The volume of a given amount of water decreases

as it is cooled from room temperature, until its

temperature reaches 4 °C. Below

4 °C, the volume increases, and therefore the

density decreases. Water has a maximum

density at 4 °C.

therefor assertion and reason in the 2nd qts. is false.

sushma12

At 4 degree centigrade water has minimum volume so when temperature of water is decreased in B how could the volume be decreased?

me_coolguy_iit_aspirant

i think assertion is true but reason is false......

because acceleration of the freely falling body is =gdownwards.

but when a particle is projected inside it.its accn. is up{that is y the body is travelling up}.thus accn. of particle can b >or<or=g{in upward direction}.

therefore,A-is true...and R-is false.

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