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there won't be any change in the temp... coz on one side the open door tries to cool the room whereas on the other side the motor of the refrigerator gives out the heat... hence there is no change in temp...

this answer i'm really sure of....

trust me!

thanks krishna.gopal....

check out this link

rate if satisfactory

http://www.goiit.com/posts/list/geometry-cmn-tangent-49947.htm

please i could do with some help here...

please can somebody help me out over here????

hello people..

does it hurt to reply......

hope that made sense

differentiating eqns.

finding the slope

eqns of the tangents will be equal

you'll do just fine with them...goood luck!

Two trains A and B are moving with speeds 20 m/s and 30 m/s respectively in the same direction on the same straight track, with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle.

Assume that the sound of the whistle is composed of components varying in frequency from f1 = 800 Hz

to f2 = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency - lowest

frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s.

Intensity

f1 f2 Frequency

14. The speed of sound of the whistle is

(A) 340 m/s for passengers in A and 310 m/s for passengers in B

(B) 360 m/s for passengers in A and 310 m/s for passengers in B

(C) 310 m/s for passengers in A and 360 m/s for passengers in B

(D) 340 m/s for passengers in both the trains

happy b day bro.

wait a min... with C you get A4 and C4 as independent..

p of a intersection b = p of a * p of b

definition of independent events...

yea it's c....