Question
Q A CURVE IS REPRESENTED BY y=sinx IFx IS CHANGED FROM PIE/3 TO PIE/3+PIE/100, FIND APPROX. CHANGE IN x?
Q A CAR IS GOING DUE NORTH AT A SPEED =50km/h IT MAKES A 90* LEFT TURN WITHOUT CHANGING SPEED THE CHANGE IN VEL. OF CAR IS=? (ANS 70km/h towards south west ) i want to know that here we are just changing the directn so only directn. shd. b change but here magnitude is also changing HOW?
FLUIDS
Q A BAROMETER KEPT IN N ELEVATOR READS 76cm WHEN IT IS AT REST . IF ELEVATOR GOES UP WITH INCREASING SPEED READING WILL BE <76 cm . IS REASON IS THAT PRESSURE IS DIRECTLY PROPTn TO HEIGHT ?
I think we have to caculate change in y
since y = sin x
so dy = cosx dx = cosπ/3* π/100 = π/200
the initial velocity of car = 50j and after turn velocity = -50i here i and j are the unit vectors along east and north direction
so change in velocity = -50i - 50j
its mod = 50 √2 = 70
Because in barometer the extra Hg level will experience a downward force so Hg level will decrease.