Question

1.
If a b and c
are the position vectors of the points A(2, 3, – 4),
B(3, - 4, - 5) and C(3, 2, - 3) respectively, then là + + < | is equal
to
(A)
V113
(B)
185
(C)
203
(D)
209
P​

Answer 1

Step-by-step explanation:

(a) we know,

P =dgh where, h is dpeth , g is accⁿ due to gravity and d is density of liquid .

Therefore , pressure increases, when depth increases . so, the blood pressure in humans is greater at the feet than the brain .

(B) The density of air is maximum at the surface of the earth and decrease rapidly with height. At height of 6 km , the density of air decreases nearly half of its value at the sea level. Beyond 6km height , the density of air decreases very slowly with height .hence, the atmosphere pressure at the height of about 6km decreases to nearly half of its value at the sea level .

(c) according to Pascal's law,

Pressure is transmitted equally in all directions inside the liquid. it means hydraulic pressure has no fixed direction . so, it's scalar quantity.