Numericals unit 6 class 11 physics nbf || by atif ahmed || 11th class physics || nbf || problems

Numericals unit 6 class 11 physics nbf || by atif ahmed || 11th class physics || nbf || problems unit 6 || federal board || National book foundation

☆☆☆☆Time Table ☆☆☆☆

00:00:00 Introduction
00:00:40 Numerical 6.1
00:04:56 Numerical 6.2
00:09:49 Numerical 6.3
00:15:36 Numerical 6.4
00:19:29 Numerical 6.5
00:26:41 Numerical 6.6
00:36:41 Numerical 6.7
00:41:23 Numerical 6.8
00:49:13 Numerical 6.9
00:54:42 Numerical 6.10
01:01:57 Numerical 6.11

solution of these problems is given

(1) The settling speed of a small fog droplet in air is found to be 2.98 mms¹. Find out the radius of the droplet. The coefficient of viscosity of air is 1.9×10kg m¹ s". (Ans: 5.1×10m)

(2) Water is flowing at a velocity of 2.00 m/s through a hose with an internal diameter of 1.60 cm. (a) What is the flow rate in liters per second?

(Ans: 0.402 L/s, 0.584 cm)

(b) The fluid velocity in this hose's nozzle is 15.0 m/s. What is the nozzle's inside diameter?

(Ans: 27 cm/s)

(3) Blood is pumped from the heart at a rate of 5.0 L/min into the aorta (of radius 1.0 cm). Determine the speed of blood through the aorta.

(4) Water flows through a pipe whose internal diameter is 4 cm at a speed of 2 m/s. What should be the diameter of the nozzle, if the water is to emerge out with a speed of 4 m/s.

(Ans: 3 cm)

(5) A hose lying on the ground has water coming out of it at a speed of 5.4 m/s. You lift the nozzle of the hose to a height of 1.3 m above the ground. At what speed does the water now come out of the hose?

(Ans: 1.9 m/s)

(6) A pipe has two different cross-sectional areas, A₁ = 25 cm² and A2 = 4 cm² respectively. The volumetric flow rate of water through the pipe is 5x10³ m³/s. Determine:

(a) the speed of water in both cross-sectional areas of the pipe.

(b) the pressure difference between them. (p = 103 kg/m³)

(Ans: 2 m/s, 12.5 m/s, 7.6 x 104 Pa)

(7) The speed of water in a hose increased from 1.96 m/s to 25.5 m/s going from the hose to the nozzle. Calculate the pressure in the hose, given that the absolute pressure in the nozzle is 1.01x 105 N/m² (atmospheric, as it must be) and assuming level and frictionless flow.

(Ans: 4.24x 105 N/m²)

(8) A hole is drilled at the bottom of a full bucket of water of height h. What will be the velocity of water that exits from the hole?

(9) The efflux speed of an oil from a narrow hole of a tank is 33.8 m/s, at pressure of 4.12×105 Pa. Calculate the density of the oil?

(Ans: 0.72 kg/m³)

(10) If the speed of air across the top and bottom of a small aeroplane's wing is 30 m/s and 20 m/s respectively. Calculate the pressure difference between the top and bottom of wings if p = 1.29 kg/m³, for air.

(Ans: 322.5 Pa)

11) An empty metrological balloon has weight 80 N. How much maximum contents the balloon can lift besides its own weight if it is filled with 10 m³ of hydrogen? (Density of hydrogen = 0.09 kgm³, Density of air = 1.3 kgm³).

(Ans: 41 N)
#newbook2025
#nbf
#nationalbookfoundation
#byatif
#physics
#class11
#federalboard
#atifahmedofficial
#numericals
#unit6