The heart of a man pumps 5 L of blood through the arteries per minute at a pressure of 150 mm of mercury . If the density of mercury be 13.6 x 103 kg/ m3 and g = 10 m/s2, then the power of heart in watt is
1.70
2.35
3.0
3.0
A.
1.70
Given, pressure = 150 mm of Hg
Pumping rate of heart of a man
=
A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is
A.
Let the length of a small element of tube be dx.
Mass of this element
where M is mass of filled liquid and L is length of tube.
Force on this element
On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision, the first block moves at an angle θ to its initial direction and has a speed v/3/ The second block's speed after the collision is
3/4 v
>
A.
Water falls from a height of 60 m at the rate of 15 kg /s to operate a turbine. The losses due to frictional
8.1 kW
10.2 kW
12.3 kW
12.3 kW
A.
8.1 kW
Power generated by the turbine is,
Pgenerated = Pinput x 90/100