Phy Ws
Phy Ws
Phy Ws
1. FLUID STATICS
2.FLUID DYNAMICcs
How does the viscosity of fluid depend upon temperature?
The diameter of ball A is twice of that of B. What will be the ratio of their terminal velocities in
water?
9 An incompressible liquid travels as shown figure. Calculate the speed of the fluid in the lower branch
0.15m
.15msms 2m/s
0.18m
10
a)
enoulli's theorem and write mathematical form ofit. (with diagram)
b)
11. a)
Why light roofs are blown off during wind storm?
Derive equation of
b) continuity
Why the area of cross
12.
Name the
section of water coming down a tap decreases?
13. energies possessed by a fluid (or) liquid.
State and
14 explain Bernoulli's principle
Under what
15
conditions Bernoulli's theorem can be used'?
Explain any 2 applications of
16. Bernoulli's principle
Why light roofs are blown off
17. during wind storm?
What is (i)
18
velocity head (ii) pressure head?
Explain the dynamic lift felt by an air foil
19 At what
cutting through air?
speed will the velocity head of a stream of water be
20 ne reading of a pressure meter equal to 40 cm?
attached to closed pipe is 2.5 10 Nm. On
a
e pipe, the reading of the pressure meter reduces to 2.0x 10 Nm". opening the valve of
x
2 KE
10. State Newtons laws of mofion.
A) Define impulse
b) A body of
mass 2 kg at rest acted upon by a foree. The variation of force wilh
time is as
shown below. Find the speed acquired by the
12 Two bodies of masses mi and m (ma> m) are connected hy means of a string passing over a i t
tixedpulley hanging in vertical plane. Find the acceleration of the system of bodies and tenakon
the string
4. FRICTION
5. CENTRE OF MASS
1. Two particle of mass 2gm and 4gm are separated by a distance 12cm. Find the position of center of
mass from 2gm.
2 Two bodies of identical mass are moving with velocities 2i m/sec and 2) m/sec. Find the velocity of
their center of mass.
3 Form a circular disc of radius 'R', a small cireular disc of radius R/2 is removed such that the cavity
portion just touches the edge of the disc. Find the shift in center of mass.
4. What are the characteristics of center of mass?
5 Three identical particles are placed at the comers of an equilateral triangle of side 'a', Find the
co-ordinates of center of mass from any vertex
6. WORK POWER ENERGY
Define power. Mention its S.I. units
What is kilo-watt- bour? Give its value
in joule
rce ofF=f+j-k)N acts on a body causes displacementi =(2i+ j-kjm.Find the work done
by the force
wO persons 'A" and 'B' lifting 1000 litres of water from a well of depth 1Om in 1hr and 2hr
respectively. Which one having more energy? Give reason. F(9)
5 Find the work done by the force 100
using the following graph.
26
6 A man runs a distance "S' on a level road. The same man ascends up a hill with the same velocity
through the same distance. When does he do more work!
7. Mention the relation between momentum (P) and kinetic energy (E). If momenturm of a body 15
doubled how does its K.E. change?
8 t the mass is reduced to half and the velocity is doubled what happens to its K.E?
9 A machine gun fires 540 bullets per minute each of mass 150gm with a velocity 720 kmph. Find the
power of the gun.
10. ) Define K.E. ii) Derive K.E =mv. ii) Obtaintheexpression for P.E.
of a body. i)
iv) The velocity of a body is reduced to half of its oiginal value. Find the percentage decrease in
its K.E.
1 A force (2i+j-k)N displaces a body from (0,2, 1pm to (3, 2, 3)m. Findthework done bythe force
12 What type of energy possessed by a flying bird?
13 Obtain the relation between momenturn and KE of a body.
14. A man of mass 70kg carries a bag ofweight 30 kg to a height of 10m. Find the work done by Human.
15. A body mass 10 kg is moving with a velocity (10i+ 10j + 10k) m/s. Find the magritudes of its
momentum and K.E.
16. Water in a river flowing with a velocity 5 m/sec. Find the energy carried by 10m of water in the
river flow.
17. Find the work done by the force in the following.
F(N)
V(m/sec)
20 10
i) >s{m) i)
t[sec) er
18 State and prove work-energy theorem.
19 A body ofmass 1kg dropped freely from on height of 1Om. Find ts at the bottom
20. i) A simple pendulum of length 'T is released from an angle 60" to the vertical. Find the speed of
the bob at mean position.
A body of mass 'm' dropped from the top of a smooth inclined plane of height 'h'. Find its
speed at lowest position.