Aim – To measure area, volume, mass, weight of a book and calculate pressure offered by each surface in C.G.S and S.I unit (dyne/cm2 and N/m2 ). Apparatus – i) Book and scale. Working Formula: i) Volume = length X breadth X height ii) Mass= volume X density iii) Weight = mass X acceleration due to gravity iv) Area = length X breadth v) Pressure = Weight/ area. Procedure – i) Take a scale in hand. ii) Measure the length of book. iii) Measure its breadth. iv) Measure its height. All measurements must be in cm. i) Calculate volume by using working formula in cm3 . ii) Convert cm to m and calculate in m3 . iii) Calculate area of three surfaces: (a) A1= l x b, (b) A2= b x h, (c) A3= l x h in cm2 and m2
Answers
Answer:
Quantities Dimensions MKS and CGS Units
mass mass
MKS: kilograms (kg)
CGS: grams (gm or g)
distance, depth, length,
height, width distance MKS: meters (m)
CGS: centimeters (cm)
time time seconds (sec or s)
temperature temperature Kelvin (K) and
Centigrade (degrees C)
area distance × distance MKS: m2
CGS: cm2
volume
distance × distance
× distance
(i.e., distance3
)
MKS: m3
CGS: cm3
density mass/volume
(i.e., mass/distance3
)
MKS: kg/m3
CGS: gm/cm3
speed; velocity (motion)
(rate of change of
position)
distance/time MKS: m/s
CGS: cm/s
acceleration
(rate of change of an
object’s velocity with
respect to time)
(distance/time)/time
(i.e., distance/time2
)
MKS: m/s2
CGS: cm/s2
force
(“push” or “pull” that can
change an object’s
motion)
(Note that weight is just a
special case of a force—
the force of gravity)
mass × acceleration
or
mass × distance/time2
MKS: kg × m/s2
(Newton)
CGS: gm × cm/s2
(dyne)(cont’d) Dimensions MKS and CGS Units
pressure
(collective force exerted
by random molecular col-
lisions against each unit of
area of an object’s
surroundings)
force/area
or
(mass
× distance/time2
)/area
or
energy/volume
MKS: N/ m2
or (kg × m/s2
)/m2
(Pascal)
CGS: dyne/cm2
work
(force times distance over
which the force is applied
to an object as the object
moves under the influence
of the force);
energy
(the capacity to do work)
force × distance
or
mass × acceleration
× distance
or
pressure × volume
MKS: Newton x m
or kg × m2
/s2
or Pa × m3
(Joule)
CGS: dyne × cm
or gm × cm2
/s2
(erg)
power
(energy transferred or
gained or lost per unit
time)
energy/time
or
force × distance/time
or
force × velocity
etc.
MKS: J/s
or N × m/s
or kg × (m/s2
) x m/s
(Watt)
CGS: erg/s
energy flux
(rate at which energy is
transferred, absorbed, or
lost per unit time per unit
surface area)
(energy/time)/area
or
force
× (distance/time)/area
etc.
MKS: (J/s)/m2
or W/m2
CGS: (erg/s)/cm2