SEE Science Notes (What Does It Mean When We Say)
WHAT DOES IT MEAN WHEN WE SAY -
The value of gravitational constant is 6.67×10-11Nm2/Kg2
Ø It means that 6.67×10-11N
force is acting between two bodies of unit mass separated by unit distance.
The value of Acceleration due to gravity is 9.8m/s2
Ø It means that when body
falls towards the earth only under the influence of gravity its velocity
increases by 9.8m/s in every second.
The value of gravitational field intensity is 9.8 N/Kg
Ø It means that 9.8 N
force of attraction is felt by unit mass placed at a point in the gravitational
field.
Specific Heat Capacity of Water is 4200 J/Kg
Ø It means that 4200 J of heat is required to increase the temperature of unit mass of water by 1.
Frequency of Electricity is 50 Hz
Ø It means that the
polarity of A.C. changes 50 times per second.
Blood Pressure of Human Being is 120/80mm of Hg
Ø It means that his/her normal systolic pressure
is 120mm of Hg and disystolic blood pressure is 80 mm of Hg.
Meaning
of 1 kWh
Ø The energy consumed by
an electrical appliances having power rating of it is 1kW in one hour.
Meaning of 1 Joule
Ø It is defined as the
amount of heat required to raise the temperature of body having mass 1kg by 1
Meaning of 1 Calorie
Ø It means that 1 Joule
of heat is required to raise the temperature of 1 g of water by 1.
Meaning of 1 Dioptre
Ø It means that the focal
length of that lens is 1m.
Meaning of 1 Pascal
Ø It means that 1 N force
is acting in unit surface area of substance.
Meaning of Current rating of wire is 5 Ampere
Ø It means that the
maximum 5 Ampere of current can be passed through the electric wire with
safety.
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