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Answer is B. It is the total distance the object has trvelled regardless of where it has travelled.
Answer 'D"
Path length is a scalar quantity as it is the distance travelled by an object.
Answer "D".
The position of a moving body is specified using a co-ordinate system with reference point.
Radius of hydrgen atom = 0.5*10^(-3)
volume of hydrogen atom= (4/3)*(22/7)*(0.5*10^(-3))^3
= 0.524*10^(-30)cu.m
Now 1 mol of hydrogen contains 6.023*10^23 atoms
therefore volume of 1 mol of hydrogen atom Va = 6.023*10^23*0.524*10^(-30)
=3.16*10(-7) cu.m
molar volume of 1 mol of hydrogen atom at STP Vm= 22.4*10(-3) cu.m
therefore the ratio (Vm/Va) = 22.4*10^(-3)/3.16*10(-7)
=7.08*10^4
Hence the molar volume is 7.08*10^4 times higher than the atomic volume. For this reason the inter-atomic seperation is much larger than the size of hydrogen atom.
Horse is a unit of power. it is the measure of rate at which work is being done.
,the number 48,923 has 5 significant digits.
Physical quantity is a property of a body which can be measured. therefore the answer is D.
answer A
Answer D. there are two significant digits as zero is considered to be non significant digit
A dimensionless qunatityhas no unit
Speed is not a vector quantity. It has only magnitude and no direction and hence it is a scalar quantity.
Pascal second is the SI unit of Coefficient of viscosity. and its dimensions are [M1L-1T-1]
The number 2076 has 4 significant digits
In abody centerd cubic cell, there are 9 atoms. out of which 8 atos are located at the 8 corners of the cube and the 9th atom is at the center of the cube. the 8 atoms at the corners of the cube are shared by the neighbouring unit cells. In total 8 units cells can be placed adjoining a corner of a unit cell. hence every atom at the corner of the unit cell is shared by other 8 unit cells. hence 1/8th portion of an aatom is present in the unit cell.