Answer:
A. Speed is a scalar quantity and velocity is a vector quantity.
Explanation:
A scalar quantity is one that consists of only a numerical value.
Speed is a scalar quantity because only the instantaneous value is indicated, for example the speedometer of a car that tells you your speed at the moment but not where you are going or in what direction are you going.
On the other hand, velocity is a vector quantity. Because it is composed of a <u>magnitude and a direction</u>, for example 10m/s to the south is a velocity, and 10m/s is a speed.
Length of the sheet is given as
width of the sheet is given as
now let say its thickness is "t"
so the volume of the sheet is given as
mass of the sheet is given as
now we have
by solving above we have
so the thickness of sheet will be above
The mass of the petcock of the pressure cooker is 0.257 kg.
The total pressure inside the cooker is= atmospheric pressure+Gauge pressure
=100 kPa+101 kPa=201*10^3 Pa
The area of the petcock is= (π/4)d^2=0.785*0.004^2=12.56*10^(-6) m^2
Now the mass of the petcock is calculated as
P=(F/A)=(mg/A)
201*10^3=(m*9.81/(12.56*10^(-6)
m=0.257 kg
Therefore the mass of the petcock is 0.257 kg
This is an example Newton's Third Law. All the kinectic energy from the moving car transferred the potential energy of the parked car. This potential is not much since the brakes are on (hopefully) and it's not in a non-moving position.
