Explanation:
Speed : It is defined as the overall distance travelled by an object divided by total time taken. The mathematical expression is given by :
It is a scalar quantity i.e. it has only magnitude.
Velocity : It is defined as the total displacement (D) of the particle divided by total time taken. It can be given by :
It is a vector quantity. It have both magnitude and direction.
Out of given options, the statement that best explains the difference between velocity and speed is (B) i.e. "Velocity is a vector and requires a direction to completely describe it".
Answer:
Explanation:
Given two mass on an incline code and
and an angle of inclination
.
. Assume that
is the weight being pulled up and
the hanging weight.
-The equations of motion from Newton's Second Law are:
where a is the acceleration.
#Substituting for (tension) gives:
#and solving for
which is the system's acceleration.
Explanation:
Given that,
The mean kinetic energy of the emitted electron,
(a) The relation between the kinetic energy and the De Broglie wavelength is given by :
(b) According to Bragg's law,
n = 1
For nickel,
As the angle made is very small, so such an electron is not useful in a Davisson-Germer type scattering experiment.