Mechanics | Relativity Answers

A ball of mass 100g is dropped at time t=0. A second ball of mass 200g is dropped from the same point at t=0.2s .The distance between the center of mass of two balls and the release point at t=0.4s is:.......(Assume g=10m/s^(2) )
Ans:0.4m

A bullet of mass m moving horizontally with speed u hits a wooden block of mass M that is suspended from a massless string.The bullet gets lodged into the block and comes into halt.If the block-bullet combine swings to a maximum height h then how much of the initial kinetic energy of the bullet is lost in the collision?
Ans: mM u²/2(m+M)

a ball is dropped from a height h from rest.the ball travels (h/2) in last 1.0s the total time taken to the ball hit the ground is...
Ans 3.41s

explain excess pressure of a soap bubble.

write down surface tension of needle of length L.

write down short note on surface tension.

Consider a parallel plate capacitor which is maintained at potential 200V .
The separation distance between the plates of capacitor and the area of plates are 1mm and 20cm^(2) respectively.Calculate displacement current in 1microsecond .
ANS: 3.5mA

from a uniform circular sheet disc of radius 2cm(its centre of mass is at O), a circular portion of radius 1cm is removed such that shift in centre of mass is maximum. the disc is now rotated about O perpendicular to the plane through α, then the magnitude of displacement of new centre of mass is 1/√3 cm, then α is
Ans 120°

What is the sum of an objects kinetic energy and potential energy?