Numerical problems
1.Which of the following is not a factor affecting buoyant force?
a. Volume of the submerged object
b. Density of the liquid
c. Shape of the object
d. Acceleration due to gravity
c. Shape of the object
A ball of mass 2 kg is dropped from a height of 10 m. Calculate its potential energy, kinetic energy, and total energy:
(a) At the top of its motion.
KE= 0
PE= 200J
TE= 200J
(b) When it is halfway down.
PE= 100J
TE= 200J ==> KE= 100J
2.An object of mass 100 kg is at a height of 10,000 m above the surface of the Earth. Calculate the gravitational force acting on the object. (Mass of Earth M=5.97×10^24 kg ,Radius of Earth R=6.4×10^6 m, g=9.8 m/s2 ).
Compute distance 'D'
D= R + h= 6.41×106m
Working Formula is g = GM/D2