Density is mass per volume
Answer:
6. W = 3 m g h
Explanation:
Displacement in moving from first floor to the fourth floor is 3h, and the total energy consumed in this process is (3.m.g.h) which is equal to the work done.
According to the work-energy equivalence the change in energy of a system is equal to the work done.
Here, change in potential energy:




Answer:
q2 = 5.1μC
Explanation:
From a forces diagram we can stablish that:
Fe = T*sin(16) (eq1)
T*cos(16) = m*g (eq2)
Where Fe is the electric force and T is the tension of the string. Solving for Fe:
Fe = m*g*tan(16)
The magnitude of the electric force is calculated as:
Solving for q2:
