Answer:
Explanation:
The inital electrostatic force between the two spheres is given by:
where
is the initial force
k is the Coulomb's constant
q1 and q2 are the charges on the two spheres
r is the distance between the two spheres
The problem tells us that the two spheres are moved from a distance of r=20 cm to a distance of r'=10 cm. So we have
Therefore, the new electrostatic force will be
So the force has increased by a factor 4. By using , we find
Answer:
200 W
Explanation:
The power is given by the ratio between the amount of work done and the time taken to perform the work:
where in this problem we have
W = 2600 J is the work done
t = 13 s is the time taken to do the work
Substituting the numbers into the equation, we find
Answer with Explanation:
We are given that
Mass of rider=m=77 kg
Mass of bike =m'=7.3 kg
Initial velocity,u=9.3 m/s
Final velocity,v=6 m/s
A.Change in velocity=v-u=6-9.3=-3.3 m/s
Total mass,M=m+m'=77+7.3=84.3 kg
Change in momentum=
B.Impulse=Ft=Change in momentum=-278.19kg m/s
C.Time,t=13.2 s
Using the formula
F=
D.