Answer:
A: It decreased trade because soldiers no longer protected the oases.
I took it on E2020. I hope I've helped. If you need further explanation, please comment below.
Answer:
Explanation:
A ) The spheres are non conducting , charge will not move on the surface so neutralization of charge by + ve and - ve charge is not possible. Charges will remain intact on them . The electric field inside them will be zero . Electric field outside shell will not be spherically symmetrical . Lines of force will emanate from the surface of positively charged shell outwardly oriented and end at negatively charged shell .
B )
distance between the centres of spherical shell
= 2 a
potential energy of charges
= k q₁ x q₂ / R
= k x - Q x Q / ( 2a )
= - k Q²/ 2a
So work needed to separate them to infinity will be equal to
= k Q²/ 2a
Answer:
A. 20 m/s north
Explanation:
The velocity of the car can be calculated as:
where
d is the displacement
t is the time interval
Taking north as positive direction, the initial position of the car is
(south)
while the final position is
(north)
So, the displacement is
(north)
The time interval for the motion is
t = 15 s
So, the velocity of the car is
(north)
p = mv so this question pertains to conservation of momentum.
The momentum of the car is 1320*12 = 15840kgms^-1
For the sake of easiness and the fact negatives are annoying, I will assume east to be positive.
So we know 9.4m - 15840 = (1320+m)*1.5
9.4m - 15840 = 1980+1.5m
Rearranging to solve for m
7.9m = 17820
m = 2255.70 = 2300kg to 2sf
Answer:
Explanation:
As the pendulum is slightly shifted to the left then we have restoring torque on it given as
so here we have
here we know that
also for small angular displacement
now we have its moment of inertia about suspension point given as
now it is given as
so we have
so angular frequency is given as