They enable us to dig deeper into the electron configurations by making us focus on electrons' quantum nature
By the work energy theorem, the total work done on the stone is given by its change in kinetic energy,

We have


Then the total work is

Answer:
The downwards acceleration is 3.53 m/s2.
Explanation:
Let the true weight is m g.
The reading of the balance, R = 0.64 mg
Let the acceleration is a.
As the apparent weight is less than the true weight so the elevator goes down wards with some acceleration.
Use Newton's second law
m g - R = m a
m g - 0.64 m g = m a
0.36 g = a
a = 3.53 m/s2
Explanation:
to go fast from to one place to another
Answer:
a) It will be easier to apply all her force as far as possible from the axle
b) There is a net torque applied
Explanation:
a) Applying a larger force far away from the axle of the door produces a larger force on the torque than pushing it near the axle. This is because Increasing the lever arm between the axle and the point at which you push the door increases the torque on the door
b)The door is turning faster and faster because you are exerting a torque on it and its undergoing angular acceleration. There is a net torque which is the addition of the torque applied on the opposite sides of the door