A rock is dropped from a third story window to the ground below. Assuming air resistance can be ignored, as it falls: a) only it
1 answer:
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The correct statements are "Each orbit holds a fixed number of electrons" and "The n=1 orbit can only hold two electrons." According to the Bohr model, the maximum number of electrons that can occupy an orbit is given by , where n is the number of the orbit. For instance, when n=1 it means
. This particular orbit can only hold up to two electrons. Even though the electrons can gain energy and move to higher orbits or electrons from higher orbits can lose energy and drop to the n=1 level, the energy level would not allow more electrons to enter the orbit once it is full. Again the octet rule, which states that atoms achieve stability by having 8 valence electrons, limits the maximum number of electrons that can be occupied by an orbit. The gain and loss of electrons is done to achieve the noble gas configuration and once that is reached no more electron can be added to an orbit
acceleration of car is 1.8 m/s^2
time = 14 s
initial speed = 14 m/s
so the final speed is calculated by
so the total distance moved in this interval of time is
now the average speed is given as
so the average speed will be 26.6 m/s
The force of friction is 330 N
Explanation:
We can solve this problem by applying Newton's second law of motion, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:
where
is the net force
m is the mass
a is the acceleration
For the crate in this problem, we have 3 forces acting on it:
- The force applied by the 1st child, forward
- The force applied by the 2nd child,
- The force of friction, , acting backward
So the net force is
We also know that the crate remains stationary, which means that its acceleration is zero:
a = 0
Therefore, we can rewrite Newton's second law as
From which we find
Learn more about friction and Newton's second law:
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