I belive it’s 4 atoms for each
i believe it is c but i could be wrong. (i’m sorry if i am)
Galileo saw a pendulum and wondered why it took the same amount of time moving back and froth. He noted the time the pendulum took it to hold it to his heart. He noted his heart beats as a reference of the small times the pendulum took to reach a particular distance.
Answer:
The shorter train has a length of 600m
Explanation:
The equation of motion of the first train can be written as:
(1)
v' = 108km/h = 30m/s
Furthermore, you can write the equation of motion of the second train as:
= xo + vt (2)
v = 36km/h = 10m/s
where you have taken the initial position as measured from the front of the first train to the front of the second one. l is the length of the second train and 200 the separation of it respect to the first train.
For t = 40 both trains have the same position, that is, x=x'. Then, you equal equations (1) and (2), replace t=40, and solve the equation for l:
Hence, the first train has a length of 600 m
The train behind, or the second train, has twice the length of the first train:
The shorter train has a length of 600m
If the object's <em>velocity is constant</em> ... (it's speed isn't changing AND it's moving in a straight line) ... then the net force on the object is zero.<em> (D)</em>
Either there are no forces at all acting on the object, OR there are forces on it but they're 'balanced' ... when you add up all of their sizes and directions, they just exactly cancel each other out, and they have the SAME EFFECT on the object as if there were no forces at all.