They were able to find the orbit of a comet and predict the year of its return.
Answer:
e:10 m b: -5 m/s b.The object decreases its velocity.
Explanation:
Answer:
because there is many places for it to bounce of of creating another soundwave
Answer:

Explanation:
Frequency of each electromagnetic wave is same thus we can interfere them along X axis in Phase diagram.
In phase diagram indicate each wave as vector with amplitude as length and phase difference as angle. (shown in attachment)
Now take component of E2 and E3 amplitude along X direction.
Net amplitude of all E in X direction =
+ cos(45)[
+
]
⇒
Final resultant have no change in frequency
So , resultant is 
Answer:

Explanation:
When a suspended string makes and angle of 25 degree while aircraft is accelerating on runway then we can use force equations to find the acceleration of the aircraft
So we will have


now from above two equations we have



now if it took 18 s to take off we can have final speed of the aircraft given by


