Object A is acted on by only object B. The mass of object A is 20.0 kg and its acceleration is 4.00 m/s2 west. Object B is acted on by two forces, the force of object A on object B and another unknown force
If mass of object B is 40.0 kg and the acceleration of object B is 3.00 m/s2 west, what is the unknown force?
A)
40 N west
B)
120 N west
C)
80 N east
D)
200 N west
E)
80 N west
D
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Consider the following statement, and explain whether or not it is sensible: Last night I saw Mars move westward through the sky in its apparent retrograde motion
What will be an ideal response?
Rank the following kinds of waves according to their frequencies from highest to lowest:
(a) gamma rays (b) microwaves (c) radio waves (d) visible light (e) x-rays
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a. 60 m/s2 b. 56 m/s2 c. 40 m/s2 d. 50 m/s2 e. 46 m/s2