D) 8N/s 9. Ifone knows only the constant resultant force acting on an object and
ID: 2303808 • Letter: D
Question
D) 8N/s 9. Ifone knows only the constant resultant force acting on an object and the time during which this force acts, one can determine the A) Change in momentum of the object B) Change in velocity of the object C) Change in kinetic energy of the object D) Mass of the object Which of the following statements is true when an object of mass m moving on a horizontal, frictionless surface hits and sticks to an object of mass M> m, which is initially at rest on the surface? 10. A) B) The collision is elastic. All of the initial kinetic energy of the less-massive object is lost. C) The momentum of the objects that are stuck together has a smaller magnitude than the initial momentum of the less-massive object. D) The speed of the objects that are stuck together will be less than the initial speed of the less-massive object. 11. An empty sled of mass M moves without friction across a frozen pond at speed vo Two objects are dropped vertically into the sled one at a time: first an object of mass m, and then an object of mass 2m. Afterward, the sled moves with speed vs What would be the final speed of the sled if the objects were dropped into it in reverse order? A) B) C) v D) 2v A mass m is attached to a horizontal massless spring with spring constant k and is set into simple harmonic motion. Its maximum displacement from its equilibrium position is A. What is the mass speed as it passes through its equilibrium position? 12. A) A B) A C) D) rm 71Explanation / Answer
9. From 2nd equation of motion,
F= (change in momentum)/time
Change in momentum= F*t
Option (a) is correct.
10. Using conservation of momentum
mv + MV = (m+M) Vf
as V= 0
Vf= mv/(m+M)
As m/(m+M) < 1
So, Vf < v
Option (d) is correct.
11. Conservation of momentum doesn't depends on order of incidents, so velocity still remains same as before. I.e. Vf
Option (c) is correct.
12. Angular frequency, w= (k/m)^0.5
Max velocity is given by, v= Aw= A (k/m)^0.5
Option (a) is correct
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