A 0.2 kg hockey puck (puck A) slides on the ice with a velocity of 1.5 x m/s. It
ID: 1453062 • Letter: A
Question
A 0.2 kg hockey puck (puck A) slides on the ice with a velocity of 1.5 x m/s. It collides with a 0.25 kg puck (puck B) that was initially at rest in a 1-D elastic collision. What is the velocity of puck B after the collision? A) 1.5 x m/s B) -0.17 x m/s C) -0.9 x m/s D) 1.7 x m/s E) 1.3 x m/s 2) A traveler pulls on a suitcase strap at an angle of 29degree above the horizontal. The tension in the strap is 50.0 N, the weight of the suitcase is 78.0 N, and the coefficient of kinetic friction between the suitcase and the floor is 0.25. Find the magnitude of the net force on the suitcase. A) 0 N B) 24.2 N C) 19.2 N D) 30.3 N 3) A car of mass 1200 kg travels with a velocity of 36.0 x + 25.0 y m/s. Find the magnitude of the car's momentum. A) 73, 200 kg m/s B) 1921 kg m/s C) 52, 600 kg m/s D) 86, 400 kg m/s E) 20, 400 kg m/sExplanation / Answer
1) E) 1.3 x^ m/s
let
m1 = 0.2 kg, u1 = 1.5 m/s
m2 = 0.25 kg, u2 = 0
v2 = 2*m1*u1/(m1+m2)
= 2*0.2*1.5/(0.2+0.25)
= 1.3 m/s
2) D) 30.3 N
Fnet = F*cos(29) - N*muek
= F*cos(29) - (m*g - F*sin(29))*mue_k
= 50*cos(29) - (78 - 50*sin(29))*0.25
= 30.3 N
3) C)52600 kg.m/s
|P| = m*|v|
= m*sqrt(vx^2 + vy^2)
= 1200*sqrt(36^2 + 25^2)
= 52600 kg.m/s
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