Vincent Mary School of Engineering
BG1211 Physics I
Assumption University
Home Work 05
BG1211 PHYSICS I
HOME WORK 5
1. The launching mechanism of a popgun consists of a triggerreleased spring (Fig.2). The spring is compressed to a position 𝑦𝐴
and the trigger is fired. The projectile of mass m rises to a
position
𝑦𝐶 above the position at which it leaves the spring,
indicated in Fig.1 as position 𝑦𝐵 = 0. Consider a firing of the gun
for which 𝑚 = 37.5𝑔,
𝑦𝐴 = −0.150𝑚, and 𝑦𝐶 = 26𝑚.
(a) Neglecting all resistive forces, determine the spring constant.
(5 points)
(b) Find the speed of the projectile as it moves through the
equilibrium position B of the spring as shown in Fig.2.
(5 points)
2.
A 0.50-kg particle has a speed of 𝟑. 𝟎𝟎𝒎𝒔−𝟏 at point A and
kinetic energy of 𝟖. 𝟎𝟎𝑱 at point B.
(a)Find the kinetic energy of the particle at point A.
(3 points)
(b)Find the speed of the particle at point B.
(3 points)
(a) Find the net work done on the particle by external forces as it
moves from point A point B.
(4 points)
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This exam paper is ABAC’s property and cannot be distributed or duplicated without proper authorization.
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Vincent Mary School of Engineering
BG1211 Physics I
Home Work 04
Semester 1 - 2019
1
This exam paper is ABAC’s property and cannot be distributed or duplicated without proper authorization.
Vincent Mary School of Engineering
BG1211 Physics I
Home Work 04
Semester 1 - 2019
2
This exam paper is ABAC’s property and cannot be distributed or duplicated without proper authorization.
Vincent Mary School of Engineering
BG1211 Physics I
Home Work 04
Semester 1 - 2019
Intentionally blank paper
3
This exam paper is ABAC’s property and cannot be distributed or duplicated without proper authorization.