1e) If a particle is moving along a curved path with constant speed, its acceler

Question

1e) If a particle is moving along a curved path with constant speed, its acceleration is: a. O b. Tangent to the path c. Normal to the path toward center of curvature d. Normal to the path away from center of curvature 1d) Aparticle strikes a smooth surface with velocity viand coefficient of restitution e o.8. After the collision, the x component of velocity (Vx)2 is a. O b. Less than (V)1 c. Greater than (V)1 d. Equal to (Vx)1 1) Two trains A and Bare traveling with speeds shown. What is the velocity of Brelative to A? a. 30j ft/s b. 30j ft/s c. 7oj ft/s d. 7oj ft/s A.

Explanation / Answer

(1) Since the particle is continuously changing the direction . The particle will have an acceleration tangential to its path

Answer is Option b) tangential to its path

(2) Only Y component of velocity changes. (Vy)2 = e (Vy)1

X component doesn't change

(Vx)2 = (Vx)1

Answer is Option d. equal to( (Vx) 2

(3) Vb = 50 ft/s

Va = - 20 ft/s

Relative speed of B wrt A = Vb - Va = 50 + 20 = 70 j ft/s

Answer is Option d) 70 j ft/s

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