As Shown in the Figure, a 1 $v_{1} = 1.2 \mathrm {~m} / \mathrm { s }$

question 210

Multiple Choice

As shown in the figure, a 1.45-kg block is held in place against the spring by a 21-N horizontal external force. The external force is removed, and the block is projected with a velocity $v_{1} = 1.2 \mathrm {~m} / \mathrm { s }$ as it separates from the spring. The block descends a ramp and has a velocity $v_{2} = 2.1 \mathrm {~m} / \mathrm { s }$ at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.29. The velocity of the block is $v_{3} = 1.4 \mathrm {~m} / \mathrm { s }$ at C. The block moves on to D, where it stops. How much work is done by friction between points B and C?

• A) -1.8 J
• B) -3.6 J
• C) -14 J
• D) -6.4 J
• E) -7.0 J

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Definitions:

Caster

The angle of the steering axis in a vehicle, which affects stability, steering effort, and cornering behavior.

Zero Toe

A wheel alignment condition where the front of the wheels are parallel to each other, neither pointing towards nor away from the vehicle.

Rear Toe

The angle at which the rear wheels of a vehicle are oriented in relation to its longitudinal axis, affecting stability and cornering.

Thrust Angle

The orientation of a vehicle's rear wheels and axles in relation to the centerline of the vehicle, important for proper alignment.