# Engineering Mechanics - Planar Kinematics of a Rigid Body (PKRB)

### Exercise :: Planar Kinematics of a Rigid Body (PKRB) - General Questions

• Planar Kinematics of a Rigid Body (PKRB) - General Questions
21.

Gear C is rotating with a constant angular velocity of c = 3 rad/s. Determine the acceleration of the piston A and the angular acceleration of rod AB at the instant = 90°. Set rc = 0.2 ft and rd = 0.3 ft.

 A. aA = 5.88 ft/s2 6, "AB = 4.00 rad/s2 B. aA = 5.88 ft/s2 7, "AB = 4.00 rad/s2 C. aA = 0.245 ft/s2 6, "AB = 0.816 rad/s2 D. aA = 0.245 ft/s2 7, "AB = 0.816 rad/s2

Explanation:

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22.

The automobile with wheels 2.5 ft in diameter is traveling in a straight path at a rate of 60 ft/s. If no slipping occurs, determine the angular velocity of one of the rear wheels and the velocity of the fastest moving point on the wheel.

 A. = 48 rad/s, vmax = 84.9 ft/s B. = 24 rad/s, vmax = 84.9 ft/s C. = 48 rad/s, vmax = 120.0 ft/s D. = 24 rad/s, vmax = 120.0 ft/s

Explanation:

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23.

If the rim of the wheel and its hub maintain contact with the three stationary tracks as the wheel rolls, it is neccessary that slipping occurs at the hub A if no slipping occurs at B. Under these conditions, what is the speed at A if the wheel has an angular velocity ?

 A. vA = (r2-r1) B. vA = r1 C. vA = (r2-r1) D. vA = r1