A truck skids to stop 60 m after the application of the brakes while travelling at 90 km/hr. What is the acceleration in m/sec2?

In a CD player, a CD rotates from rest up to angular speed of   in a time interval, . It is necessary to calculate:

1. What is the angular acceleration of the disc, assuming the angular acceleration is uniform?

1. The angular displacement and the number of revolutions  done by the CD while coming up to speed?

1. If the radius of the disc is , what are the magnitudes of tangential speed and acceleration of a dust particle placed on the rim of the disc when

The 20-kg slender rod is pinned at O. For the moment the cable attached at the

end A suddenly breaks, you are asked to

(a) provide forces (free body diagram) and motion analysis

(b) determine the acceleration of the end A

(c) find out the reaction at the pin support.

1.  A 4ft high, 3 ft diameter cylindrical water tank whose top is open to the atmosphere is initially filled with water. Now the discharge plug near the bottom of the tank is pulled out, and a water jet whose diameter is 0.5 in streams out. The average velocity of the jet is approximated as v= , where h is the height of wave in the tank measured from the center of the hole (a variable) and g is the gravitational acceleration. Estimate the time taken for the water level in the tank to drop to 2 ft from the bottom. And if the jet diameter increased to 0.6 in, then compare the time taken to drop same water level in tank.