A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 8.70 rev/s; 40.0 revolutions later, its angular speed is 21.0 rev/s. Calculate (a) the angular acceleration (rev/s2), (b) the time required to complete the 40.0 revolutions, (c) the time required to reach the 8.70 rev/s angular speed, and (d) the number of revolutions from rest until the time the disk reaches the 8.70 rev/s angular speed. (a) Number Enter your answer in accordance to item (a) of the question statementEntry field with correct answer 4.566375004 Unit Choose the answer from the menu in accordance to item (a) of the question statementEntry field with correct answer rev/s^2 (b) Number Enter your answer in accordance to item (b) of the question statementEntry field with correct answer 2.693602693 Unit Choose the answer from the menu in accordance to item (b) of the question statementEntry field with correct answer s (c) Number Enter your answer in accordance to item (c) of the question statementEntry field with correct answer 1.905231172 Unit Choose the answer from the menu in accordance to item (c) of the question statementEntry field with correct answer s (d) Number Enter your answer in accordance to item (d) of the question statementEntry field with correct answer 8.287755598 Unit Choose the answer from the menu in accordance to item (d) of the question statementEntry field with correct answer rev