Questions are from Fitzpatrick - 25a) Q18 and 29
Q18
Two straight roads meet at an angle of 60 degrees. A starts from the intersection and travels along one road at 40km/hr. One hour laater B starts from the intersection and travels along the other road at 50km/hr. At what rate is the distance between them changing 3 hours after A starts
Q29
b) A spherical ball of radius 24mm is immersed in an acid bath and its volume decreases at a rate equal to 3 imes its surface area at that time. Find the time taken for the radiums AND the volume to be reduced to 1/8 of its original size
Q18
Two straight roads meet at an angle of 60 degrees. A starts from the intersection and travels along one road at 40km/hr. One hour laater B starts from the intersection and travels along the other road at 50km/hr. At what rate is the distance between them changing 3 hours after A starts
Q29
b) A spherical ball of radius 24mm is immersed in an acid bath and its volume decreases at a rate equal to 3 imes its surface area at that time. Find the time taken for the radiums AND the volume to be reduced to 1/8 of its original size