The department of defense is testing out a new weapon which fires out a spinning ring (see the “chakram” from the Indian subcontinent). The rings that this weapon fires are approximately 20cm in inner diameter and 30cm in outer diameter and have a mass of 300 g. When fired, they rotate at 3000 revolutions per minute (about the axis of symmetry) and travel at a speed of 300 m/s. (a) What is the moment of inertia of the ring? Hint: Additivity of moment of inertia can be rewritten as subtractivity. Consider the ring as a solid disk minus a smaller solid disk!
(b) What is the kinetic energy of the disk after it has been launched?

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

answer; how far out of place which the object finished relative to the starting location;

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft