Astring is wrapped around a uniform disk of mass m = 1.2kg and radius r = 0.11m. attached to the disk are four low-mass rods of radius b = 0.14m, each with a small mass m = 0.4kg at the end. the device is initially in rest on a nearly frictionless surface. they you pull the string with a constant force f = 21n for a time of 0.2s. now what is the angular speed of the apparatus?

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?