A small block with a mass of 0.08 kg is attached to a cord
passing through a hole in a
frictionless, horizontal surface
As shown in the Figure. The
block is originally revolving
at a distance of 0.90 m from the hole with a speed of 0.60 m's. The cord is then pulled from below. shortening the radius of the circle in which the block revolves to 0.30 m. At this new distance, the speed of the block is 3.00 ms. The average force of the hand of
the man while shortening the radius of the circle is​

Amarble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. which one has the greatest kinetic energy? the marble the bowling ball the basketball the baseball

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z