Adisk of radius 12 cm, initially at rest, begins rotating about its axis
, begins rotating about its axis with a constant
angular acceleration of 3 rad s-2 in 5 s. determine
a) the angular velocity of the disk
b) the tangential and centripetal accelerations of a point on the perimeter of the disk
c) the number of revolutions were made by the disk in those 5 s
d) write the relation between radial acceleration and linear velocity

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)