A block weighing 1900 lb slides on a flat surface with an initial velocity of 80 ft/s. The coefficient of friction between the block and the surface is 0.6. Determine: a.) The friction force causing the block to slow. b.) The distance the block travels before slowing to a stop. c.) The time it takes for the block to come to rest. d.) The amount of work done to stop the block. e.) The initial kinetic energy of the block.

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

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.)