At the metal -casting company where you work, you must set up conveyor system to move castings from the furnace to the heat treatment area 55 yards away. The casting cool at the rate of 0.3F (degrees Fahrenheit )per second and must not be allowed to cool more than 7f before being heat treated. what is the minimum speed, in feet per second, that the conveyor must move?

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?