A tank truck for washing down streets has a total weight of 20,000 lb when its tank is full. With the spray turned on, 80 lb of water per second issue from the nozzle with a velocity of 60 ft/sec relative to the truck at the 30° angle shown. If the truck is to accelerate at the rate of 2 ft/sec² when starting on a level road, determine the required tractive force P between the tires and the road when (a) the spray is turned on and (b) the spray is turned off.

Transcribed Image Text:

a 30°