Which of the following is an obstacle to creating computer-based models for tracking a hurricane?

1. hurricanes form over water, where it is difficult to observe them.
2. most sources of data about hurricanes are anecdotal and unreliable.
3. forecasters must consider a large number of variables that affect the path of the storm.
4. all of the above

What are segments of dna that code for a particular trait. a combination of dna and proteins make up what

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

What is the speed of an object at a given moment?