In an amusement park, wireless devices are used to post the queue length and wait time for each of the rides. Can you think of an infrastructure that could enable patrons to do online interaction? Assume appropriate requirements and a potential solution.
You do need some software support. Can you think and
outline how you would go about acquiring this? Explain.
Yes, software support would definitely be needed in this system.
(a) The nodes in the network need some kind of software to pose queries to the network and also to see the query replies. It could be in the form of a Java based user interface or it could be using SQL.
(b) In addition, the user interface would also allow the user to obtain the status of the other users in the network for example their current location. This would help them in making their next decision.
(c) Additionally, the system manager also needs to maintain a kind of database for all the rides in the network. There would be functions to perform specific tasks. Certain parameters such as the average wait time per ride, the queue length could be stored in this database.
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In a cooling system, the heat absorbed by the refrigerant is transferred to the cooler outdoor air in a heat exchanger known as a(n) _____.
a. compressor b. condenser c. evaporator d. expansion device
Biomass is the product of cellular respiration
Indicate whether the statement is true or false.
A physicist wants to estimate the rate of emissions of alpha particles from a certain source. He makes two counts. First, he measures the background rate by counting the number of particles in 100 seconds in the absence of the source. He counts 36 background emissions. Then, with the source present, he counts 324 emissions in 100 seconds. This represents the sum of source emissions plus background emissions.
a. Estimate the background rate, in emissions per second, and find the uncertainty in the estimate. b. Estimate the sum of the source plus background rate, in emissions per second, and find the uncertainty in the estimate. c. Estimate the rate of source emissions in particles per second, and find the uncertainty in the estimate. d. Which will provide the smaller uncertainty in estimating the rate of emissions from the source: (1) counting the background only for 150 seconds and the background plus the source for 150 seconds, or (2) counting the background for 100 seconds and the source plus the background for 200 seconds? Compute the uncertainty in each case. e. Is it possible to reduce the uncertainty to 0.03 particles per second if the background rate is measured for only 100 seconds? If so, for how long must the source plus background be measured? If not, explain why not.
When brazing is finished, which of the following valves should be shut off first?
A) Oxygen valve on the tank regulator B) Acetylene valve on the tank regulator C) Acetylene valve on the torch handle D) Oxygen valve on the torch handle