4. The US Navy has operated a 76 Hz ELF radio transmitter to communicate with submarines....

4. The US Navy has operated a 76 Hz ELF radio transmitter to communicate with submarines. Find the wavelength of the radio wave in km. The distance from New York to Los Angeles is 3,944 km. How does the wavelength compare with this distance? (5 pts)

5. To image individual atoms in crystals using electromagnetic waves, you typically want the wavelength of the wave to equal the atomic spacing between atoms; this spacing is about 0.3×10-9 m for many crystals. What would be the frequency of the EM wave needed to image atoms in the crystal? (4 pts)
Would you characterize the wave as (a) visible light, (b) ultra-violet light, (c) x-ray, or (d) gamma-ray? (1 pt)

Expert Solution

genius_generous answered 2 years ago

The US Navy is interested in acquiring a new communications relay for its submarines. Manufacturers tested...

The US Navy is interested in acquiring a new communications relay for its submarines. Manufacturers tested 50 units and found the mean time between failures to be 2607 minutes, and the sample standard deviation to be 675. Find a 95% CI for the mean time between failures. (Assume the sample comes from a normal population.)

1. The U.S. Navy has long proposed the construction of extremely low-frequency (ELF waves) communications systems;...

1. The U.S. Navy has long proposed the construction of extremely low-frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines. Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 91 Hz. km = 2. What are the wavelength ranges for the following? (a) the AM radio band (540-1600 kHz) m (maximum wavelength) m (minimum wavelength) (b) the the FM radio band (88-108 MHz) m (maximum wavelength) m (minimum...

3.) The US navy has done a lot of research on the optimal time for a...

3.) The US navy has done a lot of research on the optimal time for a scuba diver to be on the bottom of the ocean. The Navy defines the optimal time to be the time at each depth for the best balance between length of work period and decompression time after surfacing. Let x = depth of dive in meters and y = optimal time in hours. A random sample of divers gave the following data (based on information...

The US navy has done a lot of research on the optimal time for a scuba...

The US navy has done a lot of research on the optimal time for a scuba diver to be on the bottom of the ocean. The Navy defines the optimal time to be the time at each depth for the best balance between length of work period and decompression time after surfacing. Let x = depth of dive in meters and y = optimal time in hours. A random sample of divers gave the following data (based on information taken from Medical Physiology...

The weak acid HZ has a Ka of 2.55 x 10-4. Calculate the pH of a...

The weak acid HZ has a Ka of 2.55 x 10-4. Calculate the pH of a 0.235 M solution.

A 37.3 kW 4 pole 50 Hz induction machine has a friction windage torque of 22...

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A 3 phase 460 V, 60 Hz, 4 pole, delta connected induction motor has the following equivalent circuit parameters. Rs = 0.42 Ω, Rr = 0.23 Ω, Xs = Xr = 0.82 Ω. Xm = 22 Ω. The no load loss = 60 W and may be assumed constant. The rotor speed is 1750 rpm. Use the approximate equivalent circuit ( i.e. the Xm branch is at the very left of the circuit) determine the following a. the synchronous speed...

A Y- connected, 460- V, 1710- rpm, 60- Hz, 4- pole squirrel cage induction motor has...

A Y- connected, 460- V, 1710- rpm, 60- Hz, 4- pole squirrel cage induction motor has a rotor current at starting 6 times the rotor current at full load. Calculate: a. The starting torque as percent of full load torque. b. The slip and speed at which the motor develops maximum torque. c. The maximum torque developed b the motor as percent of its full load value.

A 440 V 4-pole 3 phase 50 Hz slip ring induction motor has its stator winding...

A 440 V 4-pole 3 phase 50 Hz slip ring induction motor has its stator winding mesh connected and its rotor winding star connected. The standstill voltage measured between slip rings with the rotor open –circuited is 218 V. the stator resistance per phase is 0.6Ω and the stator reactance per phase is 3Ω. The rotor resistance per phase is 0.05Ω and the rotor reactance per phase is 0.25Ω. Calculate the maximum torque and the slip at which it occurs....

Income inequality has grown dramatically in the US over the past 4 decades. Is that a...

Income inequality has grown dramatically in the US over the past 4 decades. Is that a bad thing? Why/why not? What percentage of the US work force has enjoyed improved standards of living over the past 4 decades? Who has received the productivity and income gains generated by the US economy over that period of time? Should public policy be changed to encourage greater or lesser income inequality? What changes would you advocate?

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