Question

In: Physics

A mechanic is trying to tune the engines in a twin engine plane much like a...

A mechanic is trying to tune the engines in a twin engine plane much like a string instrument can be tuned by listening to the beat frequency when two notes are played simultaneously. The mechanic has one engine running perfectly at a desired 4500 rpm and is trying to adjust the other to the same speed. He slowly detunes the second engine from a larger rpm until he first discerns a beat frequency amplitude that occurs once every 12 s. To what rpm is the second engine tuned? The answer is 4505 rpm

Solutions

Expert Solution

Consider the frequency of larger rpm as F
4500 rpm = 4500/60 = 75 Hz
Beat frequency, f = 1/12 = 0.0833 Hz

F - 75 = 0.0833
F = 75 + 0.833
= 75.833 Hz
= 75.833 x 60 rpm
= 4505 rpm

genius_generous answered 2 years ago
Next > < Previous

Related Solutions

Why have gas turbine engines almost completely replaced piston engines on new corporate-sized twin-engine aircraft?
Why have gas turbine engines almost completely replaced piston engines on new corporate-sized twin-engine aircraft?
1. Real heat engines, like the gasoline engine in a car, always have some friction between...
1. Real heat engines, like the gasoline engine in a car, always have some friction between their moving parts, although lubricants keep the friction to a minimum. Would a heat engine with completely frictionless parts be 100% efficient? Why or why not? Does the answer depend on whether or not the engine runs on the Carnot cycle? Again, why or why not? 2.Some critics of biological evolution claim that it violates the second law of thermo- dynamics, since evolution involves...
Two musicians, ?1M1 and ?2M2, are trying to play music together. To tune their instruments, they...
Two musicians, ?1M1 and ?2M2, are trying to play music together. To tune their instruments, they both play at the same time and produce notes at different frequencies. Musician ?1M1 produces a note with frequency ?1=309.5 Hzf1=309.5 Hz while musician ?2M2 produces a note with frequency ?2=281.8 Hzf2=281.8 Hz. Assume the speed of sound in air is 343 m/s343 m/s. Part 1) Unsatisfied with their different notes, musician ?2M2 decides to remain stationary while musician ?1M1 travels towards them. If...
the probability that an engine will not start is .04. a rocket has four independent engines....
the probability that an engine will not start is .04. a rocket has four independent engines. what is the probability that at least one of the engines does not start?
In an engine cycle like the one shown in Figure
In an engine cycle like the one shown in Figure    heat is added over a range of temperatures. Explain why even if it were run reversibly, its efficiency would be less than the Carnot limit defined by the high- and low-temperature set points and shown in the figure ( ηC = T4-T2)/T4. Is this in itself a disadvantage of such a cycle?    
1.An airoplane with four engines is able to fly if at least one engine is functioning...
1.An airoplane with four engines is able to fly if at least one engine is functioning on each wing. Let Ai be the event that the ith engine is working, i = 1, 2, 3, 4, where engines 1 and 2 are on the left wing and engines 3 and 4 are on the right wing. Let A be the event that the airoplane is able to fly. Express A in terms of A1, . . . , A4, using...
The Engine Division provides engines for the Tractor Division of a company. The standard unit costs...
The Engine Division provides engines for the Tractor Division of a company. The standard unit costs for Engine Division are: Direct materials $ 600 Direct labor 1,200 Variable overhead 300 Fixed overhead 150 Market price per unit 2,730 The engine department has excess capacity. What is the best transfer price to avoid transfer price problems? a. $300 b. $900 c. $2,100 d. $1,350
A company produces small engines for regular cars, and it decides to produce a larger engine...
A company produces small engines for regular cars, and it decides to produce a larger engine that will be used for trucks. As the company has never produced this kind of engine, a specific piston ring size needs to be purchased in order to produce the new engine. Assume that you are responsible for the procurement of that piston ring from three different suppliers. The inside diameter length of the piston has been determined as a quality characteristic with a...
A manufacturer of small engines concerned with the issue of noise pollution developed a new engine...
A manufacturer of small engines concerned with the issue of noise pollution developed a new engine that would, it was hoped, be quieter than the standard model. Forty-one of the new models were tested for noise level and compared with 65 of the standard models. The results are given below with noise measured in decibels. (The higher the decibel is, the higher the noise level is ). Assume that the noise levels of both the standard and the new model...
A company produces small engines for regular cars, and it decides to produce a larger engine...
A company produces small engines for regular cars, and it decides to produce a larger engine that will be used for trucks. As the company has never produced this kind of engine, a specific piston ring size needs to be purchased in order to produce the new engine. Assume that you are responsible for the procurement of that piston ring from three different suppliers. The inside diameter length of the piston has been determined as a quality characteristic with a...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT