Determine tube thickness which used for shearing stress
A shaft consisting of a steel tube of 50 mm outer diameter needs to transmit 100 kW of power while rotating at a frequency of 20 Hz. Determine the tube thickness which should be used if the shearing stress can't exceed 60 MPa.
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An office worker claims that a cup of cold coffee on his table warmed up to 80°C by picking up energy from the surrounding air, which is at 25°C. Is there any truth to his claim? Does this process violate any thermodynamic laws?
A 150-lbm astronaut took his bathroom scale (aspring scale) and a beam scale (compares masses) to themoon where the local gravity is g 5.48 ft/s2. Determine how much he will weigh (a) on the spring scale and (b) onthe beam scale.?
Calculate the power transferred from a power amplifier to a loudspeaker if the amplifier output voltage is 10 volts and the speaker impedance is 8 ohms.
The same test is used in another country, and it is found that 25% of a sample population tests positive. If we assume this sample is representative, what fraction of the population has the disease?
A shaft consisting of a steel tube of 50 mm outer diameter needs to transmit 100 kW of power while rotating at a frequency of 20 Hz.
In a survey of undergraduate library usage, it was found that 76% of seniors, 59% of juniors, 50% of sophomores, and 28% of freshmen use the library frequently. Suppose that 17% of the undergraduates are seniors while the corresponding percentages
The projection lens in a certain slide projector is a single thin lens. A slide 24.5 mm high is to be projected so that its image fills a screen 1.89 m high. The slide-to-screen distance is 2.98 m. (a) Determine the focal length of the projection
An object having a mass of 8.0 g and a charge of 10.0 x 10-5 C is placed in a uniform electric field E where Ex = 2.00 x 103 N/C, Ey = -500 N/C, and Ez = 200 N/C. If the object is released from rest at the origin, what will be its coordinates afte
In a tire factor, the quality control inspector examines a randomly chosen sample of 16 tires. When more than one defective tire is found, production is halted, the existing tires are recycled, and production is then resumed.
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