Compute the power transferred from a power amplifier
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.
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Calculate the power transferred from the preamplifier to a power amplifier if the voltage is 1.5 volts and the input impedance of the power amplifier is 50,000 ohms.
The lowest temperature that has been achieved is about 1 × 10-6 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cooling.
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.?
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
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