1. A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What's the efficiency of the machine? A. 92 percent B. 94 percent C. 97 percent D. 96 percent
A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. [ The efficiency of the machine is 94%. Solution: Efficiency = (output power) / (input power) = (3,760 joule/sec) / (4,000 joule/sec) = 3,760 / 4,000 = 0.94 = 94%. ]
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15. If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the body?
Weegy: If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, the average velocity of the body is 21.5 m/s. Solution: ((13+30)/2) m/s = 21.5 m/s. (More)
Which one of the following substances is a liquid fuel used in rocket engines? A. Liquid oxygen B. Ammonia C. Sodium nitrate D. Potassium perchlorate
Weegy: Liquid Oxygen is a liquid fuel used in rocket engines. (More)
Updated 4/17/2019 5:55:45 PM
3. Which of the following statements is true of sound transmission through various mediums? A. Elastic solids prevent sound from being transmitted better than liquids. B. Gases conduct sound better than liquids. C. Sound insulators prevent sound from being transmitted better than elastic solids. D. Inelastic materials conduct sound better than elastic solids.
Weegy: The following statement is true of sound transmission through various mediums: Sound insulators prevent sound from being transmitted better than elastic solids. (More)
Updated 95 days ago|7/25/2020 12:49:58 PM
4. Dan's plant will require two shifts of skilled workers, seven days a week. As he does his research, he will pay particular attention to A. his target market. B. performance measures. C. regulatory restrictions. D. the labor market.
Weegy: Dan's plant will require two shifts of skilled workers, seven days a week. As he does his research, he will pay particular attention to the labor market. (More)
Updated 5/7/2019 11:50:38 AM
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