Physics, 17.07.2020 01:01 inesperezferrere

Match the engines in the following list with their drawbacks. Place your answer in the blank space given. i. gunpowder engine ii. Savery engine iii. Newcomen engine iv. Watt engine a._ The boiler could not withstand the steam pressure needed to lift water beyond 6 m. b._ The engine had no mechanism to move the piston back to complete a cycle. c._ The continual reheating needed after each cooling of the engine cylinder required a tremendous amount of thermal energy. d._ This engine was large and massive and less efficient than thought possible.

Match the engines in the following list with their drawbacks. Place your answer in the blank space

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Answer from: allieallie

The correct options are;

a. ii. Savery engine The boiler could not withstand the steam pressure needed to lift water beyond 6 m.

b. i.Gunpowder engine The engine had no mechanism to move the piston back to complete a cycle

c. iii. Newcomen engine The continual reheating needed after each cooling of the engine cylinder required tremendous amount of thermal energy

d. iv. Watt engine This engine was large and massive and less efficient than thought possible

Explanation:

a. The evaporation of the water due to the effect of creating a vacuum limits the Savery's engine pressure differential to about 20 (which is approximately 6 meters) to 25 feet of suction

b. In The gunpowder engine after providing power to a mass, there is less provision to move the piston to a position to lift another mass

c. Energy from burning of fuel was needed to heat the steam cylinder (the steam and the steel wall) repeatedly which consumed a considerable energy in the Newcomen engine

d. In the Watt steam engine the increased efficiency attainable was 17.4% while the actual efficiency was about 11% with the addition of a separate condenser unit.

Answer from: Quest

i think the answer would be b

Answer from: Quest

Is a vector quantity that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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Match the engines in the following list with their drawbacks. Place your answer in the blank space g...