Meter <span>per second (U.S. spelling: </span>meter<span> per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in meters divided by time in seconds. The SI unit symbols are m.</span>
Answer:
Centripetal Acceleration = 2.701 m/s²
Explanation:
Given:
Starting from rest so initial angular velocity ωi = 0 rad/s
Final angular velocity ωf= 78 rev/min =78 × 2π /60 rad/s = 8.168 rad/s
Radius of Rim =d/2 =12/6= 6 in = 6× 2.54 cm =15.24 cm = 0.1524 m
angular acceleration α = (ωf - ωi)/t = (8.168 rad/s - 0 rad/s)/2.91 s
α =2.807 rad/s²
now to find angular velocity at 1.5 s we have
ω = α × t = 2.807 rad/s² × 1.5 s = 4.210 rad/s
so centripetal acceleration ac = ω² r = (4.210 rad/s)² × 0.1524 m
ac= 2.701 m/s²
Answer:
The correct option is;
Why car engines are not perfectly efficient
Explanation:
The Second Law of Thermodynamics states that the total entropy, S, of a system combined with the entropy of its surrounding cannot be decreased, such that for an irreversible process, the entropy always increases and > , while for a reversible process the entropy is constant and
The entropy is a measure of the amount of useful work obtainable from heat (or thermal) energy
A system with a low entropy has high amounts of heat energy capable of doing work while a high entropy system can produce only a small amount of useful work from the available thermal energy
In car engines, as the parts start to move, the entropy of the system increases alongside the generated heat lost to the environment, the amount of heat available for doing work reduces and therefore, the entropy increases further and the ratio of work obtainable from a given input of heat energy reduces and therefore, the car engine is not perfectly efficient.
Explanation:
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Answer:
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy. Mechanical waves transport energy. Slightly faster than Rayleigh waves, at about 90% of the body wave velocity, and have the largest amplitude.
Explanation: