Answer:
Emec = 94050 [J]
Explanation:
In order to solve this problem, we must understand that all thermal energy is converted into mechanical energy.
The thermal energy can be calculated by means of the following expression.
where:
Q = heat [J]
Cp = specific heat of water = 4186 [J/kg*°C]
m = mass = 300 [g] = 0.3 [kg]
T_final = 95 [°C]
T_initial = 20 [°C]
Now we can calculate the heat, replacing the given values:
![Q=0.3*4180*(95-20)\\Q= 94050[J]](https://tex.z-dn.net/?f=Q%3D0.3%2A4180%2A%2895-20%29%5C%5CQ%3D%2094050%5BJ%5D)
Since all this energy must come from the mechanical energy delivered by the exercise bike, and no energy is lost during the process, the mechanical energy must be equal to the thermal energy.
![Q=E_{mec}\\E_{mec}=94050[J]](https://tex.z-dn.net/?f=Q%3DE_%7Bmec%7D%5C%5CE_%7Bmec%7D%3D94050%5BJ%5D)
Answer:
McNair graduated as valedictorian of Carver High School in 1967. In 1971, he received a Bachelor of Science degree in engineering physics, magna cu.m laude, from the North Carolina Agricultural and Technical State University in Greensboro, North Carolina.
Answer:
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.
Answer: 9.09 seconds
Explanation:
Given that,
speed of sound = 330 m/s
Distance away = 3 km
(since the SI unit of distance is metres, convert 3km to metres
1km = 1000 metres
3km = (3 x 10000) = 3000 metres
Time it take for the sound to reach you = ?
Now, recall that speed is obtained by dividing distance travelled by the time taken.
i.e speed = distance / time
330 m/s = 3000 m / time
Time = 3000 m / 330 m/s
Time = 9.09 seconds
Thus, it will take 9.09 seconds for the sound to reach you.
"It propagates in the form of compression and rarefactions" is the one statement among the following choices given in the question that is true about a <span>wave produced by a doorbell. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer helps you. </span>
