Answer: 3 m/s
Explanation:
The average velocity is simply the change in displacement over the specified time interval. I’m this case, we have a total of four intervals,which represent 4 seconds. Dividing 12 m by 4s gives us 3 m/s
Answer:
Using the new cylinder the heat rate between the reservoirs would be 50 W
Explanation:
- Conduction could be described by the Law of Fourierin the form: where is the rate of heat transferred by conduction, is the thermal conductivity of the material, and are the temperatures of each heat deposit, is the cross area to the flow of heat, and is the distance that the flow of heat has to go.
- For the original cylinder the Fourier's law would be: , and if , then the expression would be: where is the diameter of the original cylinder, and is the length of the original cylinder.
- For the new cylinder, in the same fashion that for the first, Fourier's Law would be: ,where is the heat rate in the second case, and are the new diameter and length.
- But, and , substituting in the expression for : .
- Rearranging: .
- In the last declaration of , it could be noted that the expressión inside the parenthesis is actually , then: .
- <u>It should be noted, that the temperatures in the hot and cold reservoirs never change.</u>
The net force on the sled is 300 N
Explanation:
First of all, we start by finding the acceleration of the bobsled, by using the suvat equation:
where:
v = 6.0 m/s is the final velocity of the sled
u = 0 is the initial velocity
a is the acceleration
s = 4.5 m is the displacement of the sled
Solving for a, we find
Now we can find the net force on the sled by using Newton's second law:
F = ma
where
F is the net force
m = 75 kg is the mass of the sled
is the acceleration
Solving the equation, we find the net force:
Learn more about acceleration and Newton laws here:
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Ok so it would be late and the relative velocity would be 190 m/s because 200 m/s - 10 m/s is 190 m/s. Hope this helps.
Answer: 83%
Explanation:
Efficiency of the process = work output/work input × 100%
Work input is the energy used up in the process = 720,000Joules
Work output = Force × distance
= (3000×10)× 20
= 600000 Joules
Efficiency= 600000/720000 × 100
= 0.83×100
= 83%