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>
Answer:
Explanation:
Let fuel is released at the rate of dm / dt where m is mass of the fuel
thrust created on rocket
= d ( mv ) / dt
= v dm / dt
this is equal to force created on the rocket
= 220 dv / dt
so applying newton's law
v dm / dt = 220 dv / dt
v dm = 220 dv
dv / v = dm / 220
integrating on both sides
∫ dv / v = ∫ dm / 220
lnv = ( m₂ - m₁ ) / 220
ln4000 - ln 2500 = ( m₂ - m₁ ) / 220
( m₂ - m₁ ) = 220 x ( ln4000 - ln 2500 )
( m₂ - m₁ ) = 220 x ( 8.29 - 7.82 )
= 103.4 kg .
you can find it using the equation: potential energy=mass*gravitational acceleration*height.
energy=50kg*9.8N/kg*40m=19600Nm=19600J or 19.6kJ
Sometimes they use 10 instead of 9.8 for the g constant.
Rember to make me Brainliest!!!
Answer:
Explanation:
The total force exerted by the man on the chair is equal to his weight:
where m=95.0 kg is the man's mass and g=9.8 m/s^2. Substituting,
Since there are 4 legs, we can assume that the force is equally distributed over the 4 legs; so the force supported by each leg is
The radius of each leg is , so the area of each leg is
And the pressure exerted on each leg is equal to the ratio between the force supported by each leg and the area:
Effort force and Resistance force