Resistance is the ratio of
(voltage between two points in the circuit)
divided by
(current between the same points).
It's expressed in units of Ohms, so the correct choice is "none of the above".
Answer:
3.78075x10^6 kg x meter^2/ second^2
Explanation:
Kinetic energy K= 1/2 x mass x velocity^2
Here,
m=80 kg
R= 6.4*10^6 m
and t=24*3600=86400 s
Centripetal acceleration:
a=ω²r
=(2

/86400)^2 * 6.4*10^6
=0.034 m/s²
Answer:
_s = 37.77 m / s
Explanation:
This is an exercise of the Doppler effect that the change in the frequency of the sound due to the relative speed of the source and the observer, in this case the observer is still and the source is the one that moves closer to the observer, for which relation that describes the process is
f ’= f₀
where d ’= 530 Make
when the ambulance passes away from the observer the relationship is
f ’’ = f₀
where d ’’ = 424 beam
let's write the two expressions
f ’ (v-v_s) = fo v
f ’’ (v + v_s) = fo v
let's solve the system, subtract the two equations
v (f ’- f’ ’) - v_s (f’ + f ’’) = 0
v_s = v
the speed of sound is v = 340 m / s
let's calculate
v_s = 340
v_s = 340
)
v_s = 37.77 m / s
Answer:
The convective heat transfer coefficient of the fluid is 170.4 watts per square meter-degree Celsius.
Explanation:
The Nusselt number (
) is a dimensionless factor which compares the sensitivity of a fluid due to convection with those due to conduction:
(Eq. 1)
Where:
- Convective heat transfer coefficient, measured in watts per square meter-degree Celsius.
- Conductive heat transfer coefficient, measured in watts per meter-degree Celsius.
- Characteristic length, measured in meters.
In addition, the characteristic length of a cylinder is defined by the following formula:
(Eq. 2)
Where:
- Radius of the cylinder, measured in meters.
- Length of the cylinder, measured in meters.
If we know that
,
,
and
, then the convective heat coefficient is:
From (Eq. 2):


And by (Eq. 1):



The convective heat transfer coefficient of the fluid is 170.4 watts per square meter-degree Celsius.