To develop this problem we will apply the concept related to heat transfer defined as the product between the transfer coefficient and the temperature difference between two spaces, that is,
Here,
h = Heat transfer coefficient
= Temperature at each point
- Interior air and inner wall:
- Outer wall to exterior air:
- Inner wall to interior air:
We can see that the magnitude of the heat fluxes in the three states are the same (The negative sign only indicates the change of direction) so the wall is in steady state conditions
Answer:
0.8 km/hr
Explanation:
Transpose the formula of speed to make distance the subject
Distance = speed × time
Also because the speed is in km/hr and the time is in seconds we need to convert the 4 seconds to hour
Thermal energy always flows spontaneously from the body that is at a higher temperature to the body that has a lower temperature.
In this case, the thermal energy flows from the hot beverage that is at the temperature t1 to the ice cube at the temperature t2 until the two reach the same temperature t3.
Where:
t1> t2 <t3.
The ice cube would emit heat if the temperature of the liquid with which it comes in contact with the smaller than that of the ice.
Hi there!
a.
The equation for centripetal acceleration is as follows:
Plug in the given values to solve:
b.
According to Newton's Second Law:
The acceleration is v²/r, so the net force is:
Multiply by the given mass:
c.
There is NO net force in the vertical direction since the object is NOT accelerating in the vertical direction (normal force and weight cancel).
Thus, the ONLY net force experienced by the object is in the horizontal direction and is EQUAL to the centripetal force.
The 1/2 value comes due to the integration of the Newton's law of motion .. like for doing work we do integrate fds vector. when we integrate it .we get it as 1/2mv^2 + constant
.