Answer:
5.90 ft/s^2
Explanation:
There are mixed units in this question....convert everything to miles or feet
and hr to s
28 mi / hr = 41.066 ft/s
Displacement = vo t + 1/2 at^2
599 = 41.066 (8.9) + 1/2 a (8.9^2)
solve for a = ~ 5.90 ft/s^2
<span>17%
Any object that is floating will display the volume of fluid that matches the mass of the object that's floating. So if the object is 100% as dense as the fluid, it will just barely sink, if it's 50% as dense as the fluid, 50% will be submerged, etc. So let's see what percent of mercury's density is concrete.
2.3x10^3 / 13.6x10^3 = 0.169117647 = 16.9117647%
Rounding to 2 significant figures gives 17%.
So 17% of a piece of concrete will be submerged in mercury when it's floating in mercury.</span>
Answer:
A and D
Explanation:
Acceleration is the active change in speed, increasing or decreasing.
Answer:
(a) Q = 142.67 W
(b) Basal Metabolic Rate = 178.33 W
Explanation:
(a)
We can find the heat radiated by the person by using Stefan-Boltzman's law:
where,
Q = heat radiated per second = ?
σ = Stefan-Boltzman Constant = 5.6703 x 10⁻⁸ W/m².k⁴
A = Surface Area = 2 m²
T = Temperature of Skin = 30° C + 273 = 303 k
Ts = Temperature of room = 18° C +273 = 291 k
Therefore,
![Q = (5.6703\ x\ 10^{-8}\ W/m^2.k^4)(2\ m^2)[(303\ k)^4-(291\ k)^4]](https://tex.z-dn.net/?f=Q%20%3D%20%285.6703%5C%20x%5C%2010%5E%7B-8%7D%5C%20W%2Fm%5E2.k%5E4%29%282%5C%20m%5E2%29%5B%28303%5C%20k%29%5E4-%28291%5C%20k%29%5E4%5D)
<u></u>
<u>Q = 142.67 W</u>
<u></u>
(b)
Since the heat calculated in part (a) is 80 percent of basal metabolic rate. Therefore,
<u>Basal Metabolic Rate = 178.33 W</u>
