Answer:carbon-14 levels in the atmosphere
Explanation:
When carrying out radiocarbon dating, the level of carbon-14 in a sample is compared with the level of carbon 14 in the atmosphere because, objects exchange carbon-14 with the atmosphere.
Comparison of the activities of carbon-14 in the atmosphere and in the sample gives the age of the sample since the half-life of carbon-14 is a constant.
1. when the ball is just starting to fall, it has high potential but low kinetic energy. when it hits the floor, it has high kinetic but low potential energy
2. heat energy
3. reflective-transparent would be best, as they can reflect some light while let other light through, reflective-opaque would be useless in any circumstances because no light at all would be able to get through
Is there multiple choice answers
Explanation:
The given data is as follows.
, 
Area of the flat plate is 2 × 4 = 8 
.
Average convection heat transfer coefficient 
= 
= 
.
Hence, formula to calculate heat transfer through convection from air to the water is given as follows.
q = 
= ![60 W/m^{2} ^{o}C} \times 8 m^{2} \times [(80 - 30)]^{o}C](https://tex.z-dn.net/?f=60%20W%2Fm%5E%7B2%7D%20%5E%7Bo%7DC%7D%20%5Ctimes%208%20m%5E%7B2%7D%20%5Ctimes%20%5B%2880%20-%2030%29%5D%5E%7Bo%7DC)
= 24000 W
or, = 24 kW
Hence, the direction of heat flow is from air to the surface.
Thus, we can conclude that transfer of heat is 24 kW.
The amount of grams the student gained is 997.9 grams
<h3>Data obtained from the question</h3>
From the question given above, the following data were obtained:
- Mass (in lb) = 2.2 lb
- Mass (in grams) =?
<h3>How to convert 2.2 lb to grams</h3>
The mass gained in grams can be obtained by simply converting 2.2 lb to grams. This is illustrated below:
1 lb = 453.592 grams
Therefore,
2.2 lb = (2.2 lb × 453.592 grams) / 1 lb
2.2 lb = 997.9 grams
Thus, the number of grams the student gained is 997.9 grams
Learn more about conversion:
brainly.com/question/23393963
#SPJ1
