<span><u><em>
As you may think that Mercury is he closest planet to the sun,tho its not hotter than Venus.Venus temperature.The surface is </em></u></span><span><u><em>
462 °C or 863 °F.</em></u></span>
Answer:
ΔQ = - 762 J (Negative Sign shows heat transfer from the system)
Explanation:
The heat transferred to or from the system can be given by using First law of Thermodynamics as follows:
where,
ΔQ = Heat Transferred to or from system = ?
ΔU = Change in Internal Energy of System = Change in Thermal Energy
ΔU = - 240 J (negative sign due to decrease in energy)
W = Work done on system = -522 J (negative sign due to work done "on" system)
Therefore,
<u>ΔQ = - 762 J (Negative Sign shows heat transfer from the system)</u>
This sounds pretty easy, in fact. The orbital motion can be assumed to be circular and with constant speed. Then, the period is the time to do one revolution. The distance is the length of a revolution. That is 2*pi*R, where R is the distance between the Moon and the Earth (the respective centers to be precise). In summary, it's like a simple motion with constant speed:
v = 2*pi*R/T,
you have R in m and T is days, which multiplied by 86,400 s/day gives T in seconds.
Then v = 2*pi*3.84*10^8/(27.3*86,400) = 1,022.9 m/s ~ 1 km/s (about 3 times the speed of sound :)
For the Earth around the Sun, it would be v = 2*pi*149.5*10^9/(365*86,400)~ 29.8 km/s!
I know it's not in the problem, but it's interesting to know how fast the Earth moves around the Sun! And yet we do not feel it (that's one of the reasons some ancient people thought crazy the Earth not being at the center, there would be such strong winds!)
Movement of minerals in plant
Explanation:
In Biology, Active transport means Movement of molecules from lower concentration to Higher concentration through a membranous substance.
It is clearly shown in transportation of minerals from root hairs to root cells.
From root hairs( Lower concentration) minerals are transported to other parts of plant ( Higher concentration, Active transport takes place.
It is clearly evident that in this natural process active transport of minerals takes place effectively through root hairs to various parts of plant.
