Planets are not hot enough, and that's because they lack the internal energy sources that stars have: thermonuclear fusion (They do emit a little light, mainly infrared light, but nothing compared to the sun)
Planets don't have their own light, so simply they do not emit light, this phenomena goes back to their information. When they are formed, they are much, much less hotter than the stars. In stars, fusion reaction always goes on, in which energy, as well as light is formed, so, there is light for stars to emit for a long time.
Answer:
1/f = 1/D' + 1/D
The magnification equation relates the ratio of the image distance and object distance to the ratio of the image height (h^i) and object height (h^o). The magnification equation is stated as follows:
M= H^i/H^o = D^i/D^o
protons, the electrons and neutrons change but NEVER the protons.
Answer:
Power output = 96.506 watts
Explanation:
Drag coefficient (Cd) = 0.9
V = 7.3 m/s
Air density (ρ) = 1.225 kg/m^(3)
Area (A) = 0.45 m^2
Let's find the drag force ;
Fd=(1/2)(Cd)(ρ)(A)(v^(2))
So Fd = (1/2)(0.9)(1.225)(0.45)(7.3^(2)) = 13.22N
Drag power = Drag Force x Drag velocity.
Thus drag power, = 13.22 x 7.3 = 96.506 watts
Answer:
Maximum compression= 0.25 m
Final velocities= 5 m/s
Explanation:
From the law of conservation of momentum
m1v1 + m2v2=(m1+m2)Vc where m1 is mass of block 1, m2 is mass of block 2, v1 is velocity of block 1, v2 is velocity of block 2, vc is the common velocity of the two blocks.
Substituting 2Kg for m1, 5kg for m2, 10m/s for v1, 3m/s for v2 we obtain
2Kg*10m/s + 5kg*3m/s=(2+5)Vc
7Vc=20+15
7Vc=35
Vc=35/7=5m/s
From law of conservation of energy
Final energy-Initial energy+Energy stored in spring=0
where x represent compression of spring
![0.5*1120x^{2}+0.5(2+5)*5^{2}-0.5(2*10^{2})-0.5(5*3^{2})=0](https://tex.z-dn.net/?f=0.5%2A1120x%5E%7B2%7D%2B0.5%282%2B5%29%2A5%5E%7B2%7D-0.5%282%2A10%5E%7B2%7D%29-0.5%285%2A3%5E%7B2%7D%29%3D0)
![560x^{2}+87.5-100-22.5=0](https://tex.z-dn.net/?f=560x%5E%7B2%7D%2B87.5-100-22.5%3D0)
![560x^{2}-35=0](https://tex.z-dn.net/?f=560x%5E%7B2%7D-35%3D0)
![560x^{2}=35](https://tex.z-dn.net/?f=560x%5E%7B2%7D%3D35)
![X^{2}=35/560=0.0625](https://tex.z-dn.net/?f=X%5E%7B2%7D%3D35%2F560%3D0.0625)
=0.25 m