1. They have evolved their leaves into spikes for minimum water loss through transpiration.
2. They have a waxy layer for minimum water loss.
3. They have thick walls for minimum water loss.
4. They can take water from atmosphere.
5. They change the photo energy from Sun into an intermediate stage and store it, so that they can make food even in night.
Force , F = ma
F = m(v - u)/t
Where m = mass in kg, v= final velocity in m/s, u = initial velocity in m/s
t = time, Force is in Newton.
m= 1.2*10³ kg, u = 10 m/s, v = 20 m/s, t = 5s
F = 1.2*10³(20 - 10)/5
F = 2.4*10³ N = 2400 N
Answer:
Resistance of the iron rod, R = 0.000077 ohms
Explanation:
It is given that,
Area of iron rod, ![A=10\ cm\times 0.5\ cm=5\ cm^2 = 0.0005\ m^2](https://tex.z-dn.net/?f=A%3D10%5C%20cm%5Ctimes%200.5%5C%20cm%3D5%5C%20cm%5E2%20%3D%200.0005%5C%20m%5E2)
Length of the rod, L = 35 cm = 0.35 m
Resistivity of Iron, ![\rho=11\times 10^{-8}\ \Omega-m](https://tex.z-dn.net/?f=%5Crho%3D11%5Ctimes%2010%5E%7B-8%7D%5C%20%5COmega-m)
We need to find the resistance of the iron rod. It is given by :
![R=\rho\dfrac{L}{A}](https://tex.z-dn.net/?f=R%3D%5Crho%5Cdfrac%7BL%7D%7BA%7D)
![R=11\times 10^{-8}\times \dfrac{0.35\ m}{0.0005\ m^2}](https://tex.z-dn.net/?f=R%3D11%5Ctimes%2010%5E%7B-8%7D%5Ctimes%20%5Cdfrac%7B0.35%5C%20m%7D%7B0.0005%5C%20m%5E2%7D)
![R=0.000077 \Omega](https://tex.z-dn.net/?f=R%3D0.000077%20%5COmega)
So, the resistance of the rod is 0.000077 ohms. Hence, this is the required solution.
Incompressible. Compressibility is determine by the amount of space between particles in each state.