Almost all of the energy on Earth comes from the Sun
The energy in fossil fuels originally came from the Sun
Plants convert the energy
Explanation:
The sun is the ultimate source of energy on earth and even the whole of the solar system. The sun drives and powers all external processes on earth. It produces its energy from the nuclear fusion of lighter nuclei into heavier ones.
- Almost all of the energy on earth comes from the sun. A few component of the energy on the surface comes from the internal heat engine.
- The energy of fossil fuels originally came from the sun. This is because, plants stores the energy in the process of photosynthesis. When they die and the energy is not released, the energy is stored as fossil fuels.
- Plants in the process of photosynthesis converts the energy. Here green plants combines carbon dioxide and water in the presence of sunlight.
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Answer:
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5. between the stone and the ground
for a stone at rest on the ground, we have two forces acting on the stone. first is the force on the stone by the earth due to gravity of earth. second is the force applied by the ground in upward direction to balance the force of gravity on the stone.
so first interaction is between earth and stone : earth pulls stone towards it and stone pulls earth towards it by same amount of force.
second interaction is between stone and ground : ground push the stone in upward direction and stone push the ground in down direction by same amount of force.
hence the correct choice is
5. between the stone and the ground
Answer:
13.12°
Explanation:
Parameters given:
Magnetic field strength, B = 0.350 T
Current in the wire, I = 3.5 A
Force per unit length, F/L = 0.278 N/m
The force on a wire due to the presence of a magnetic field is given as:
F = I*L*B*sinФ
where Ф = angle between the magnetic field and current
The force per unit length, F/L, will be:
F/L = I*B*sinФ
0.278 = 3.5 * 0.35 * sinФ
=> sinФ = ![\frac{0.278}{3.5 * 0.35}](https://tex.z-dn.net/?f=%5Cfrac%7B0.278%7D%7B3.5%20%2A%200.35%7D)
sinФ = 0.227
Ф = ![sin^{-1}(0.227)](https://tex.z-dn.net/?f=sin%5E%7B-1%7D%280.227%29)
Ф = 13.12°
The angle between the magnetic field and the current is 13.12°.
Answer:![0.345 m/s^2](https://tex.z-dn.net/?f=0.345%20m%2Fs%5E2)
Explanation:
Given
mass of skier ![m=63.9 kg](https://tex.z-dn.net/?f=m%3D63.9%20kg%20)
Force ![F=125 N](https://tex.z-dn.net/?f=F%3D125%20N)
inclination of Force with horizontal ![\theta =31.5](https://tex.z-dn.net/?f=%5Ctheta%20%3D31.5)
Water force ![F_w=84.5 N](https://tex.z-dn.net/?f=F_w%3D84.5%20N)
Resolving Forces
![F\cos (31.5)-84.5=m\cdot a](https://tex.z-dn.net/?f=F%5Ccos%20%2831.5%29-84.5%3Dm%5Ccdot%20a)
where a=acceleration of skier
![125\cos (31.5)-84.5=63.9\times a](https://tex.z-dn.net/?f=125%5Ccos%20%2831.5%29-84.5%3D63.9%5Ctimes%20a)
![a=\frac{106.58-84.5}{63.9}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B106.58-84.5%7D%7B63.9%7D)
![a=0.345 m/s^2](https://tex.z-dn.net/?f=a%3D0.345%20m%2Fs%5E2)
This acceleration is in x direction therefore ![a_x=a=0.345 m/s^2](https://tex.z-dn.net/?f=a_x%3Da%3D0.345%20m%2Fs%5E2)