The correct answer is 1 and 4.
Burning of fossil fuels releases harmful gases to the atmosphere which leads to climate change. Burning of hydrogen gas releases water which has no negative effect on climate.
Burning of both fossil fuels and hydrogen takes place inside expensive fuel cells.
Fossil fuels are widely available and easy to locate whereas hydrogen is available in the combined form with other elements. Hydrogen are not found in pure form on earth.
Fossil fuels are non-renewable source of energy which means they cannot be replaced in short time.
The point of contact the path difference is zero but one of the interfering ray is reflected so the effective path difference becomes λ/2 thus the condition of minimum intensity is created in the center.
Answer:
Frequency – The frequency of a wave is the number of waves that pass a given point in a certain amount of time. Frequency is measured in units called hertz (Hz), and is defined as the number of waves per second. A wave that occurs every second has a frequency of 1 wave per second (1/s) or 1 Hz.
<span>So, if the man weight 900 newtons on Earth then that means, using F=ma, that the mass of the man is approximately 91.84 kg. This is because 900N=m(9.8m/s^2), and so it follows that 900/9.8=91.84. Using the man's found mass we then plug this into F=ma again. It follows that F=(91.84)(25.9)=2378.57N. This means that the man "weighs" 2378.57 Newtons on Jupiter, or about 2.5x as great as his weight on Earth. This makes sense, considering that 25.9/9.8 is approximately equal to 2.64.</span>
Answer:
(a) 0 (b) ![F=1.67\times 10^9\ N](https://tex.z-dn.net/?f=F%3D1.67%5Ctimes%2010%5E9%5C%20N)
Explanation:
Given that,
Mass of a supertanker, ![m=1.7\times 10^8\ kg](https://tex.z-dn.net/?f=m%3D1.7%5Ctimes%2010%5E8%5C%20kg)
The engine of a generate a forward thrust of, ![F=7.4\times 10^5\ N](https://tex.z-dn.net/?f=F%3D7.4%5Ctimes%2010%5E5%5C%20N)
(a) As the supertanker is moving with a constant velocity. We need to find the magnitude of the resistive force exerted on the tanker by the water. It is given by :
F = ma, a is the acceleration
For constant velocity, a = 0
So, F = 0
(b) The magnitude of the upward buoyant force exerted on the tanker by the water is equal to the weight of the ship.
F = mg
![F=1.7\times 10^8\times 9.8\\\\F=1.67\times 10^9\ N](https://tex.z-dn.net/?f=F%3D1.7%5Ctimes%2010%5E8%5Ctimes%209.8%5C%5C%5C%5CF%3D1.67%5Ctimes%2010%5E9%5C%20N)
Hence, this is the required solution.