<span>a planes engines are designed to move it forward at high speed. That makes air flow rapidly over the </span>wings<span>, which throw the air down toward the </span>ground<span>, generating an upward force called </span>lift<span> that overcomes the </span>plane's<span> weight and holds it in the sky. ... The </span>wings<span> force the air downward and that pushes the </span>plane<span> upward</span>
Answer:
Explanation:
Given that,
The mass of a Moon, 
The mass of the Earth, 
The moon's mean orbit distance around the earth is, 
We need to find the gravitational force exerted on the moon by the Earth.
The formula of gravitational force is given by :
So, the required force is 
.
They discovered a vaccine to reduce illnesses, specifically Polio and Influenza. The work of Salk and Sabin has almost eradicated what was once a deadly disesase ( polio) . For example, there were 350,000 deaths related to poliovirus across the world in 1988 and they reduced to 22 in 2017. Also, their work has saved millions of lives from polio induced paralysis
Answer:
Speed of the light in water= 225,000 km/s
Explanation:
At the speed with which light propagates through a homogeneous and transparent medium, it is a constant characteristic of that medium, and therefore, it changes from one medium to another.
Due to its enormous magnitude, the measurement of the speed of light has required the invention of ingenious procedures that will overcome the inconvenience of short land distances in relation to such extraordinary speed.
Astronomical methods and terrestrial methods have been giving ever closer results. At present, the value c = 299,792,458 km / s is accepted for the speed of light in a vacuum. In any transparent material medium the light propagates with a speed that is always lower than c. Thus, for example, in water it does so at around 75% of the speed of light in a vacuum: about 225,000 km / s.
Do 25-14 and you will get your answer
