Explanation:
Two objects that only have the force of gravity acting on them, will fall with the same acceleration <span>g=9.8<span>m<span>s2</span></span>; g=32.2<span><span>ft</span><span>s2</span></span></span> and will therefore hit the ground at the same time.
When you drop a feather, air resistance acts on all the surfaces of the feather. This causes the feather to slow down.
Air resistance depends on two factors: the speed of the object (increased for example by throwing it), and its surface area.
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Answer:
Atom, the cross-platform, open source code editor developed by Github, has become quite popular thanks to its plug-ins and embedded Git Control. ... There are, however, official Atom repositories for some Linux distributions, like Ubuntu, Debian, Fedora, Red Hat, CentOS, and open.
Answer:
The efficiency of the engine is 75% under given conditions.
<u>Explanation:
</u>
<em>Efficiency is defined as the ratio of work done by the engine to the total heat supplied to a heat engine</em>. We know work done by the heat engine be difference between total heat supplied 
by total heat utilized 
. We can derive formula for efficiency by considering the above factors, 
Now consider a heat engine is at a temperature of 500K and the heat produced by the engine released to the surroundings at a temperature of 125K. The efficiency is calculated by using the above formula, 
∴ Efficiency of the engine is 75%
Answer: a) Twice Chuck's
Explanation:
If the angular speed is constant, as the merry - go -round is a rigid body, so the distance between two points must remain the same, it is needed that the points farther the center, move faster than the ones closer to it.
There exists a relationship between tangential and angular speed, as follows, that relates the definitions of linear and angular speed, and the angle definition:
angle = arc / radius ⇒ Δθ/Δt = Δs/Δt / r ⇒ ω = v/r ⇒ v = ω. r
If ω is constant, v is directly proportional to r, distance to the center (radius in a circular platform), so if r is twice for Andrea, her tangential speed must be twice Chuck's.
