<h3><u>Answer;</u></h3>
a) 178.6125 Joules
b) Work done does not depend on constant speed or acceleration up the ladder
<h3><u>Explanation</u>;</h3>
Work done =Fd times the cosine of angle between;
where F is force d is distance m is the mass a is acceleration
.F=ma. In this case a=g=9.81 m/s^2 and cos 30=0.866
Therefore;
W= 75 × 9.81 × 2.75 × .866
= 178.6125 Joules
b. The work done by the painter does not depend on whether the painter climbs at constant speed or accelerates up the ladder.
W=3376.945 Joules
Answer:
The correct option is;
The index of refraction of the second medium is lower
Explanation:
The index of refraction of a material indicates the magnitude of the optical density of a material. The index of refraction or the refractive index, n, are indices (ratio) of the speed of light through an optically dense medium relative to the speed of light through a vacuum.
The definition of the refractive index is the number of times light travelling through a medium would be slower than light travelling through vacuum
Therefore, the index of refraction of a second medium that is less optically dense than a first medium from which light originates and travels through it would be lower than the index of refraction of the first medium
Answer:
because when an object approaches the speed of light, it's mass starts to increase exponentially, and would be infinite at the speed of light. It would therefore require MORE than an infinite amount of energy to accelerate even a single electron to the speed of light
This the correct answer who will know this answer