Answer:
a) W = 40.49 10² J and b) W₂ = - 3308.7 J
Explanation:
The equation for work is
W = F. d
Bold indicates vectors, we can also write that equation with the modules
W = F d cos θ
Where θ is the angle between force and displacement
a) Traction reinforcement work
W = 3.59 10² 12.3 cos 23.5
W = 40.49 10² J
b) frictional force work, we have to use Newton's second law to find the friction force
Y Axis
N-W = 0
N = W
The formula for friction force is
fr = μ N
fr = μ mg
fr = 0.289 95.0 9.8
fr = 269 N
The friction force opposes the movement, so that at an angle it is 180º
W₂ = fr d cos T
W₂ = 269 12.3 cos 180
W₂ = - 3308.7 J
Answer:light year is a measurement of distance. It is often used in special theory of relativity
Explanation:
Answer: You should aim at an above point.
Explanation:
The light when it goes from the air to a densier substance as water suffers the effect called refraction in which the relative angle of incidence is different, in general, from the refracted one, as shown in the picture. Since water has greater density than air, then the refracted angle is smaller than the incident angle of the light beam, then to reach the actual location of the object from outside de pool it is necessary to aim a little above the real location, so that the light reaches it.