Answer:
The value is [tex]t = 1.374 *10^{-7} \ m[/tex]
Explanation:
From the question we are told that
The refractive index is [tex]\mu = 1.29[/tex]
The wavelength is [tex]\lambda = 709 \ nm = 709 *10^{-9} \ m[/tex]
Generally the condition for constructive interference is
[tex]2 * \mu * t = (n - \frac{1}{2} )\lambda[/tex]
At minimum thickness(t) the order of the fringe(n) will be equal to 1
So
[tex]2 * 1.29 * t = (1 - \frac{1}{2} )* 709 *10^{-9}[/tex]
=> [tex]t = 1.374 *10^{-7} \ m[/tex]
Velocity ratio of single movable pulley is 2 when Velocity ratio of single fixed pulley is 1. why
Answer:
Velocity ratio of single pulley = 2
Explanation:
Given:
Tension T
Distance = T + T = 2T
Find:
Velocity ratio of single pulley
Computation:
Velocity ratio of single pulley = Total distance / Distance effort
Velocity ratio of single pulley = 2T / T
Velocity ratio of single pulley = 2
g A 240-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the merry-go-round from rest to an angular speed of 0.600 rev/s in 2.00 s
Answer:
339.3 N
Explanation:
First, we start by converting the units.
1 rev/s = 2π rad/s, so
0.6 rev/s = 2π * 0.6 rad/s
0.6 rev/s = 1.2π rad/s
0.6 rev/s = 3.77 rad/s
Now we apply the equation of motion,
W(f) = w(o) + αt
3.77 = 0 + α * 2
3.77 = 2α
α = 3.77/2
α = 1.885 rad/s²
Torque = I * α
Torque = F * r
This means that
I * α = F * r, where I = 1/2mr²
Substituting for I, we have
1/2mr²α = F * r, making F the subject of formula, we have
F = 1/2mrα, then we substitute for the values
F = 1/2 * 240 * 1.5 * 1.885
F = 678.6 / 2
F = 339.3 N
what is the best inference for the speed of the car after 3 seconds
Answer:
B. 17m/s
Explanation:
This question contains a graph that illustrates the relationship between the speed of a car over time. The graph shows that one can make an inference of the amount of time it takes for the car to cover a particular speed and vice versa.
In this case, after 3 seconds, the speed of the car will be 17 m/s. This inference was got by tracing the position of 3s in the x-axis to the value on the y-axis. Doing this, the best inference for the speed of the car after 3 seconds is 17m/s.