A force that opposes motion in moving parts is friction. A
Answer:
correct option is B. 1.39
Explanation:
given data
angle of incidence (θ) = 54.2 degrees
to find out
index of refraction of the glass
solution
we know that here reflected beam is completely polarized
so angle of incidence = angle of polarized ....................1
for reflective index we apply here Brewster law that is
μ = tan(θ) ...............2
put here θ value we get
μ = tan(54.2)
μ = 1.386
so correct option is B. 1.39
Answer:
26.82m/s
Explanation:
Given
Mass = m= 0.4kg
Initial Velocity = u = 0
Charge = 4.0E-5C
Distance= d = 0.5m
Object Charge = 2E-4C
First, we'll calculate the initial energy (E)
E = Potential Energy
PE = kQq / d
Where k = coulomb constant = 8.99E9Nm²/C²
Energy is then calculated by;
PE = 8.99E9 * 4E-5 * 2E-4 / 0.5
PE = 143.84J
Energy = Potential Energy = Kinetic Energy
K.E = ½mv² = 143.84J
½mv² = ½ * 0.40 * v² = 143.85
0.2v² = 143.85
v² = 143.85/0.2
v² = 719.25
v = √719.25
v = 26.81883666380777
v = 26.82m/s
Hence, the object is 26.82m/s fast when the cart moving is very far (infinity) from the fixed charge
Distance = (1/2) (acceleration) (time)²
1.4m = (0.835 m/s²) (time)²
(time)² = (1.4/0.835) s²
<em>time = 1.295 s</em>
