Answer:
The angle of refraction of sheet 3 when sheet 1 is on top of it is
Explanation:
From the question we are told that
The angle of incidence is
The angle of refraction angle for sheet 1 is
The angle of refraction for sheet 3 is
According to Snell's law
Where are refractive index of sheet 1 and sheet 2
=>
Also when sheet 3 in on top of sheet 2
substituting for
=>
when sheet 1 in on top of sheet 3
where is the angle of refraction when sheet 1 is on top of sheet 3
substituting for
=>
substituting values
=>
=>
Answer:
Explanation:
consider the mass of each train car be m
m₁ = m₂ = m₃ = m
speed of the three identical train
u₁ = u₂ = u₃ = 1.8 m/s
m₄ = m u₄ = 4.5 m/s
m₅ = m u₅ = 0 (initial velocity )
final velocity
v₁ = v₂ = v₃ = v₄ = v₅ = v
using conservation of momentum
m₁u₁ + m₂u₂ + m₃u₃ + m₄u₄ + m₅u₅ = m₁v₁ + m₂v₂ + m₃v₃ + m₄v₄ + m₅v₅
m (1.8 + 1.8 + 1.8 +4.5) = 5 m v
Answer:
70 mph
Explanation:
We can write the position of the car at time t as
where is the speed of the car, while the position of the truck is
where
is the initial distance between the car and the truck (at 3:00 pm)
is the speed of the truck
The car overcomes the truck when they have same position, so
This occurs at 4:30 pm, so 1:30 h (1.5 h) after the initial instant. So, by using
t = 1.5 h
And solving the equation for , we find the speed of the car:
Answer:
Forces, Gravity, Friction, Direction, Acceleration.