Answer:
yes it does
Explanation:
Going by the law of conservation of momentum, when two objects collides, the momentum of one object is transferred to the other object.
This collision can be elastic or inelastic coliision
let the mass of the brick be m1
the mass of the cart be m2
the velocity (initial and final) of the brick u1 and v1
the velocity (initial and final) of the cart u2 and v2
For elastic collision
m1u1+m2u2= m1v1+m2v2
For inelastic collision the two bodies will move with the same velocity after impact
m1u1+m2u2=(m1+m2)V
Because the sun stays in the same place but your brain makes you think the sun is descending so your eyes think you're higher than the sun
Answer:
We can use optical fibers.
Explanation:
The optical fibers are the optical devices which is based on the total internal reflection.
The optical fiber has two layers, one is called core and the other is called cladding.
The refractive index of core is more than the cladding.
As a ray of light falls on the core at more than the critical angle for that pair of media(core and cladding), it suffers the total internal reflection at the interface.
Answer:
F = 5226.6 N
Explanation:
To solve a lever, the rotational equilibrium relation must be used.
We place the reference system on the fulcrum (pivot point) and assume that the positive direction is counterclockwise
F d₁ = W d₂
where F is the applied force, W is the weight to be lifted, d₁ and d₂ are the distances from the fulcrum.
In this case the length of the lever is L = 5m, t the distance desired by the fulcrum from the weight to be lifted is
d₂ = 200 cm = 2 m
therefore the distance to the applied force is
d₁ = L -d₂
d₁ = 5 -2
d₁= 3m
we clear from the equation
F = W d₂ / d₁
W = m g
F = m g d₂ / d₁
we calculate
F = 800 9.8 2/3
F = 5226.6 N
