Answer:
4.0 cm
Explanation:
For the compression of the spring, the kinetic energy of the mass equals the elastic potential energy of the spring.
So, 1/2mv² = 1/2kx² ⇒ x = (√m/k)v
Since m and k are constant since its the same spring x ∝ v
If our speed is now v₁ = 2v, our compression is x₁
x₁ = (√m/k)v₁ = (√m/k)2v = 2(√m/k)v = 2x
x₁ = 2x
Since x = 2.0 cm, our compression for speed = 2v is
x₁ = 2(2.0) = 4.0 cm
Answer:
The speed of the light ray is halved
Explanation:
The index of refraction of a medium is the ratio between the speed of light in a vacuum (c) and the speed of light in the medium (v):
For medium X, we have
(1)
For medium Y, we have
(2)
Dividing (1) by (2), we find
(3)
In this problem, the index of refraction of medium Y is twice as great as the index of refraction of medium X:
Substituting this into eq.(3), we get
So, as a light ray travels from medium X into medium Y, the speed of the light ray is halved.
Answer:
Sirius
Explanation:
On the HR diagram Sirius is the closet.
Answer:
A) True B) False C) True
Explanation:
To understand this concept we need to plan the equations related to the movement in the X-axis and the Y-axis thus we can see the behavior of the particle under the different forces.
In the attached image we can check the equation related with the forces.
A) The sum of the forces is 0 in both axis, therefore there is no movement of the particle.
B) In the previous point, we figure out that there is no movement and therefore no acceleration effect.
C) If a body or particle is not accelerating it will be in equilibrium or traveling at a constant velocity.