Refraction occurs when a wave
2 answers:
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Answer:
Explanation:
Mathematically, linear momentum is expressed as the product of mass and velocity. Linear momentum conservation law states that a body or system of bodies retains its total momentum unless an external force is applied to the system.
In this case, the system consists of two carts.
At the start, the linear momentum (P) of the system is equal to:
It's only composed of linear momentum of the standard cart because cart A doesn't have any linear momentum at that moment.
After the collision, linear momentum has to be the same
where m_A is the mass of the cart A.
Solving for m_A
After the cart A rebounds, the linea momentum of the system has changed (because of the force present in the rebound). The new linear momentum is:
Then, the lump of putty is added to the system, but the linear momentum has to be the same, because we added a mass, not a force. The mass of that putty (m_p) has to be added to the equation of the system
Solving for m_p
Answer:
Explanation:
Given
mass of box is m
speed of box is v
coefficient of friction
Box is moving at a constant speed i.e. Net Force on box is zero
i.e. Frictional Force and Force Applied are Equal
The Rate at which power is generated is
The sleds speed when the spring returns toits uncompressed length is v = 0.03 m/s.
<u>Explanation</u>:
Given,
force constant = 42 N/cm = 0.42 N/m, mass m = 68 kg, spring x = 0.39 m
The potential energy, U, stored in the spring is
U = 1/2 kx^2
= 1 / 2 0.42
(0.39)^2
= 0.032 J
All its potential energy has been converted into kinetic energy since it has a uncompressed length.
K = 1/2 mv^2
v = sqrt (2K / m)
= √(( 2 0.032) / 68)
v = 0.03 m/s .