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Answer:
0.6 m/s
Explanation:
Let the raft speed be v.
Given:
Mass of the swimmer (m) = 75 kg
Mass of the raft (M) = 500 kg
Speed of swimmer after leaving the raft (u) = 4 m/s
Now, the given situation can be considered a problem of conservation of total momentum before and after collision.
Momentum is the product of mass and velocity.
Here, the swimmer and raft are the bodies in collision.
So, before the collision, both the bodies were at rest. So, initial momentum is 0. Now, from conservation of momentum, the final momentum of the system must be 0 after the collision. Therefore,
Final Momentum = 0
Plug in the given values and solve for 'v'. This gives,
The final velocity of the raft is -0.6 m/s. Now, speed is the magnitude of velocity.
Therefore, the corresponding raft speed is 0.6 m/s.
Answer:
162.78 m/s is the most probable speed of a helium atom.
Explanation:
The most probable speed:
= Boltzmann’s constant =
T = temperature of the gas
m = mass of the gas particle.
Given, m =
T = 6.4 K
Substituting all the given values :
162.78 m/s is the most probable speed of a helium atom.