Why does ice float on water? A. The temperature of ice is lower than the temperature of water. B. The temperature of water and i
2 answers:
Answer:
C. The density of ice is less than the density of water.
Explanation:
As we know that when ice floats on the water then we can say that
Buoyancy force on ice will be counterbalanced by the weight of ice block
So here we have
now we say that for flotation of ice cube the buoyant force must be greater than the force of gravity
so here we can say
so here density of ice will be less than the density of water
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<em>There is not enough data to solve the problem, but I'm assuming the initial height as h = 10 m for the question to have a valid answer and the student can have a reference to solve their own problem</em>
Answer:
(a)
(b)
Explanation:
<u>Change of Momentum</u>
The momentum of a given particle of mass m traveling at a speed v is given by
When this particle changes its speed to a value v', the new momentum is
The change of momentum is
Defining upward as the positive direction, we'll compute the change of momentum in two separate cases.
(a) The initial height of the superball of m=61.6 gr = 0.0616 Kg is set to h= 10 m. This information leads us to have the initial potential energy of the ball just after it's dropped to the floor:
This potential energy is transformed into kinetic energy just before the collision occurs, thus
Solving for v
This is the speed of the ball just before the collision with the floor. It's negative because it goes downward. Now we'll compute the speed it has after the collision. We'll use the new height and proceed similarly as above. The new height is
The potential energy reached by the ball at its rebound is
Thus the speed after the collision is
The change of momentum is
(b) If the putty sticks to the floor, then v'=0