The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume e =
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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
Transformer contains two coils: primary and secondary. They allow change of voltage to lower or higher value. In first case we have step-down and in second case we have step-up transformer.
Formula used for transformer is:
Where:N1 = number of turns on primary coilN2 = number of turns on secondary coilV1 = voltage on primary coilV2 = voltage on secondary coil
In a step-down transformer primary coil has more turns than secondary coil. So the ratio 1:38 means that for each turn on secondary coil we have 38 turns on primary coil.
We can solve the equation for V2:
Secondary coil provides voltage of 3.16V.
Formula used for transformer is:
Where:N1 = number of turns on primary coilN2 = number of turns on secondary coilV1 = voltage on primary coilV2 = voltage on secondary coil
In a step-down transformer primary coil has more turns than secondary coil. So the ratio 1:38 means that for each turn on secondary coil we have 38 turns on primary coil.
We can solve the equation for V2:
Secondary coil provides voltage of 3.16V.