Answer:
a. <u>position function of the coin:</u>

<u>Now the velocity function:</u>

b. 
c.
& 
d. 
e. 
Explanation:
Given:
- height of dropping the silver dollar,

Given position function associated with free falling objects:

here:
initial height
initial velocity
time of observation
a)
<u>position function of the coin:</u>

∵the object is dropped it was initially at rest
<u>Now the velocity function:</u>


b)
we know average velocity is given as:

Displacement in the given interval:



Now,


c)
Instantaneous velocity at t = 3 s:


Instantaneous velocity at t = 4 s:


d)
At ground we have s=0:
Put this in position function:


e)
Velocity of the coin at impact:


The center of gravity and center of mass ARE the same point.
Answer:A projectile attains its maximum height when the angle of projection is. Question. A projectile attains its maximum height when the angle of projection is.
Explanation:
Answer:
Power will be 0.2023 watt
And when amplitude is halved then power will be 0.0505 watt
Explanation:
We have given mass of the Piano wire m = 2.60 gram = 0.0026 kg
Length of wire l = 84 cm = 0.84 m
So mass density 
Tension in the wire T = 25 N
Frequency f = 120 Hz
So angular frequency 
And amplitude A = 1.6 mm = 0.0016 m
We have to find the generated power
Power is given by 
From the relation we can see that power 
So if amplitude is halved then power will be
times
So power will be equal to 
Voltage, measured in volts (V), is a measure of how much energy is given to the moving electrons in a circuit. Another way of thinking of voltage is by analogy with the pressure that pushes water through the pipes in a house.