Answer:
Part A:
(a): -121.26 ft/s.
(b): -121.13 ft/s.
(c): -121.052 ft/s.
(d): -121.026 ft/s.
Part B:
-121.00 ft/s.
Explanation:
Given that the height of the balloon after t seconds is

The average velocity of an object is defined as the total distance traveled by the object divided by the time taken in covering that distance.

where,
are the positions of the object at time
and
respectively.
<h2><u>
Part A:</u></h2><h2 />
- For the average velocity for the time period beginning when t=3 and lasting .01 sec.
For this case,
- For the average velocity for the time period beginning when t=3 and lasting .005 sec.
For this case,

- For the average velocity for the time period beginning when t=3 and lasting .002 sec.
For this case,

- For the average velocity for the time period beginning when t=3 and lasting .001 sec.
For this case,

<h2><u>
Part B:</u></h2>
The instantaneous velocity of the balloon at the given time is defined as the rate of change of its position at that time.

<u>Note:</u><em> The negative sign with all the velocities indicates that the direction of these velocities are downwards.</em>
<em> </em>
Answer:
a) 7.947 radians
b) 
Explanation:
y = Distance from central bright fringe = 2.5 mm
λ = Wavelength = 600 nm
L = Distance between screen and source = 2.8 m
d = Slit distance = 0.85 mm


a) Phase difference

∴ Phase difference between the two interfering waves on a screen at a point 2.50 mm from the central bright fringe is 7.947 radians
b) 
∴ Ratio of the intensity at this point to the intensity at the center of a bright fringe 
in the same direction as the displacement vector and the motion
Answer: Gravitational force
Explanation:
A non contact force can be described as a force applied to an object by another body that is not in direct contact with it.
For example, an object thrown upwards will return back due to the force of gravity acting on it. So, it means Gravitational force is acting on the body without necessarily being in contact with that body.
Answer:
0.057 joules is needed to create the total rotational energy each second.
Explanation:
The energy rate is the ratio of total energy to time, which coincides with the definition of power at constant rate:




0.057 joules is needed to create the total rotational energy each second.