Answer:

Explanation:
<u>Vertical Launch Upwards</u>
In a vertical launch upwards, an object is launched vertically up from a height H without taking into consideration any kind of friction with the air.
If vo is the initial speed and g is the acceleration of gravity, the maximum height reached by the object is given by:

The object referred to in the question is thrown from a height H=0 and the maximum height is hm=77.5 m.
(a)
To find the initial speed we solve for vo:



(b)
The maximum time or the time taken by the object to reach its highest point is calculated as follows:



Answer:
a)
, b)
, c)
, d)
, e) The direction of the centripetal acceleration experimented by the gum goes to the center of rotation, f) Zero, g)
.
Explanation:
a) The maximum angular velocity of the fan is:


b) The angular acceleration of the fan is:



c) The magnitude of the tangential aceleration is:


d) The magnitude of the centripetal acceleration is:


e) The direction of the centripetal acceleration experimented by the gum goes to the center of rotation.
f) When fan is at full speed, it rotates at constant rate and, hence, there is no angular acceleration. Besides, the tangential acceleration experimented by the gum is zero.
g) The linear speed of the gum is:


Answer:
A correlation coefficient represents the following:
1- The direction of the relationship
2- The strength of the relationship
Answer:
number of coulombs = 1.28 ×
option b is correct
Explanation:
Given data
area A = 4cm
rate of hole r = 1000 cm/s
length L = 2mm
to find out
number of coulombs
solution
we will apply here number of coulombs formula that is
number of coulombs = e×A×L× r
put here value e = 1.6 ×
coulombs
and A = 4 ×
mand length = 2 ×
m
number of coulombs = 1.6 ×
× 4 ×
× 2 ×
× 1000
number of coulombs = 1.28 ×
so option b is correct
Helpful friction would be the friction on something that you wanted to stop (a car) while unhelpful friction is friction on something that you want to keep going (a curling rock)