"Nuclear Fusion" <span>produces radiant energy in stars
Hope this helps!</span>
Yes, atoms are identified as the particles of an element...these consist of electron,protons and neutrons...that form everything we see and are able to touch
Answer:
A. 231.77 J
B. 5330.71 J
C. 46 donuts
Explanation:
A. To lift the barbell once, she will have to extend it the full length of her arm. The work done will then be:
W = F * d
Where the force is the weight of the barbell.
F = m * g
Hence, the work done in lifting the barbell is:
W = m * g * d
W = 43 * 9.8 * 0.55
W = 231.77 J
B. If she does 23 repetitions, the total energy she expend will be equal to the Potential energy when the barbell is lifted multiplied by 23:
E = 23 * m * g * d
E = 23 * 231.77
E = 5330.71 J
C. 1 Joule = 4.184 calories
5330.71 Joules = 5330.71 * 4.184 = 22303.69
If 1 donut contains 490 calories, the number of donuts she will need will be:
N = 22303.69/490 = 45.5 donuts or 46 donuts
Answer: 14139.19 m
Explanation:
This situation is related to parabolic motion and can be solved using the following equations:
(1)
(2)
Where:
is the horizontal distance (where the artillery shell lands)
is the initial velocity
is the angle
is the time
is the final height
is the initial height
is the acceleration due gravity, always directed downwards
So, let's begin by isolating from (2):
(3)
(4)
Substituting (4) in (1):
(5)
Rewriting (5) and taking into account 
:
(6)
(7)
Finally:
