Physics : asked on lacyfigueroa
 07.11.2021

How would your energy accounting be different in each of these two alternative definitions of the system

. 4

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Physics
Step-by-step answer
P Answered by PhD

1: an elevator moving up to the 3rd floor (gathering potential energy)

2: all options here will increase the GPE

3: the last option

4: just before it hits the ground and has reached a speed of 28 meters per second

5: turning a different direction while moving the same speed

6:a jogger getting faster after spotting a mountain lion behind him on the trail

7: I didn’t watch the lesson

8: at the top of the swinging path, when you are still for a moment just before falling again

9: I d+o)n#t k#n0”w

10: same as 9 sor=ry

Physics
Step-by-step answer
P Answered by PhD

1: an elevator moving up to the 3rd floor (gathering potential energy)

2: all options here will increase the GPE

3: the last option

4: just before it hits the ground and has reached a speed of 28 meters per second

5: turning a different direction while moving the same speed

6:a jogger getting faster after spotting a mountain lion behind him on the trail

7: I didn’t watch the lesson

8: at the top of the swinging path, when you are still for a moment just before falling again

9: I d+o)n#t k#n0”w

10: same as 9 sor=ry

Physics
Step-by-step answer
P Answered by PhD

The question specifies the diameter of the screw, therefore the IMA of this screw is 0.812? / 0.318 = 8.02

Physics
Step-by-step answer
P Answered by PhD
Answer:
7.25 secs.

Explanation:
First find the distance it takes to stop
s = [v^2-u^2]/2a = 0^2 - 8.7^2/2[-2.4] = 8.7^2/4.8
Next find the time it takes to go that distance , s = ut +[1/2] at^2
8.7^2/4.8 = 8.7t +[1/2] [ -2.4]t^2 , rearrange and
t^2 -[8.7/1.2]+ 8.7^2/[(1.2)(4.8)]=0 complete the square
[t - (8.7/2.4)]^2=0
t = 8.7/2.4 = 3.625 secs
At this stage the deceleration will push the object back in the direction it came from for another 3.625 secs when it will be 8.7 m/s again
Total time , T =2t = 7.25 secs.

Note:
The term differential is used in calculus to refer to an infinitesimal (infinitely small) change in some varying quantity. For example, if x is a variable, then a change in the value of x is often denoted Δx (pronounced delta x). The differential dx represents an infinitely small change in the variable x.
Physics
Step-by-step answer
P Answered by PhD
Weight of barbell (m) = 100 kg
Uplifted to height (h) = 2m
Time taken= 1.5 s
Work done by Jordan = potential energy stored in barbell = mgh
= 100×2×9.8
= 1960J
Power = energy/time
= 1960/1.5
1306.67watts
Physics
Step-by-step answer
P Answered by PhD
Weight of jasmine (m) = 400 N
Height climbed on wall (h) = 5m
Total time taken in climbing = 5 sec
Work done in climbing the wall = rise in potential energy = mgh
= 400×9.8×51
= 19600J
Power generated by Jasmine = potential energy / time
= 19600/5
= 3920Watts
Physics
Step-by-step answer
P Answered by PhD
Gravity acceleration (g) = 9.8m/s^2
Time (t) = 3sec
Acceleration = velocity/time
Velocity = acceleration×time
= 9.8×3
= 29.4m/s

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