Answer:
A. As the ropes are horizontal the child has travelled 2m of vertical displacement from his lowest position.
Gpe @ A=mgh=40*9.81*2=784.8J
B. At 30degree vertical angle the vertical displacement from lowest position is given by
2-2cos(30)=2-1.73=0.27m
Gpe @B= 40*9.81*0.27=106 J
C: at the bottom of circular arc it's Gpe is zero relative to lowest position as bottom of arc itself is lowest position.
Quantum dots are crystals of a fluorescent semiconductor material with a diameter of as few as 10 to 100 atoms. They are used as labels for imaging molecules because of their very narrow fluorescence, brightness, and resistance to photobleaching.
This is the most recent information I could find.
I hope this helps:)
Answer:External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system.
Explanation:or our purposes, we will simply say that external forces include the applied force, normal force, tension force, friction force, and air resistance force. And for our purposes, the internal forces include the gravity forces, magnetic force, electrical force, and spring force.HOPE THIS HELPS!!! ^w^
Answer:
Explanation:
distance walked
5000 + 3000 + 1000 = 9000 m
time taken to do the walk
9000 m / 1 m/s = 9000 s
magnitude of displacement during the walk
d = √((5000 - 1000)² + 3000²) = 5000 m
direction of displacement
θ = arctan(3000/4000) = 36.869897...°
velocity
v = d/t = 5000 m / 9000 s = 0.5556 m/s 36.87° N of E