A daredevil wishes to bungee-jump from a hot-air balloon 65.0 m above a carnival midway. He will use a piece of uniform elastic cord lied to a harness around his body to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and a tension force described by Hooke's force law. In a preliminary test, hanging at rest from a 5.00-m length of the cord, the jumper finds that his body weight stretches it by 1.50 m. He will drop from rest at the point where the top end of a longer section of the cord is attached to the stationary balloon. (a) What length of cord should he use? (b) What maximum acceleration will he experience?
A daredevil wishes to bungee-jump from a hot-air balloon 65.0 m above a carnival midway. He will use a piece of uniform elastic cord lied to a harness around his body to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and a tension force described by Hooke's force law. In a preliminary test, hanging at rest from a 5.00-m length of the cord, the jumper finds that his body weight stretches it by 1.50 m. He will drop from rest at the point where the top end of a longer section of the cord is attached to the stationary balloon. (a) What length of cord should he use? (b) What maximum acceleration will he experience?
Solution Summary: The length of the cord the daredevil should use is 25.8m.
A daredevil wishes to bungee-jump from a hot-air balloon 65.0 m above a carnival midway. He will use a piece of uniform elastic cord lied to a harness around his body to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and a tension force described by Hooke's force law. In a preliminary test, hanging at rest from a 5.00-m length of the cord, the jumper finds that his body weight stretches it by 1.50 m. He will drop from rest at the point where the top end of a longer section of the cord is attached to the stationary balloon. (a) What length of cord should he use? (b) What maximum acceleration will he experience?
2.
1.
Tube Rating
Charts
Name:
Directions: For the given information state if the technique is safe or unsafe and why.
60 Hertz Stator Operation
Effective Focal Spot Size- 0.6 mm
Peak Kilovolts
MA
2
150
140
130
120
110
100
90
80
70
2501
60
50
40
30
.01 .02 .04.06 .1
.2
.4.6 1
8 10
Maximum Exposure Time In Seconds
Is an exposure of 80 kVp, 0.1 second and 200 mA within the limits of the single
phase, 0.6 mm focal spot tube rating chart above?
Is an exposure of 100 kVp, 0.9 second and 150 mA within the limits of the single
phase, 0.6 mm focal spot tube rating chart above?
Q: You have a CO2 laser resonator (λ = 10.6 μm). It has two curved mirrors with
R₁=10m, R2= 8m, and mirror separation /= 5m. Find:
R2-10 m
tl
Z-O
12
R1-8 m
1. Confocal parameter. b= 21w2/2 =√1 (R1-1)(R2-1)(R1+R2-21)/R1+R2-21)
2. Beam waist at t₁ & t2-
3. Waist radius (wo).
4.
5.
The radius of the laser beam outside the resonator and about 0.5m from R₂-
Divergence angle.
6. Radius of curvature for phase front on the mirrors R₁ & R2-
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.