1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vladimir2022 [97]
3 years ago
7

A 80 kg bungee jumper is on a bridge that is 100 meters above a river. Attached to the jumper is a bungee cord that is 50 meters

long. After jumping off of the bridge, the jumper reaches a position that is 10 meters above the river when the bungee cord is at its maximum stretch.
Required:
a. How much energy is stored in the bungee cord at that maximum stretch?
b. What is the spring force constant of the bungee cord?
Physics
1 answer:
Usimov [2.4K]3 years ago
7 0

Answer:

a) 70,560 J

b) 88.2 N/m

Explanation:

The spring potential will equal the change in gravity potential

PS = PE = mgh = 80(9.8)(100 - 10) = 70,560 J

PS = ½kx²

k = 2PS/x² = 2(70560)/(100 - 50 - 10)² = 88.2 N/m

You might be interested in
g A The box leaves position x=0 with speed v0. The box is slowed by a constant frictional force until it comes to rest at positi
CaHeK987 [17]

Answer:

 fr = m v₀² / 2 (x₁-x₀)

Explanation:

a) For this exercise we use Newton's second law  

X axis  

    - fr = ma  

Y Axis  

     N-W = 0  

     N=W

let's look for acceleration with expressions of kinematics  

      v² = v₀² - 2 a Δx  

at the point where stop v = 0

     a = v₀² / 2 Δx

let's replace  

     -fr = m (- v₀² / 2 (x₁-x₀))

      fr = m v₀² / 2 (x₁-x₀)

b)they ask for the same  

in this case part of rest  

v₁² = 0 + 2 a Δx  

a = v₁² / 2ΔX  

we write Newton's second law  

F - fr = m a  

fr = F - ma  

fr = F - m v₁² / 2Δx

3 0
4 years ago
if for every force there is an equal and opposite reaction force, how is it possible for an object to accelerate
lesya692 [45]

Answer:

By the use of the reaction force one body is able to accelerate because it is not fixed to a rigid support which offers a materialistic resistance.

Explanation:

For every  force there is an equal and opposite reaction is stated in the Newton's third law of motion holds true universally.

This law accounts for the acceleration of the bodies with respect to the object that applies force on the other body. The acceleration is possible when iether one of the body is fixed and cannot move or when that both the bodies are not fixed can move.

  • For example consider a rocket with its engine started. This rocket generates upthrust by conversion of chemical energy of the fuel into the mechanical energy applying force on the launchpad. When this force is large enough it to lift the rocket then the rocket starts moving in the air and it  accelerates. Now, when it is in the air or in vacuum during the course of its journey it uses the reaction of the burnt gases of the fuel to change the momentum.

This is in accordance with the Newton's second law of motion, stating that the Force is directly proportional to the rate of change in momentum.

8 0
3 years ago
If a rock has a density of 2g/cm³ and a volume of 8cm³, what is its mass?
Yakvenalex [24]
Density=mass÷volume
mass=density×volume
mass=2×8=16 g
3 0
3 years ago
The _____ of an object consists of its speed and direction.
ELEN [110]
Velocity would be an answer
3 0
3 years ago
Estimate under what set of conditions it is possible, despite the spherical shape of the working electrode, to use linear diffus
goldfiish [28.3K]

When the experimental measurements diverge at very low values of the voltages. When the ratio of current to saturated current is very small. That is, i/I less than or equal to 1/100. When there is a finite current at Voltage

V = 0

Diffusion will have influence on current - voltage curve in the working electrode which is ionization detector.

The estimation under set of conditions that is possible, despite the spherical shape of the working electrode, to use linear diffusion equations to theoretically predict the current vs voltage curve expected in this experiment will be:

  • When the experimental measurements diverge at very low values of the voltages
  • when the ratio of current to saturated current is very small. That is, i/I less than or equal to 1/100
  • When there is a finite current at Voltage V = 0

Where

i = electric current

I = saturated current

V = voltage supplied

The curve expected will therefore give exponential curve from positive to negative domain because of the diffusion of ions from different directions

Learn more here: brainly.com/question/23985719

8 0
3 years ago
Other questions:
  • Describe how light radiation leaves a star, travels through the vacuum of space, and finally is seen by someone on earth.
    8·1 answer
  • Does newton all three of his laws have to do with the egg drop
    5·1 answer
  • The deck of a bridge is suspended 235 feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of
    8·1 answer
  • A soccer ball is kicked from the top of one building with a height of H1 = 32.0 m to another building with a height of H2 = 13.8
    7·1 answer
  • Question:
    13·2 answers
  • Plsss anyone help I BEG. its not that hard im just lazy and don't feel like thinking3
    15·1 answer
  • Why do scientists believe the universe is still expanding?
    11·1 answer
  • Heat energy is produced when molecules move. True False
    8·1 answer
  • Which of the following best describes the relationship between frequency and wavelength of electromagnetic waves?
    6·1 answer
  • Two stretched copper wires both experience the same stress. The first wire has a radius of 3.9×10-3 m and is subject to a stretc
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!