![darlenepitre](/avatars/558.jpg)
darlenepitre
16.04.2021 •
Physics
Paper clips, nails, and scissors all act as which of the following?
electromagnets
ion magnets
temporary magnets
Solved
Show answers
More tips
- W Work and Career How to Start Your Own Business: Tips and Recommendations...
- S Society and Politics 10 Tips for Boosting Your Self-Esteem...
- C Computers and Internet How to Create a Folder on Your iPhone?...
- G Goods and services How to sew a ribbon: Tips for beginners...
- F Food and Cooking How to Make Mayonnaise at Home? Secrets of Homemade Mayonnaise...
- C Computers and Internet Which Phone is Best for Internet Surfing?...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
Answers on questions: Physics
- P Physics Electromagnetic waves do require a medium to travel. True False...
- P Physics In a closed system, a group of objects moves energy only among themselves.In which part of the light bulb system is electrical energy being converted into light energy?A Part...
- M Mathematics Describe a question about a population you would like answered. Describe the target population, and the sample population that might help you get a representative sample of...
- C Computers and Technology Round of to the nearest 10 of 15123...
- C Chemistry Calculate the total pressure (in atm) of a mixture of .0200 mol of helium and .0100 mol of hydrogen in a 2.5 l flask at 10c...
- S Spanish Match the subjects to the rest of the sentence correctly . Drag the items on the left to the correct location on the right. Mi hermano y mi padre.. Bianca y yo.. Su tia teresa.....
Ответ:
I think its ion magnets correct me if I'm wrong
Ответ:
a) v = 0.612 m / s , b) v = 0.179 m / s
Explanation:
We can solve this problem using the concepts of conservation of mechanical energy
starting point. Before releasing the cube
Em₀ =
= ½ k x²
final point. At the equilibrium point of the spring
a) in this case there is no friction, so the energy is conserved
Emo = Em_{f}
½ k x² = ½ m v²
v = √k/m x
let's reduce the magnitudes to the SI system
x = 5.00 cm = 0.0500 m
let's calculate
v = √600/4 0.05
v = 0.612 m / s
b) In this part we are told that there is a friction, for which we use the work energy theorem
W = ΔEm
friction force work is
W = fr. x = fr x cos θ
the friction force opposes the movement, so the angle is 180º and the cosine is -1
the formula for friction force is
fr = μ N
let's write Newton's second law on the vertical axis
N - W = 0
N = W
we substitute the friction force
fr = μ m g
of the work energy equation
- fr x = Em_{f} - Em₀
- μ m g x = ½ m v² - ½ k x²
v² = (½ k x² - μ m g x) 2 / m
v = √(k / m x² - 2 μ g x)
v = √ (600/4 0.05² - 2 0.350 9.8 0.05)
v = 0.179 m / s