Answer:
(a) v = 1.71 m/s
(b) μ = 0.005
Explanation:
(a)
Using the law of conservation of the momentum:
![m_1u_1+m_2u_2=m_1v_1+m_2v_2\\](https://tex.z-dn.net/?f=m_1u_1%2Bm_2u_2%3Dm_1v_1%2Bm_2v_2%5C%5C)
where,
m₁ = mass of person = 61.1 kg
m₂ = mass of sled = 16.1 kg
u₁ = initial speed of the person = 2.16 m/s
u₂ = initial speed of the sled = 0 m/s
v₁ = v₂ = v = final speeds of both the person and the sled = ?
Therefore,
![(61.1\ kg)(2.16\ m/s)+(16.1\ kg)(0\ m/s)=(61.1\ kg)(v)+(16.1\ kg)(v)\\\\v = \frac{131.976\ kgm/s}{77.2\ kg}](https://tex.z-dn.net/?f=%2861.1%5C%20kg%29%282.16%5C%20m%2Fs%29%2B%2816.1%5C%20kg%29%280%5C%20m%2Fs%29%3D%2861.1%5C%20kg%29%28v%29%2B%2816.1%5C%20kg%29%28v%29%5C%5C%5C%5Cv%20%3D%20%5Cfrac%7B131.976%5C%20kgm%2Fs%7D%7B77.2%5C%20kg%7D)
<u>v = 1.71 m/s</u>
<u></u>
(b)
The kinetic energy lost by the sled must be equal to the frictional energy:
K.E = fd
![\frac{1}{2}mv^2=\mu Rd = \mu Wd\\\\\frac{1}{2}mv^2=\mu mgd\\\\\frac{1}{2}v^2=\mu g\\\\\mu = \frac{v^2}{2gd}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7Dmv%5E2%3D%5Cmu%20Rd%20%3D%20%5Cmu%20Wd%5C%5C%5C%5C%5Cfrac%7B1%7D%7B2%7Dmv%5E2%3D%5Cmu%20mgd%5C%5C%5C%5C%5Cfrac%7B1%7D%7B2%7Dv%5E2%3D%5Cmu%20g%5C%5C%5C%5C%5Cmu%20%3D%20%5Cfrac%7Bv%5E2%7D%7B2gd%7D)
where,
μ = coefficient of kinetic friction = ?
d = distance covered = 30 m
g = acceleration due to gravity = 9.81 m/s²
Therefore,
![\mu = \frac{(1.71\ m/s)^2}{(2)(9.81\ m/s^2)(30\ m)}](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%5Cfrac%7B%281.71%5C%20m%2Fs%29%5E2%7D%7B%282%29%289.81%5C%20m%2Fs%5E2%29%2830%5C%20m%29%7D)
<u>μ = 0.005</u>
I honestly think it's 18,000 N
Hope I helped!
<span>So if you started on the bench press with 8 reps of 225 pounds, but can now do 10 reps, and you've been able to achieve 10 reps for two workouts in a row, increase the weight.
</span>
Theres a little exclamation......
Answer:
Increase Water Consumption
Try a New Diet
Help Your Cat Maintain a Healthy Weight
Increase Exercise and Enrichment
Minimize Stress and Anxiety
Add More Litter Boxes
Try Fiber or Probiotics
Ask Your Vet About Over-the-Counter Laxatives
Explanation:
<h2><em>
Hope this helps ;)</em></h2>
<em></em>
B
Step by step explanation- I took the quiz
Answer: A north pole and a south pole
Explanation: All magnets no matter how big or small they are will always have poles. All magnets have two regions of magnetic strength where they are the strongest. Even if I cut a magnet in half, it would still have poles.
It's important to understand that there like poles repel each other and opposites attract.