Physics, 19.11.2019 05:31, kseniyayakimno

Agirl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.9 m/s. the coefficient of kinetic friction between the sled’s runners and the hard, icy snow is 0.038, and the girl and sled together weigh 750 n. the acceleration of gravity is 9.81 m/s 2 . how far does the sled travel on the levelground before coming to a rest? answer in units of m.

Answers: 1

Show answers

Answers

answered: danielamadrid79

x=83.71m

Explanation:

The frictional force is given by:

$F_f=\mu_s N(1)$

According to Newton's second law:

$\sum F_y:N=W(2)\\\sum F_x:F_f=ma(3)$

Replacing (2) and (3) in (1):

$ma=\mu_s W(4)$

To find the mass of the girl on the sled, we divide their weigh into the acceleration of gravity:

$W=mg\\m=\frac{W}{g}(5)\\$

Replacing (5) in (4). Solving for a:

$\frac{W}{g}a=\mu_s W\\a=\mu_s g$

Finally, using this kinematic equation, we calculate the distance traveled before coming to a rest ( v_f=0 ):

$v_f^2=v_0^2-2ax\\x=\frac{v_f^2-v_0^2}{-2a}\\x=\frac{v_f^2-v_0^2}{-2\mu_s g}\\x=\frac{0^2-(7.9\frac{m}{s^2})^2}{-2(0.038)(9.81\frac{m}{s^2})}\\x=83.71m$

answered: Guest

it takes about 30 days for it to break down

answered: Guest

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account. she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem. she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem. her desire for the new hairstyle is in conflict with her honesty and integrity.

d. if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it. the amount she has in her account is not the problem. and if i may suggest, she might as well close her checking account, and put the money where it'll work for her. it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now. under no circumstances should he ask for a higher limit.

b. he can ask for the grace period to be extended. but that's no solution, the bank will almost certainly refuse anyway, and there are much better options. he knew the rules of his credit card when he started using it.

c. he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d. he definitely should pay the minimum otherwise they could shut down his card. he should also pay as much more as he possibly can. he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices. what he has to do: pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.

Other questions on the subject: Physics

Physics, 22.06.2019 06:30, bradleydb222

5submission this assignment is worth 20 points total. you are required to submit the following by next lab: 1. (3 points) determine the equation for the output angular velocity ω2 = θ˙ 2 as a function of θ1, ω1 = θ˙ 1 and α. you must show all your work to receive credit. 2. (2 points) use the result of problem#1 to plot ω2 over 0 ≤ θ1 ≤ 360deg with ω1 = 360deg/sec. do this for α = {10,30}deg. show the results on the same plot and properly label the axes, title, legend. for this you can use matlab or ms excel. 3. (3 points) determine the equation for the output angular acceleration ω˙ 2 and create a plot similar to the one in problem#2. 4. (10 points) submit plots of the results (ω2 and ω˙ 2) obtained from creo/mechanism and compare them to results of problem#2 and problem#3. note that you should do these comparisons for the two cases with α = {10,30}deg. 5. (2 points) provide a brief explanation of the results. did they match? what are the implications as misalignment angle increases?

Answers: 3

continue

Physics, 22.06.2019 08:00, cia196785920

If a balloon is taken outside on a very cold day, what will occur?

Answers: 1

continue

Physics, 22.06.2019 13:10, pearlvldz

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Answers: 2

continue

Physics, 22.06.2019 14:30, samone26

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates

Answers: 3

continue

Do you know the correct answer?

Agirl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.9 m/s. the...