Energy physics problem, please help?
The speed v of a 1.05 kg cart is measured after it rolls 1.00 m down an inclined track. Five readings are taken and the average and standard deviation of the speed is computed. The results are v = 0.20 m/s and σv = 0.14 m/s.
Calculate the fractional standard deviation in the speed.
Calculate the kinetic energy of the cart at the end of the trip
Calculate the fractional standard deviation in the kinetic energy.
Thank you in advance!
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I can only answer the first two parts as I am struggling to solve the last part also (we are in the same class!).
Calculate the fractional standard deviation in the speed.
0.14/0.20=0.7
Calculate the kinetic energy of the cart at the end of the trip
KE=1/2mv^2
KE=1/2(1.05 kg)(0.20 m/s)^2=0.021 J
Calculate the fractional standard deviation in the kinetic energy.
I could really use this answer also!
And also these two:
Calculate the standard deviation in the kinetic energy.
σK =
Record the value of the kinetic energy using the form K±σK (units) with correct significant figures .