Calculate how much mechanical energy is lost. Calculate the average force of friction applied to the feather. (answer is .233J and .111N)
I keep on getting .0233J and .111N... I don't know what I'm doing wrong. Thank you for your help :)
I keep on getting .0233J and .111N... I don't know what I'm doing wrong. Thank you for your help :)
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Note that the initial potential energy of the feather is:
PE = mgh
= (0.0012 kg)(9.8 m/s^2)(2.1 m) [note: m must be in kg to get Joules as the unit]
= 0.0247 J.
The final KE is:
KE = (1/2)mv^2
= (1/2)(0.0012 kg)(1.5 m/s)^2
= 0.00135 J.
Subtracting these two will give the energy lost to be 0.0233 J which is what your answer is. Maybe the answer key is wrong?
PE = mgh
= (0.0012 kg)(9.8 m/s^2)(2.1 m) [note: m must be in kg to get Joules as the unit]
= 0.0247 J.
The final KE is:
KE = (1/2)mv^2
= (1/2)(0.0012 kg)(1.5 m/s)^2
= 0.00135 J.
Subtracting these two will give the energy lost to be 0.0233 J which is what your answer is. Maybe the answer key is wrong?