Assignme Key Concepts Conservative systems: total mechanical eneray is always th

Question

Assignme Key Concepts Conservative systems: total mechanical eneray is always the same gravity is may For true gravity it is -GMm For spring itis kx 212 Work -KE Theorem have conservative and triction forces loss due to tonor:KE before) + P Ebedre) mechariaal energy always te same nurtor throughout he otpors motion E-KE . PE PE tor smae you precent, then the difference between the tokal mechanical energy betore and aher are K.E cae) PE (afher ) + snergy Assignme Your last A raindrop of mass 3.21 x 10* kg falls vertically at constant speed under the infiuence of gravity and air resistancie. Model the drop as a partide. (a) As it fals 70 m, what is the work done on the raindrop by the gravitational force? (b) What is the work done on the raindrop by air resistance? Need Help?ach 2 -2 points SerPSES 7 P 003 in 1990 Walter Arfeuille of Belgium ifted a 28.5-kg object through a distance of 17.1 using only his teeth. a) How much work was done on the object by Arfeuile in this Ift, assuming the object was lifted at constant velocity? (b) What total force was exerted on Arfeuille's teeth during the s? Need Help?d >

Explanation / Answer

1)
A) work done by the gravitational force = Wg =m*g*h = 3.21*10^-5*9.81*70 = 2204.307*10^-5 = 0.02204 J

B) work done by the air resistance is Wr= m*g*h = 0.02204 J

------------------------------------------------------------

2)A) W = m*g*h = 281.5*9.81*0.171 = 472.3 N

B) F = m*g = 281.5*9.81 =2761.515 N

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---