Review | Constant Part A The potential energy of two atoms in a diatomic molecule is approximated by U (r) = a/rl2 - b/r , where r is the spacing Find the component of force along the line connecting the two atoms, F. (r), on one atom as a function of r. between atoms and a and 6 are positive constants. Express your answer in terms of the variables a, b, and r. AEd F.(7) = Submit Request Answer Part BCHW 07 Problem 7.74 Part A A small object with mass m = 0.0900 kg moves along the + I-axis. The only force on the object is a conservative force that has the potential-energy function U(x) = -or' + Ba , where When the object is at z = 4.00 m, what is its speed? a = 7.50 J/m and 8 = 0.300 J/m*. The object is released from rest at small . Express your answer with the appropriate units. HA - 0 0 ? U= Value Units k on Submit Request Answer Part B When the object is at c = 4.00 m, what is the magnitude of its acceleration? Express your answer with the appropriate units. - oml ? Value Units Submit Request AnswerDue Friday by 11:59pm Points 21 Submitting an external tool . Available after Jan 4 at 9:47pm CHW 07 Problem 7.74 Express your answer with the appropriate units. A small object with mass m = 0.0900 kg moves along the + r-axis. The only force on the object is a conservative force that has the potential energy function U(x) = -ar' + fr, where a = 7.50 J/m and # = 0.300 J/m. The object is released from Value Units rest at small c. Submit Request Answer Part C Complete previous part(s) k on Part D What is the maximum value of I reached by the object during its motion? Express your answer with the appropriate units. FOO ? Value Units Submit Request Answer I Anvow I Constaris Find the friction force on the box. Express your answer In newions. At a construction site, a 63.0 kg bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 81.0 kg 6 ? box on a horizontal roof (see the figure (Figure 1)). The cable pulls horizontally on the box, and a 45.0 kg bag of gravel rests on top of the box. The coefficients of friction Fbox N between the box and roof are shown. The system is not moving. Submit Bequest Answer on Part C Figure 1 of 1 Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.10 m from rest. (You can check your answer by solving this problem using Newton's laws.} Express your answer in meters per second. Gravel Box IVO 03 ? m/s M. = 0.700 HE = 0.400 Submit Request Answer Concrete Provide Feedback Next >