Problem 12.8 A 120 g ball and a 200 g ball are connected by a 37-cm-long, massless, rigid rod. The balls rotate about their center of mass at 140 rpm . Part A What is the speed of the 120 g ball? Express your answer to two significant figures and include the appropriate units. HÀ m v = 4,5741589 S

A 0.450-kgkg ice puck, moving east with a speed of 5.80 m/sm/s , has a head-on collision with a 0.990-kgkg puck initially at rest. Assume that the collision is perfectly elastic.     Part A What is the speed of the 0.450-kgkg puck after the collision? Express your answer to three significant figures and include the appropriate units.

Part A A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure (see the figure (Figure 1)). The pulley is a uniform disk with mass 11.6 kg and radius 48.0 cm and turns on frictionless bearings. You measure that the stone travels a distance 12.4 m during a time interval of 3.50 s starting from rest. Find the mass of the stone. Take the free fall acceleration to be 9.80 m/s. ΑΣφ kg Submit Request Answer • Part B Find the tension in the wire. Take the free fall acceleration to be 9.80 m/s². 圈] ? Submit Request Answer Provide Feedback Figure 1 of 1 MacBook Air

Part A In the fall of 2002, a group of scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60.0 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a chain reaction. Neptunium-237 has a density of 19.5 g/cm³. What would be the radius r of a sphere of neptunium-237 that has a critical mass? Express your answer in centimeters to three significant figures. ▸ View Available Hint(s) r = 跖 ΕΠΙ ΑΣΦ 0 ? cm

The engine of a model rocket is rated with a total impulse of 5.50 N·s and a thrust duration of 1.10 s. What is the average force exerted by the engine?

A smal, dosely wound col has N tuns, area A, and resistance R. The col is intaly in a unform magnetic feld that has magnitude B and a drection perpendicular to the plane of the loop. The collisthen rapidly pulled out of the field so that the flux through the collis reduced to zero in time At. Part A What are the magnitude of the average emf E, and average curent I, induced in the col? Express your answer in terms of the variables N, A, R, B. and At. AZ + * O O ? E, Iy= • Part B The total charge Qthat fows though the col is given by Q= IavAt. Derive an expression for Q in terms of N, A, B, and R Note that Q does not depend on At. Express your answer in terms of the variables N, A, R, and B. ? Q=

A 430 g, 8.5-cm-diameter can is filled with uniform, dense food. It rolls across the floor at 1.5 m/s . Part A What is the can's kinetic energy? Express your answer with the appropriate units. μA Value Units

A merry-go-round is a common piece of playground equipment. A 3.0-m-diameter merry-go-round, which can be modeled as a disk with a mass of 280 kg, is spinning at 16 rpm. John runs tangent to the merry- go-round at 5.4 m/s, in the same direction that it is turning, and jumps onto the outer edge. John's mass is 30 kg. Part A What is the merry-go-round's frequency, in rpm, after John jumps on? Express your answer in revolutions per minute to two significant figures. VE ΑΣΦ w = 23 Submit Previous Answers Request Answer ? * Incorrect, Try Again; 5 attempts remaining rpm

The 500 kg concrete culvert has a mean radius of 0.5m. Part A If the truck has an acceleration of 3 m/s?, determine the culvert's angular acceleration. Assume that the culvert does not slip on the truck bed, and neglect its thickness. (Figure 1) Express your answer with the appropriate units. HÀ ? a = Value Units Submit Request Answer Figure 1 of 1 Provide Feedback Next > 4 m 3 m/s 0.5m