Chapter 2, Problem 10P

Problem Six. A 70 kg student in the figure balances a 1200 kg elephant on a hydraulic lift with diameter 2.0 m that is filled with oil which has a density of 900 kg/m³. How many 80 kg students would have to stand on the first piston in order to raise the elephant by 2.55 m? 80 kg 1200 kg 17.) (A) 5 (D) 8 (B) 6 (E) 9 (C) 7 Oil 2.0 m 5

In the accompanying figure, the rails, connecting end pieces, and rod all have a resistance per unit length of 4.52/cm. The rod moves to the left at v = 5 m/s. If B = 0.3 T everywhere in the region, what is the current in the circuit (a) when a = 6.5 cm? (b) when a = 4 cm?

Problem Twelve. An object consists of four particles: m₁ =1.0kg, m₂ = 2.0kg, m3 = 3.0kg, ma = 4.0kg. They are connected by rigid massless rods to form a rectangle of edge lengths 2a and 2b, where a 7.0 m and b = 8.0 m. The system rotates about the x-axis through the center as shown. = Find the (x, y) coordinate of the center of gravity of the object (in meters). Use the geometrical center of the object as the origin. 2a 13 2b m M2 Axis of rotation 20.) (A) (-3.2, -1.4) (B) (-3.2, 1.4) (C) (5.2, -1.4) (D) (-1.8,-1.4) (E) (3.2,-5.2) Find the moment of inertia of the object about the x-axis and y-axis that run through the geometrical center of the object. Give an answer as (Ix, ly, I) in units of 10² kg-m². 21.) (A) (6.4, 4.9, 11) (D) (9.8, 11, 12.8) (B) (4.9, 6.4, 11) (C) (11, 12.8, 9.8) (E) (2.5, 10, 11) anul babogaus al bos ano 002 maldor If the object is spinning with angular velocity of 30 rpm around the axis of rotation shown in the diagram, find the rotational kinetic energy. Give…