Two wires of equal cross- section one made up of aluminium and other of brass are joined end to end. When the combination at wire is kept under tension the elongation in wires are found to be equal. Find the ratio of lengths of two wires. (Y = 7 × 101º N/m² and %3D AL Y = 9.1 x 1010 N/m?).

As a researcher, you are trying to obtain some 2D materials using exfoliation. You put some adhesive tape onto a piece of graphite that is 2 cm by 3 cm. You pulled the tip of the tape at an angle of 35° from the horizontal direction, and the tip of a thin graphene sheet of about 0.001 mm started to be separated from the bulk. How much force did you apply on the tape? The exfoliation strength of graphene is 21.9 × 106 N/m² Таре Таре Таре Side view (magnified) Top view

In the figure below, suppose the length L of the uniform bar is 3.50 m and its weight is 240 N. Also, let the block's weight W = 350 N and angle 0 30°. The wire can withstand a maximum tension of 500 N. C - X→ com В (a) What is the maximum possible distance x before the wire breaks? (b) With the block placed at this maximum x, what is the horizontal component of the force on the bar from the hinge at A? N (right) (c) What is the vertical component of this force? N (up)