Load distance of 15cm and the effort at the distance of 30 cm from the fulcrum, calculate its efficiency. calculate i. work done by load
ii. work done by effort
iii. M. A
iv. V. R 15 cm
v. efficiency [Friction is neglected]
​

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.