A100 kg object hangs from two steel cables, both with radius 1.2 mm. the first cable is 2.5 m long and 2 mm shorter than the second, but the object is horizontal (so they are now the same length). what is the force on the first cable? young's modulus for steel is 2.0 x 1011 n/m2.a : 470 nb : 500 nc : 850 nd : 1000 n

Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery