Which statement best describes the importance of joints in the roadways of Bridges ? a. Joints strengthen the roadway to support cars and trucks

b. Joints allow the roadway to expand and contract with varying outside temperatures

c. Joints allow the roadway to expand and contract as cars put force on the bridge

d. Joints allow the bridge to be built in smaller, easier to assemble pieces.

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