Two concrete spans of a 120 m long bridge are placed end to end so that no room is allowed for expansion. 120 m t t + 20◦c y if the temperature increases by 20◦c, what is the height to which the spans rise when they buckle? assume the thermal coefficient of expansion is 1.2 × 10−5 ( ◦c)−1 . answer in units of m.

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603

Describe cytokinesis in plants and animals. in animals: in plants.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.