All of the following are advantages of the cross-sectional study except?

a- is quick & less expensive

b- typically includes a larger sample

c- provides quick info about age differences

d- increases confidence in results

In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?