Balance this nuclear reaction by supplying the missing nucleus. replace each question mark with an appropriate integer or symbol. 249 98 cf

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What do you think car designers do if the damage caused by a crash test is too severe?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)