A couch was pushed with a force of 11 N across a smooth floor for 8 seconds. What was the impulse applied to the couch? O 88 kgm/s
O 0.727 kgm/s
O 19 kgm/s
0 1.38 kgm/s

(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.)

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Write down two additional questions about earth's magnetic field that will make your presentation more informative.