Supposed to vacuum cleaner uses 120 j of electrical energy. if 45 j used to pull air into a vacuum cleaner, how efficient is the vacuum cleaner?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

(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.)

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.