Explain why (A × B) x (C × D) and A × (B × C) × D are not

College Physics 1
Problem 53PE Some makes of older cars have 6.00-V electrical systems. (a) What is the hot resistance of a 30.0-W headlight in such a car? (b) What current flows through it?

Organic Chemistry 7
a. Which of the following has a nonpolar covalent bond? b. Which of the following has a bond closest to the ionic end of the bond spectrum? \(\mathrm{CH}_{3} \mathrm{NH}_{2}\) \(\mathrm{CH}_{3} \mathrm{CH}_{3}\) \(\mathrm{CH}_3\mathrm{F}\) \(\mathrm{CH}_{3} \mathrm{OH}\)

Process Dynamics and Control 3
In a thermostat control system for a home heating system (a) Identify the manipulated variable (b) Identify the controlled variable (c) How is a valve involved in the control system? What does it manipulate? (d) Name one important disturbance (it must change with respect to time).

Probability and Statistics for Engineers and Scientists 4
Suppose that the random variable X has a probability density function f (x) =2x for 0 x 1. Find the probability density function and the expectation of the random variable Y in the following cases. (a) Y = X3 (b) Y =X (c) Y =1/(1+ X) (d) Y =2X

Consumer Behavior 6
What is perception, and what methods do we use to perceive stimuli?

Urban Economics 8
Consider a region where the self-sufficient wage is constant at $4. Suppose the payoff from innovation in a city with population n (measured in thousands) is a. Suppose a group of 1 (thousand) workers form a city. Will other workers have an incentive to join the cluster? b. Suppose a group of 9

Urban Economics 8
Consider the effects of a natural disaster like hurricane Katrina on a metropolitan economy. In the initial (pre hurricane) equilibrium, total employment in the metropolitan area is 500,000 workers and the daily wage is $100. The price elasticity of supply of labor is 4.0 and the price elasticity of

College Physics: Explore and Apply 2
If on a hot summer day you place one bare foot on a hot concrete swimming pool deck and the other bare foot on an adjacent rug at the same temperature as the concrete, the concrete feels hotter. Why?