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How do you simplify ?

How to find the value of ?

The New River Gorge Bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -20°C and 35°C?

A parallel plate capacitor has a charge on one plate of q = 1.5E-06 C. Each square plate is d1=2.7 cm wide and the plates of the capacitor are separated by d2 = 0.25 mm. The gap is filled with air, e=  

 (a) What is the voltage between the plates, Δ V, in V?

(b) what plate width would double this voltage, in centimeters

Consider the reaction Mg(OH)_2(s) → MgO_(s) + H₂O_(l), with the enthalpy of reaction ΔH_rxn=37.5kJ/mol. What is the enthalpy of formation of MgO_(s)?

What is Classical Dichotomy in Economics?

The following questions test your understanding of the concept of Classical Dichotomy:

Ginny spends all her money on magazines and donuts. In 2015, she earned $14.00 per hour, the price of a magazine was $7.00, and the price of a donut was $2.00.

1. Which of the following gives the nominal value of the variable? Choose all that apply.

A. The price of a donut is 0.29 price of a magazine in 2015.

B.Ginny's wage was 2 magazines per hour in 2015

C.The price of a donut is $2 in 2015.

2. Which of the following gives the real value of the variable. Choose all that apply.

A.The price of a magazine is $7 in 2015

B.Ginny's wage was $14 per hour in 2015

C.The price of the magazine is 3.5 donuts in 2015.

How to find the sum of unit vectors and ?

How are economic decisions made in a command economy?

What is the Jazz Age?

How many unpaired electrons do lithium have?

A 0.005-kg bullet traveling horizontally with a speed of 1.00 x10^3 m/s enters an 18.6-kg door, embedding itself 11.8 cm from the side opposite the hinges as in the figure below. The 1.00-m-wide door is free to swing on its hinges.
(a) Before it hits the door, does the bullet have angular momentum relative to the door's axis of rotation?
1. yes or no?

(b) Is mechanical energy conserved in this collision? Answer without doing a calculation.