What is the answer to part B?

Part A:

Through what potential difference ?V must electrons be accelerated (from rest) so that they will have the same wavelength as an x-ray of wavelength 0.160 nm ?

Answer: 58.8

Part B: Through what potential difference ?V must electrons be accelerated so they will have the same energy as the x-ray in Part A?

Use 6.63×10^?34 J?s for Planck's constant, 3.00×10⁸ m/s for the speed of light in a vacuum, and 1.60×10^?19 C for the charge on an electron. Express your answer using three significant figures.

A hydroelectric with 0.2 m radius coils has permanent magnets that immerse the coils in a magnetic field of 0.5 T. If the maximum torque that the turbines can produce is 750 Nm and it is sought to generate a maximum voltage of V = (1414.3 V) sin (wt) at an average rms power of 2x10 ^ 4 W. a) What maximum current the turbine should generate, b) how many turns should the coil have, c) what radius should the coil cable have? d) if it is to be transported at 50 kvrms, how many turns should the secondary inductor of the transformer have for each turn of the primary?

Gotcha Covered Manufactures and sells leather cases for cell phones. Each Case sells for $80. Variable Manufacturing cost are $30 per case. We pay a sales commission of 10% of the selling price to our salespeople. Fixed manufacturing costs are $200,000 and fixed operating costs are $35,000.

A. Calculate the Following Amounts:

i. V (variable cost per unit) and VC% (Variable cost percentage)

ii. CM ( Contribution margin per unit) and CM% ( Contribution Margin Percentage.

IV. Quantity

V. Target quantity if we want to generate Operating Income= $100,000

1. The speed of the wave on your Cello string is: 90 m/s

The length of your string is: 690 mm

Keep in mind that the wavelength (λ), the frequency (f) and the wave speed (v) are related according to v = f λ.

(a) Draw the shapes of the motion of the string for vibration that your string will produce when plucked or bowed (up to the 6th Harmonic). (Of course, a plucked or bowed string will vibrate in multiple modes simultaneously.)

(b) Determine the wavelength (in centimeters) for each vibration.

(c) Determine the resonant frequency (in hertz) for each vibration.

(d) Determine the period (in seconds) for each vibration.

Consider a galvanic cell based upon the following half reactions: Cu2+ + 2e- → Cu 0.34 V Fe3+ + 3e- → Fe -0.0036 V How many of the following responses are true? 1. Decreasing the concentration of Cu2+ (assuming no volume change) will decrease the potential of the cell 2. Increasing the concentration of Fe3+ (assuming no volume change) will increase the potential of the cell 3. Adding equal amounts of water to both half reaction vessels will increase the potential of the cell 4. Increasing the mass of the Cu will change the initial potential of the cell 5. Cu2+ is being reduced during the reaction

2. Let G be a bipartite graph with 10^7 left vertices and 20 right vertices. Two vertices u, v are called twins if the set of neighbors of u equals the set of neighbors of v (triplets, quadruplets etc are defined similarly). Show that G has twins. Show that G has triplets. What about quadruplets, etc.?

3. Show that there exists a bipartite graph with 10^5 left vertices and 20 right vertices without any twins.

4. Show that any graph with n vertices and δ(G) ≥ n/2 + 1 has a triangle.

A 13 pF capacitor is connected in series with a 5 pF and 9 pF capacitor that are connected in parallel. The three capacitors are connected to a 26 V battery.

A) What is the equivalent capacitance of the circuit?

B) How much charge is on the 13 pF capacitor?

C) What is the potential difference across the 5 pF capacitor?

D) A parallel plate capacitor of plate area A and plate separation d is fully charged using a battery of emf=V. While connected to the battery the plates are pulled apart until the new separation is 3d. Find the change in potential energy when you pull the plates apart

One mol of an ideal gas described by Ti = 300 K, Vi = 2.46 L, and Pi = 10 atm undergoes isobraic expansion (constant pressure) until V = 5 L. Next, it undergoes a reversble isothermal (constant temperature) expansion until P = 1.00 atm followed by isobaric compression to T = 300 K. Finally, it is restored to its original state by reversible, isothermal compression.

a) Depict this cyclic process on a P-V diagram.

b) Calculate w, q, deltaU, and deltaH for each step and for the total cyclic process. (Cv,m=3/2R)

By computing both sides, show that for an m × n matrix A, vectors u and v ∈ Rn , and a scalar s ∈ R, we have (a) A(sv) = s(Av); (b) A(u + v) = Au + Av; (c) A(0) = 0. Here 0 denotes the zero vector. Is the meaning of 0 on the two sides identical? Why or why not? Hint: Let x = (x1, . . . , xn) and y = (y1, . . . , yn) be vectors in Rn . The definition of vector equality is that x = y if and only if, for each i between 1 and n, we have xi = yi . So verify this property for the vectors in (a), (b), (c).