Write a paragraph to show how to apply TEM techniques in nanowire research?

An electron is released from rest on the axis of an electric dipole that has charge e and charge separation d = 33 pm and that is fixed in place. The release point is on the positive side of the dipole, at distance 9.4d from the dipole center. What is the electron's speed when it reaches a point 3.2d from the dipole center?

A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound. She finds it to be 0.36 s.

a) How far away is the explosion, in meters, if the air temperature is 18°C (with a velocity constant of v = 331 m/s) and if you neglect the time taken for light to reach the physicist?

b) Calculate the distance, in meters, to the explosion taking the speed of light into account. (Note that this distance is negligibly greater than what you found in part (a).)

I understand the equation to be used is v = vo (sqrt( T/273)) but how was this equation derived?

What are the three longest wavelengths for standing waves on a 240 cm long string that is fixed at both ends?

If the frequency of the second-longest wavelength is 50.0 Hz, what is the frequency of the third-longest wavelength?

A wire carries an I1 = 7.40-A current along the x-axis, and another wire carries an I2 = 5.85-A current along the y-axis, as shown in the figure below. What is the magnetic field at point P, located at x = 4.00 m, y = 3.00 m?

magnitude µT

direction

In the "Bohr model" of the Hydrogen atom, a single electron is said to have a circular orbit around the nucleus (in this case consisting of a single proton), analogously to how the Earth orbits the Sun. If the electron orbits at a distance of 1.5�10^-10 m, What is the electric force felt by the electron?   What speed must the electron have in order to maintain its orbit? ( in mi/hr and m/s)

Romeo is throwing pebbles gently up to Juliet's window, and he wants the pebbles to hit the window with only a horizontal component of velocity. He is standing at the edge of a rose garden h = 8.8 m below her window and L = 9.5 m from the base of the wall (Figure 1).

How fast are the pebbles going when they hit her window?

A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 10.0cm , and the outer sphere has radius 16.0cm . A potential difference of 150V is applied to the capacitor.

1-What is the energy density at r = 10.1cm , just outside the inner sphere? (J/m^3)

2-What is the energy density at r = 15.9cm , just inside the outer sphere?

The G string on a violin is 30 cm long. when played without fingering, it vibrates at frequency 196 Hz. The next higher notes on the scale are A(220 Hz), B(247 Hz), C(262 Hz), and D(294 Hz). How far from the end of the string must a finger be placed to play these notes?

• How does driving force factor into dendritic integration? And so then why is integration sublinear?

• What is dendritic attenuation? Why does it occur? Why does it matter?

• What is "shunting inhibition"? What properties could this provide neurons with for processing information?

• In the context of the simulations from NIA, what is meant by “deliberation time” for an AP?

• Describe the oscillations in mechanoreceptors simulation in detail based on the plots of voltage, current, and conductance.

• Is action potential size fixed over a range of inputs? Present evidence one way or the other from the third simulation in NIA.

A 0.480-kgkg hockey puck, moving east with a speed of 3.05 m/sm/s , has a head-on collision with a 0.800-kgkg puck initially at rest.

Assuming a perfectly elastic collision, what will be the speed (magnitude of the velocity) of each object after the collision?

A model of a red blood cell portrays the cell as a spherical capacitor, a positively charged liquid sphere of surface area A separated from the surrounding negatively charged fluid by a membrane of thickness t. Tiny electrodes introduced into the interior of the cell show a potential difference of 100 mV across the membrane. The membrane's thickness is estimated to be 103 nm and has a dielectric constant of 5.00.

(a) If an average red blood cell has a mass of 1.10 ✕ 10⁻¹² kg, estimate the volume of the cell and thus find its surface area. The density of blood is 1,100 kg/m³. (Assume the volume of blood due to components other than red blood cells is negligible.)

(b) Estimate the capacitance of the cell by assuming the membrane surfaces act as parallel plates.
F

(c) Calculate the charge on the surface of the membrane.
C

How many electronic charges does the surface charge represent?

Electrostatic Force and Equilibrium

Consider a rhombus with side of length L. The rhombus has two pair
of equal interior angles. Label one of these pair θ and the other φ. Four
identical, positive point charges, q are placed on the vertices of the rhombus.
Draw the configuration.

a) Obtain a symbolic expression for the electric field at one of the vertices
(your choice) and then at an adjacent vertex (Do you now know the electric
field at all of the vertices? Why/why not?). Does it matter that there is a
charge at the vertex? Comment on the direction of the electric field at your
two vertices. Does this make sense? Why?

b) We now allow the angles to vary, subject to the constraint that the figure
must remain a rhombus. Label one of the vertices P. What θ value and φ
value, (in degrees), minimizes the electric field at P . Hint: You should only
have to do one minimization, as there is a constraint between θ and φ.

c) Plot the magnitude of the electric field at P as a function of the angle
opposite P ( This will be θ or φ depending on how you labeled your figure).

Please show your work and explanation. Thanks for your help.

A metal block of mass 1.830 kg is hanging from a string. The tension in the string is 1.089×10¹ N. The block is submerged in a beaker of fluid and is stationary. What is the magnitude and direction of the buoyant force acting on the block?