A 11 pF capacitor is connected in series with a 3 pF and 7 pF capacitor that are connected in parallel. The three capacitors are connected to a 31 V battery. (Show all your work!) A) What is the equivalent capacitance of the circuit? B) How much charge is on the 11 pF capacitor? C) What is the potential difference across the 3 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.
In: Physics
The plates of an air-filled parallel-plate capacitor with a plate area of 15.0 cm2 and a separation of 8.95 mm are charged to a 170-V potential difference. After the plates are disconnected from the source, a porcelain dielectric with
κ = 6.5
is inserted between the plates of the capacitor.
(a) What is the charge on the capacitor before and after the dielectric is inserted?
|
Qi |
= | C |
|
Qf |
= | C |
(b) What is the capacitance of the capacitor after the dielectric
is inserted?
F
(c) What is the potential difference between the plates of the
capacitor after the dielectric is inserted?
V
(d) What is the magnitude of the change in the energy stored in the
capacitor after the dielectric is inserted?
J
In: Physics
A robot moves in rectilinear motion along the ? axis to the
positive ? direction. The motion starts
from rest at x = 0 at time t = 0. During the time interval 0 … 6 s
the acceleration of the robot is (in
units of m/s2, when t is in seconds)
a(t)=2t, when t=0...2s
a(t)=-t+6, when t=2...6s
Give the corresponding expressions for a) the velocity v(t) and b) the position x(t) of the robot as functions of time in the interval 0 … 6 s. What are c) the final velocity v(6 s), and d) the final position x(6 s) of the robot?
In: Physics
A satellite of mass mS orbits the Earth (with mass m_E and radius R_E) with a velocity v and an altitude h. The gravitational force F_G and the centripetal force F_C are given by:
F_G = G(m_S · m_E)/(R_E + h)^2 ,
F_C =(m_S · v^2)/(R_E + h) ,
G = const.
(a) Find an equation for the kinetic energy E_kin(h) of a satellite with an altitude h.
(b) Based on the kinetic energy, how much liquid hydrogen (energy density: 10^6J/Litre) is at least needed to bring a small 1 kg satellite in an orbit of 400 km. (Use literature to find m_E, R_E, G.)
In: Physics
A battery is constructed from these two half reactions:
i. VO2+ + 2 H+ + e- → V3+ + H2O Eo = 0.337 V vs SHE
ii. TiF62 ̶ + 4 e- → Ti(s) + 6 F ̶ Eo = ̶ 1.191 V
(a) (0.2 pt) Which half reaction is in the anode compartment? Circle one: vanadium rxn titanium rxn
(b) Which half reaction is in the cathode compartment? Circle one: vanadium rxn titanium rxn
(c) Write the balanced chemical equation for the overall battery reaction.
(d) Show the shorthand notation for representing this particular battery:
(e) Calculate the Eo of the battery.
In: Chemistry
A laser beam of intensity I irradiates at normal incidence a face of area A of a cubical sample of intrinsic silicon of volume V. The photons from the laser beam are absorbed uniformly throughout the Si sample.
(i) If the quantum efficiency of intrinsic Si is ?, determine an
expression for the electron-hole pair generation rate in the Si
sample.
(ii) Determine an expression for the excess carrier concentration, ??, under steady state conditions.
(iii) Calculate the ratio of the conductivity under illumination, ?light, to the conductivity without illumination, ?dark, for a Si sample of V =1 cm3,
A = 1 cm2, I = 1 mW cm-2, ? = 632.8 nm and ? = 0.3.
In: Physics
A physicist builds a parallel-plate capacitor with adjustable spacing between the plates. When the plates are at their initial separation, the capacitance is 7.00 µF.
(a) At this capacitance, the capacitor is connected to a 18.00 V battery. After fully charging, how much energy (in µJ) is stored in the capacitor?
(b) The battery is then disconnected. Without discharging the capacitor, the physicist then doubles the separation between the plates. At this point, how much energy (in µJ) is stored in the capacitor?
(c) Without changing this new separation between the plates, the capacitor is discharged, and then reconnected to the 18.00 V battery. Now, after fully charging, how much energy (in µJ) is stored in the capacitor?
In: Physics
A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is a = 0.1 m and the inner radius of the outer shell is b = 0.2 m. a. What is the capacitance, C, of this capacitor? b. Suppose the maximum possible electric field at the outer surface of the inner shell before the air starts to ionize E max(r=a) = 3.0*10^6 V/m . What is the maximum possible charge on the inner capacitor? c. What is the maximum amount of energy stored in this capacitor? d. When E (r=a) = 3.0*10^6 V/m, what is the potential difference between the shells?
In: Physics
Write a 200- to 400-word essay about the most important thing you learned while watching "Presidential Power" and "Presidential Powers 2." Please answer based on the video-thank you
Please watch the video- there are short videos.
you easy can be find on youtube by typing: Presidential Power: Crash Course Government and Politics #11
https://www.youtube.com/watch?v=5l02sK5LovI&index=11&list=PL8dPuuaLjXtOfse2ncvffeelTrqvhrz8H
easy can be find on youtube by typing: Presidential Powers 2: Crash Course Government and Politics #12
https://www.youtube.com/watch?v=fnHb-zyWh14&index=12&list=PL8dPuuaLjXtOfse2ncvffeelTrqvhrz8H
In: Economics
1. Find and read the following cases
2. Answer the following questions
In: Accounting