Physics Electrostatics Level: Misc Level
A thin spherical conducting shell has an inner radius of 6.8 cm and an outer radius of 7.0 cm. The shell carries a net charge of + 5 p C which results in a surface charge density magnitude on the inner surface of ( Hint: What do you know about the electric field due to a conductor? also find the surface charge density on the outter surface.
Physics Electrostatics Level: Misc Level
Two infinite parallel surfaces carry uniform charge densities of 0.20 n C/ m 2 and - 0. 60 n C /m 2. What is the magnitude of the electric field at a point between the two surfaces? (Assume the planes are nonconducting. It may help to draw a sketch showing the electric field lines between the planes.)
Physics Electrostatics Level: Misc Level
A charge of uniform surface density 0.20 n C /M2 is distributed over the entire xy - plane. What is the magnitude of the electric field at any point having z = 2.0 m? ( Assume the plane is nonconducting. )
Physics Electrostatics Level: Misc Level
A charge of 0.80 n C is placed at the center of a cube that measures 4.0 m along each edge. What is the electric flux through one face of the cube?
Physics Electrostatics Level: Misc Level
A point charge + Q is located on the x -axis at x = a, and a second point charge - Q is located on the x - axis at x = - a. A Gaussian spherical surface with radius r = 2 a is centered at the origin. The flux through this Gaussian surface is
a. zero because the net charge enclosed by the Gaussian surface is zero
b. greater then zero
c. zero because at every point on the surface the electric field has no component perpendicular to the surface
d.zero because the electric field is zero at every point on the surface
e.none of the above
Physics Electrostatics Level: Misc Level
A uniform linear charge density of 4.0 n C /m is distributed along the entire x - axis. Consider a spherical ( radius = 5.0 cm ) surface centered on the origin. Determine the electric flux for this surface.
Physics Electrostatics Level: Misc Level
Charges q and Q are placed on the x -axis at x = 0 and x = 2. 0 m, respectively. If q = 40 p C and Q = + 30 p C, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin.
Physics Electrostatics Level: Misc Level
Two charges of 15 pC and -40 p C are inside a cube with sides that are 0.40 m in length. Determine the net electric flux for the surface of the cube.
(Note:1 p C= 1 x 10 -12 C. )
Physics Waves And Oscillations Level: Misc Level
A commuter train passes a passenger platform at a constant speed of 40 m/s. The train horn is sounded at 320 Hz. (a) What over all change in freaquency is detected by the person on the platform as the train moves from approaching to receeding? (b)What wavelength is detected by a person on the platform as the train approaches?
Physics Waves And Oscillations Level: Misc Level
A sky rocket explodes 100 m above the ground. Two observers air spaced 200 m apart with observer A being directly under the explosion. What is the ratio of the sound intensity heard by observer A to that heard by observer B? Answer in book =Ia/Ic =5
Physics Waves And Oscillations Level: Misc Level
A noisy machine in a factory produces sound with a level of 80 db. How many indentical machines could you add to the factory with out exceeding the 90 db limit? Answer in book =9 additional machinesA
Physics Waves And Oscillations Level: Misc Level
You are watching a peer being constructed on the far shore of a salt water inlet when some blasting occures. You hear the sound in the water 4.50 seconds before it reaches you through the air. How wide is the inlet? Assume the air temperature is 20 degrees Celcius.Anwer in book =1.99 km
Physics Work,Power & Energy Level: Misc Level
A Weight lifter manages to snatch a 104 kg weight a distance of 1.5 m. How many kcal of heat energy are equivalent to this lift?
Physics Heat & Thermodynamics Level: Misc Level
How much energy (in J ) is removed from the human body by the evaporation of 9.9 g of water?
Hint: The latent heat of vaporization is 54 kcal /kg for water. Please use only the heat of vaporization, and not the energy required to raise the temperature to 100 %C.
Physics Heat & Thermodynamics Level: Misc Level
If an object has a surface area of 0.7 m2 and an emissivity of 0.61, how much power (in W) does it radiate at a temperature of 34 % C?
