Physics Electrostatics Level: Misc Level
[GRR2 16.P.059.]-/1 points No Response/ Show Details
In a uniform electric field of magnitude E, the field lines cross through a rectangle of area A at an angle of 43.0% with respect to the plane of the rectangle.What is the magnitude of the flux through the rectangle?Answer in terms of E and A.
Physics Electrostatics Level: Misc Level
[GRR2 16.P.057.]-/1 points No Response/ Show Details
An object with a charge of 0.820 uC is placed at the center of a regular icosahedron with 20 equivalent surfacees. What is the electric flux through one surface of the icosahedron?
Physics Electrostatics Level: Misc Level
[GRR2 16.P.044.]-/3 points No Response/ Show Details
A horizontal beam of electrons initially moving at 2.2 x 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates as shown in the diagram.The magnitude of the field is 2.50 104 N/C.
(a) What is the direction of the field between the plates?
1.up
2.down
3.right
4.left
(b) What is the charge per unit area on the plates?
(c) What is the vertical deflection d/of the electrons as they leave the plates?
Physics Electrostatics Level: Misc Level
[GRR2 16.P.0.18]-/1 points No Response/ Show Detailis
The Styrofoam balls with the same mass m =8.9 10-8 kg and the same positive charge Q are suspended from the same point by insulating threads of length L=0.98 m (the figure below).The separation of the balls is d=0.025m. What is the charge Q?
Physics Electrostatics Level: Misc Level
[GRR2 16.P.015.]-/2 points No Response/Show Details
Three point charges are fixed in place in the right triangle diagrammed below, in which q1=0.65 uC and q2=-0.51 uC. What is the electric force on the +1.0 uC charge due to the other two charges?
Physics Electrostatics Level: Misc Level
A balloon,initially neutral, is rubbed with plastic until it acquires a net charge of 0.53 nC.
(a) Assuming that only electrons are transferred, were electrons removed from the balloom or added to it?
1.removed
2.added
(b) How many electrons were transferred?
Physics Modern Physics Level: Misc Level
The isotope Cesium-137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for this isotope to decay to about one-sixteenth its original amount?
Physics Force & Laws Of Motion Level: Misc Level
Magnet A has twice the magnetic field strength of magnet B, and at a certain distance, it pulls on magnet B with a force of 50 N, With how much force, then does magnet B, pull on magnet A?
Physics Current Electricity Level: Misc Level
Rearrange the equation {current=voltage/resistance] to express resistance in terms of current and voltage. Then solve; A certain device in a 120- V circuit has a current rating of 20 A. What is the resistance of the device (How many ohms)?
Physics Electrostatics Level: Misc Level
Find the voltage change when (a) an electric field does 12 J of work on a 0.0001 -C charge, and when (b) the same electric field does 24 J work on a 0.000 2-C charge.
Physics Heat & Thermodynamics Level: Misc Level
If 50 grams of hot ware at 80 oC is poured into a cavity in a very large block of ice at 0oC, what will be the final temperature of the water in the cavity?How much ice must melt in order to cool the hot water down to this temperature?
Physics Heat & Thermodynamics Level: Misc Level
The specific heat capacity of ice is about 0.5 cal/g* OC. Supposing that it remains at that value all the way to absolute zero, calculate the number of calories it would take to change a 1-gram ice cube to absolute zero (-273 OC) to 1 gram of boiling water. How does this number of calories with the number of calories required to chabnge the same gram of 100OC boiling water to 100OC steam?
Physics Heat & Thermodynamics Level: Misc Level
A 10 -kg iron ballis dropped onto a pavement from a height of 100 m.If half of the heat generated goes into warming the ball, find the temperature increase of the ball.(In SI units,the specific heat capacity of iron is 450 J/kg*OC.) Why is the answer the same for an iron ball of any mass?
Physics Gravitation Level: Misc Level
Many people mistakenly believe that the astronauts orbiting the earth are above gravity, Calculate the acceleration due to gravity, g, for space shuttle territory, 200 kilometers above the earth,s surface. Earth,s mass is 6x1024 kg, and its radius is 6.38x106 m (6380 km). Your answer is what percentage of 9.8 m/s2?
Physics Electrostatics Level: Misc Level
A lightweight plastic slab is rubbed with a piece of fur. A second plastic slab, hanging from a string, is attracted to the first object and swing towards it. When the second plastic slab touches the first one ,it is suddenly repelled and swings away. Describe the physics of what has happened.
