Physics Circular Motion Level: Misc Level
A 0.254 diameter circular saw blade rotates at a constant angular speed of 117 rad/s. What is the tangential speed of the tip of saw tooth at edge of the blade?
Physics Electrostatics Level: Misc Level
The earth has an electric field with a magnitude of approximatly 100 v/m near its surface.What is the potential difference between a point on the ground and a point on the same level as the top of the Washington Monument (555 ft high).
Physics Electrostatics Level: Misc Level
Nerve cells are long, thin cylinders along which electrical disturbances (nerve impulses) travel. The cell membrane of a typical nerve cell consists of an inner and outer wall separated by a distance of . 10 um. The electric field within the cell membrane is 7.0x10 to the 5th N/C.Approximating the cell membrane as a parallel-plate capacitor, determine the magnitude of the charge density on the inner and outer cell walls.
Physics Properties Of Matter Level: Misc Level
A volume of 50.0 liters of oxygen at 10% C and an absolute pressure of 1.88 atm is compressed to 36.6 liters, and at the same time the temperature is raised to 80%C. What will the absolute pressure be now?P=
Physics Heat & Thermodynamics Level: Misc Level
An engine operates at half its theoretical (carnot )efficency between 545% C and 310%C. What is the efficiency of the engine?
Physics Heat & Thermodynamics Level: Misc Level
A 1-kg chunk of ice at 0% C melts, absorbing 80,000 cal of heat in the process. Which of the following best describes what happens to this system?
a.increased entropy
b.lost entropy
c.entropy maintained constant
d.work converted to energy
Physics Kinetic Theory Of Gases Level: Misc Level
The absolute temperature of an ideal gas is directly proportional to which of the following properties (when taken as an aveage )of the molecules of that gas?
a.speed
b.momentum
c.mass
d.kinetic energy
Physics Heat & Thermodynamics Level: Misc Level
In a cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. Theis will cause the temperature of the air in the clouds to;
a.get warmer
b.get cooler
c.be completely unaffected
d.There is no air in clouds
Physics Heat & Thermodynamics Level: Misc Level
Which of the following processes of heat transfer may take place in a vacuum?
a.conduction
b.convection
c.radiation
d.induction
e.None of the above choices are valid
Physics Electrostatics Level: Misc Level
If a capacitor has 3.77 uC of charge on it and an electric field of 1.82 kV/mm is desired if they are separated by 4.21 mm of air, what must each plate,s area be?
Physics Electrostatics Level: Misc Level
A charge Q creates an electric potential of+ 259 V at a distance of 14.3 cm. What is Q?
Physics Electrostatics Level: Misc Level
What is the speed of a 3.31 keV electron?
Physics Electrostatics Level: Misc Level
An electric field of 710 V/m is desired between two parallel plates 17.7 mm apart. How large a voltage should be applied?
Physics Electrostatics Level: Misc Level
A uniform electric field of magnitude 261 V/m is directed in the negative x direction. A-11.0 uC charge moves from the origin to the point (x,y)=(17.3 cm,53.9 cm). What was the change in the potential energy of this charge?
Physics Electrostatics Level: Misc Level
A lightning flash transfers 4.08 C of charge and 3.03 MJ of energy to the Earth. Between what potential difference did it travel?
b.An electron starting from rest acquires 4.90 ke V of kinetic energy in moving from point A to point B. How much kinetic energy would a proton acquire, starting from rest at B and moving to point A?
