Physics Electrostatics Level: University
CoulombThree charge particles A,B and C are located near one another. Both the magnitude and direction of the force that particle A exerts on particle B is independent of
(a) The sign of charge B
(b) The sign of charge A
(c) The distance between C and B.
(d) The distance between A and B
(e) The magnitude of the charge B.
Physics Electrostatics Level: University
Induction Of ChargeIA charged conductor is brought near an uncharged insulator. Which one of the following statements is true?
(a) Both objects will repel each other.
(b) Both objects will attract each other.
(c) Neither object exerts an electrical force on each other.
(d) The objects will repel each other only if the conductor has a negative charge.
(e) The objects will attract each other only of the conductor has a positive charge.
Physics Ray Optics Level: University
Wave DiffractionA speaker is designed for wide dispersion for a high frequency sound. What should be the diameter of a circular opening be in a speaker where the desired diffraction angle is 75 degree and a 9100 Hz sound is generated .The speed of sound is 343m/s
(a) 0.039 m
(b) 0.077 m
(c) 0.21 m
(d) 0.13 m
(e) 0.048m
Physics Waves And Oscillations Level: University
Speed of WaveThe tension in a taut rope is increased by a factor of 9. How does the speed of the wave pulses on the rope change if at all?
(a) The speed remains the same
(b) The speed is reduces by by a factor of 3.
(c) The speed is reduces by by a factor of 9.
(d) The speed is increased by a factor of 3.
(e) The speed is increased by a factor of 9.
Physics Heat & Thermodynamics Level: University
Carnot cycleA carnot refrigeration is used to make 1 kg of ice at - 10 C from 1 kg of water at 20 C, Which is also the temperature of the kitchen. How many joules of work must be done?
Physics Heat & Thermodynamics Level: University
Carnot EngineThe total drop of wollomombi Falls of Australia is 482 m. What would the carnot efficiency of an engine operating between top and bottom of the falls if the water temperature at the top were 10C and all the potential energy of the water at the top were converted to heat at the bottom?
Physics Heat & Thermodynamics Level: University
Carnot Engine
A carnot engine operating between 580 F and 120F has a power output of 120 hp. How much heat per minute does it absorb? How much does it exhaust?
Physics Heat & Thermodynamics Level: University
Cornot EngineThree designs for a heat engine to operate between 450 K and 300 K are proposed . Desing A is claimed to require a heat input of 2kJ for each kJ of work output design B a heat input of 3 kJ and design C a heat input of 4 kJ. Which design would you choose and why?
Physics Heat & Thermodynamics Level: University
The indicator diagram of a certain engine is shown in attachment. (a) Find the work done in each part of the cycle
namely a = b, b= c c= d and d=a ( substitute arrow for = sing)
and identify it as work done by or on the engine. (b) How much net work is done per cycle by the engine?
Physics Heat & Thermodynamics Level: Middle School
A gas expands by 1 L at a constant pressure of 2 bars. During the expansion 500 J of heat is added. Find the change in the internal energy of the gas.
Physics Misc Topic Level: University
CapacitorAn automatic external defibrillator delivers 125 J of energy at a voltage of 1050 V. What is the capacitance of this device.
Physics Electrostatics Level: University
CapacitanceA parallel plate capacitor has plates of an area of area . 0066m squared and a separation of .45mm. (a) Find the magnityde of the charge on each plate when the capacitor is connected to a 12-V battery. (b) Will your answer to part (a) increase decrease or stay the same if the separation between the plates is increased explain. (c) Calculate the magnitude of the charge on the plates if the separation is 90 mm.
Physics Electrostatics Level: University
PotentialConside a region in space where a uniform electric field E = 7500 n/c points in the negative x direction. (a) What is the orientation of the equipotential surfaces (b) if you move in the positive x direction does the electric potential increase or decrease. explain. (c) What is the distance between the + 14 - v and the + 16 - v equipotentials.
Physics Electrostatics Level: University
PotentialA square of a side a has charges + Q at each corner. What is the electric potential energy of this system of charges.
Physics Electrostatics Level: University
Potential(a) In the previous problem find the point to the left of the negative charge where the electric potential vanishes. (b) Is the electric field at the point found in part (a) positive, negative, or zero explain.
