Physics Electrostatics Level: Misc Level
Determine the capacitance and the maximum voltage that can be applied to a Teflon-filled parallel -plate capacitor having a plate area of 1.75 cm squared and insulation thickness of 0.040 mm.
Physics Work,Power & Energy Level: Misc Level
Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Two identical balls with mass m=0.540 kg are dropped from a height of 2.0 m, but one of the balls is positively charged with q1=+550 microCoulombs and the second is negatively charged with q2=-550 microCoulombs. Use conservation of energy to determine the difference in the speed of the two balls when they hit the ground. (neglect air resistance)
Physics Current Electricity Level: Misc Level
Suppose that you wish to fabricate a uniform wire out of 1.0 gram of copper. If the wire is to have a resistance of R 0.50 ohms, and all of the copper is to be used, what will be the length and diameter of this wire?
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
An electrical field of magnitude 2.0 x 10^4 N/C exists perpendicular to the Earth,s surface on a day when a thunderstorm is brewing. A car of rectangular size 6.0 m by 3.0 m is traveling along a roadway sloping down at 10 degrees. Determine the electric flux through the bottom of the car.
Physics Modern Physics Level: Misc Level
In nuclear fission, a nucleus of uranium -238, which contains 92 protons, divides into two smaller spheres, each having 46 protons and a radius of 5.9x10^-15 m. What is the net force on this pair of molecules? (electrical and gravitational)
Physics Electrostatics Level: Misc Level
Four identical point charges (q=+10 micro Coulombs) are located on the corners of a rectangle.The dimensions of the rectangle areL=60 cm and W=15 cm. Calculate the net electric force exerted on the charge at the lower left corner by the three other charges.
Physics Electrostatics Level: Misc Level
Three identical small styrofoam balls (m=2.0g) are suspended from a fixed point by three non -conduting threads, each with a length of 50 cm and with negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 30 cm. What is the common charge"q" carried by each ball?
Physics Modern Physics Level: Misc Level
From the total energy release in a typical uranium fission dtermine approximately how many meV are realeased by each (nuchon uranium or proton ) when we assume that eacdh nucleon releases the same amant of energy.
Physics Heat & Thermodynamics Level: Misc Level
Calculate the maximum thermal efficiency of a heat engine operating with the same T(high) as a nuclear reactor . Use 20% celsius for T(low ).Explain why nuclear reactor has a low themal efficiency.
Physics Work,Power & Energy Level: Misc Level
At the bow of a ship on a stormy sea, a crwman conducts an experiment by standing on a bathroom scale. In calm waters, the scale reads 180 Ib. During the storm, the crewman finds a maximum reading of 224 Ib and a minimum reading of 121 Ib.
(a) Find the maximum upward acceleration experienced by the crewman.m/s2
(b) Find the maximum downward acceleration experience by the crewman. m/s2
Physics Vectors Level: Misc Level
An object on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a magnitude of 6.1 N: a second force has a magnitude of 4.1 N and points in the negative y direction. Find the direction and magnitude of the third force acting on the object. N
Physics Force & Laws Of Motion Level: Misc Level
A catcher stops a 84 mi/h pitch in glove ,bringing it to rest in 0.17 m. If the force exerted by the catcher is 803 N, what is the mass of ball?
Physics Force & Laws Of Motion Level: Misc Level
In a grocery store, you push a 14.5 kg shopping cart with a force of 10.0 N If the cart start at rest, how far does it move in 3.00 s?
Physics Waves And Oscillations Level: Misc Level
A light string with a mass per unit length of 9.00 g/m has its ends tied to two walls separated by a distance equal to three-fourths the length of the string/ An object of mass m is suspended from the center of the string , putting a tension in the string.
(a)Find an expression for the transverse wave speed in the string as a function of the mass of the hanging object.(Answer in terms of the mass m.) m/s
Physics Waves And Oscillations Level: Misc Level
A vacuum cleaner produces sound with a measured sound level of 62.0 dB.
(a) What is the intensity of this sound in W/m2? pu answer in W/m2
(b) What is the pressure amplitude of the sound? 0.03580 mPa
