Physics Work,Power & Energy Level: Misc Level
A charge of -3.0 uC is fixed in place. From a distance of 4.5 cm, a particle of mass 7.2 g and charge-8.0 uC is fired with an initial speed of 65 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero?
Hint:KE+EPE=0energy is conserved.
Physics Work,Power & Energy Level: Misc Level
A steam turbine producing 15 kW of mechanical power is operating at 35% thermodynamic efficiency. Determine the heat input per hour to the steam turbine.
Physics Kinetic Theory Of Gases Level: Misc Level
Determine the mean free path for nitrogen molecules at 20%C and 1 atm. Hint: Assume a molecular diameter of 2.00x10-100 m.
Physics Heat & Thermodynamics Level: Misc Level
petrol vapour is injected into the cylinder of a car engine when the piston is in its expanded position. The volume, pressure and temperature of the resulting gas-air mixture are 2cm 3 ,1-00x105 N m-3 and 20%C. The fuel mixture is then compressed adiatically to a volume of 38 cm3, Determine the pressure and temperature of the fuel mixture after compression has occurred.
Physics Heat & Thermodynamics Level: Misc Level
A cylinder closed off with a movable piston contaions 15.0 g of stcam at 100% C. The system is heated and its temperature increases by 10.2%C. as the steam expands 30 um3 at a constant pressure of 0.7 MPa.
Determine the:
a)work done by the steam
b)change in internal energy of the system.
Physics Current Electricity Level: Misc Level
An RLC series circuit consists of a 15 uF capacitor, a 78.0 Q resistor and a 90 mH inductor.The oscillator is set for 560 Hz outputs a sinusoidal ] voltage of 105 V. Determine the:
a) current flowing in the circuit
b)voltage drop across each of the circuit elementts.
Physics Waves And Oscillations Level: Misc Level
A woman with perfect pitch, standing next to a railroad track on still day, hears a whistle of an approaching train and recognises it to be a true concert A (440Hz).After the train passes she notices the pitch has dropped to true F natura 1 (349 Hz).How fast is the rain moving ? What was the actual frequency of the whistle?
Physics Modern Physics Level: Misc Level
An electron needs 2.2 eV to escape from a potassium surface.If ultraviolet light of wavelength 350 nm falls on the potassium surface, what is the maximum KE of the emitted electrons?
Physics Modern Physics Level: Misc Level
After 4,800 years, how much of an original sample of 1.5 grams of radium (half- life=1,600 years) will remain?
Physics Modern Physics Level: Misc Level
Actinium- 220 (atomic number 89)undeergoes two successive negative beta decays. Find the atomic number, mass number,and chemical name of resulting nucleus.
Mathematics Complex Numbers Level: Misc Level
The problems need to be solved using the equation in the complex number system:1)10x^+6x+1=0 (2) x^4+3x^2-4=0
Mathematics Complex Numbers Level: Misc Level
This problems needs to be simplifyed and written in a +bi form: 1) (1+3i) (1-4i) (2) 4i^3-2i^2+1
Mathematics Coordinate Geometry Level: Misc Level
Looking for the midpoint between the line segment of the points these 2 problems:
1) P1=(-4,-3) andP2=(2,2) (2) P1=(2,-3) and P2=(1,-2)
Mathematics Coordinate Geometry Level: Misc Level
Looking for the distance between the points on the first two problems:1) P1=(-4,-1) and P2= (-2,-5) P1 =( 2,-3) p2=(4,2)
Physics Electrostatics Level: Misc Level
The energy stored in a 52 micro Farad capacitor is used to melt a 6.0 mg sample of lead. To what voltage must the capacitor be initially charged assuming that the initial temperature of the lead is 20 degrees Celcius.
