Physics Electrostatics Level: University
CapacitorFind voltage across and charge on each capacitor for circuits below.
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Physics Alternating Current Level: University
Draw wave form for average current if the voltage across a 5 micro F capacitor is as shown.Question Diagram
Physics Alternating Current Level: University
Transient CurrentThe capacitor is initially charced to 3V with polarity shown.
(a) Find the mathematical expressions for the voltage Vc and the current Ic when switch is closed.
(b) Sketch the wave forms for Vc and Ic.
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Physics Alternating Current Level: University
Charging and Discharging of Capacitior(a) Determine time constant.
(b) Write mathematical equation for voltage Vc following the closing of switch.
(c) Determine Vc after one three and five constant.
(d) Write the equations for current Ic and VR
Sketch the wave form for Vc and Ic.
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Physics Work,Power & Energy Level: University
Spring ForceA railroad freight car of mass M and inital speed v0rolls without friction in the positive x direction (see figure below). The car is brought to rest by a spring bumper with spring constant k on a second freight car with its breaks locked. (a) Find the distance the spring is compressed in terms of M v0 and k. (b) Is the momentum and mechanical energy conserved during the collision? use the correct physics principles to explain your response. (c) Sketch a graph of the potential energy of the spring versus the compression distance of the spring.
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Physics Work,Power & Energy Level: University
Conservation of MomentumThe owners of an amusement park have hired you to determine if their design for a new loop the loop ride is safe. The car has a speed of 5m/s when it located on the tracks at a height h. The car coasts along the track going around the inside of the vertical circle of radius r = 100m. The car is not physically bolted to the tracks but rides on the track in the same way as a railroad car rides on ordinary railroad tracks. The bottom of the circle is at ground level and the schematic drawing of the ride is shown below. The circular tracks have already been constructed and the blueprints speeify a starting height 220m. However the owners are not sure whether this height is well above the minimum height for which the car will stay on the tracks at the top of the circle. You have been consulted before the construction begins on the starting track to determine if this proposed height is safe. The coefficient of friction between the tracks and the wheels is 0.0. (a) What force if any does the track exert on the car at point B? Point C? Identify by name the physics principles you use. Assume that the car has mass 500kg. (b) Will the car remain on the tracks if the blueprints starting height is used? If yes show using the correct physics principle (s). If no find the exact angle where the car leaves the tracks(c). Based on your calculations what would you advise the owners to do? Determine the minimum height h for the car to just stay on the tracks. Use the safer of the two starting heights for all the remaining questions. (d) Determine the velocity of the car when it reaches the bottom of the circle when it reaches point A when it reaches the top of the circle. Identify the physics principles that use. (e) Does the car execute uniform circular motion? Explain. (f) If a 70 kg rider is seated in the car what force does she exert on the seat when the car reaches the bottom of the track? If she were seating on scales what it read at the bottom of the track? Identify the physics principles that you use.
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Physics Force & Laws Of Motion Level: University
Resultant ForceWhile a 300 kg airplane is in horizontal filight its engines provide 9000N of force while an 8000N force opposes the motion of the plane. What is the approximate acceleration of the plane?
Physics Force & Laws Of Motion Level: University
VectorA plane has a vertical speed of 20m/s and a horizontal speed of 100m/s. What is the total speed of the plane?
Physics Misc Topic Level: University
RefractionLight rays are incident on aparallel-sided glass slab of refractive
Index=1.40 at an angle of 50 degrees.
If the slab is standing in air draw alabelled diagram ( Not to scale) Showing the path of the light through the block by calculations show that the as the angle of incidence.
Physics Properties Of Matter Level: University
Pressure and DensityAbuiders brick has dimensions 20cm x 12cm x 5cm. What is its volume in m3?
(ii) The density of brick is 2.1 x 10 to the power 3kgm-3 what is the mass of the brick? What its weight?
(iii) Show diagramatically how you would place the brick to produce the maximum pressure and the minimum pressure on a surface. Calculate
Physics Properties Of Matter Level: University
FluidCalculate the pressure in Nm-2 ( thats to the power negative two) due to water at depth of 2.5 metres in a swimming pool. Thke the density of pool water to be 1000kg m ( to the power negative3)
(ii) Express this pressure in kPa
(iii) By how much would the pressure increase if you were swimming at a depth of 2.5m in sea water which has a density of 1030 kg m ( to the power-3)
Physics Misc Topic Level: University
LightAn object is situated 30 cm infront of aconverging lens of focal length 10cm.
(i) Whats is the power of the lens?
(ii) Calculate the position of the image
(iii) Calculate the magnification of the image. Is it erect or inverted Real or virtual?
Physics Current Electricity Level: University
Ohm's Law and grouping of resistanceDetermine the cunents I1 and I2
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Physics Current Electricity Level: University
ResistanceDetermine the total resistance.
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Physics Gravitation Level: University
Orbital VelocityA newly found planet with a density of 4850kg/m^3 has no atmosphere and is orbited by a low altitude satellite with an orbital speed of 3.55 km/s. What is the mass of the planet?
