Answers created by Paul N.

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• Question #ab344
  
• Is it correct that the potential difference in closed loop is zero? Why??
  
• Question #0944f
  
• Question #3a0d4
  
• Question #f0050
  
• Question #52bae
  
• Question #e8598
  
• What type of quantity is momentum?
  
• Question #b0701
  
• A bucket filled with water weighing 50kg is raised from a well of depth 100m.if the linear density of the rope is 1kg per metre.then the work done is?
  
• Question #691a9
  
• Question #03446
  
• Question #f4184
  
• Question #415f8
  
• Question #72a44
  
• A particle located in one dimensional potential field has potential energy function U(x) = #a/x^2 - b/x^3# where a and b are positive constants. The position of equilibrium corresponds to x =?
  
• Question #c1648
  
• Is it possible for something to be a perfect ohmic conductor?
  
• A student suggests that the alternative concept of a whole-life might be simpler than a half-life. The whole-life would be the time required for all the radioactive nuclei in a sample to decay. Why would this suggestion not work?
  
• What is the function of the grounding wire? Is it to neutralize objects (to remove excess charge)?
  
• Question #c6145
  
• A candle is 7 in tall after burning for 1 h. The same candle is 5.5 in tall after burning for 4 h. How tall will the candle be after burning for 6 h?
  
• Question #6851a
  
• Question #0a988
  
• Question #a3649
  
• How have geologists determined the age of earth?
  
• Question #11259
  
• Starting from rest, a particle is constrained to move in a circle of radius #4 m#. The tangential acceleration is #a_t = 9 m/s^2#. How long will it take to rotate #45º#?
  
• Question #5f353
  
• Question #d6af2
  
• Question #091d3
  
• A pendulum swings through an angle of 48°. The pendulum is 45 inches long. How far does the end (or tip) of the pendulum travel in one pass?
  
• Which type of waves are associated with resonance?
  
• Why do two wires with current flowing in the same direction attract each other, and two wires with current flowing in opposite direction repel?
  
• Question #99b49
  
• Question #12ba5
  
• A truck is traveling at 90km/h when the driver sees an obstacle 85m away. The driver brakes and decelerates at #3.80m/s^2#. Determine: A) the time required to stop. B) the distance required to stop. C) the distance to reach half the initial speed?
  
• If a horizontal component of force #F_x=25.0# #N# and a vertical component of force #F_y = 15.0# #N#, what is the resultant force?
  
• Question #7ff3b
  
• Question #7a915
  
• The force applied against an object moving horizontally on a linear path is described by #F(x)=xe^x+ 1/x #. By how much does the object's kinetic energy change as the object moves from # x in [ 1, 3 ]#?
  
• The kinetic energy of an object with a mass of #3 kg# constantly changes from #60 J# to #270 J# over #8 s#. What is the impulse on the object at #5 s#?
  
• Question #56ea6
  
• Question #e9c21
  
• Question #7409d
  
• Question #78dbb
  
• A 24 Ω loudspeaker and an 8 Ω loudspeaker are connected in parallel across the terminals of an amplifier. Assuming the speakers behave as resistors, how do you calculate the equivalent resistance of the two speakers?
  
• Is cosmic background radiation hot?
  
• A car travels 40 miles in the first hour and 50 miles in the second hour. What is the car's average speed over the entire trip?
  
• If the length of a #12 cm# spring increases to #20 cm# when a #10 kg# weight is hanging from it, what is the spring's constant?
  
• Is the universe expanding, contracting, or staying the same size?
  
• What unit of measurement is used when calculating the distance between earth and the sun?
  
• Question #96843
  
• What acceleration will you give to a 27.7 kg box if you push it with a force of 86.1 N, in terms of meter per seconds squared?
  
• A rock in a sling is swung around in a circle. How would the centripetal force change if the rock was 9 times lighter?
  
• A dart is thrown horizontally with an initial speed of 10m/s toward point P,the bull's eye on a dart board.It hits at point Q on the rim,vertically below P,0.19s later. What is the distance PQ? How far away from the dart board is the dart released?
  
• On earth, two parts of a space probe weigh 12500 N and 8400 N. These parts are separated by a center-to-center distance of 23 m and are spherical. How do you find the magnitude of the gravitational force that each part exerts on the other out in space?
  
• A ball is thrown into the air at some angle. At the very top of the ball's path, what is always 0?
  
• Question #b4e13
  
• What is a single mirror?
  
• A stick figure is pushing three boxes across the screen. The mass of the blue box is 74kg, the mass of the red box is 86kg and the mass of the yellow box is 16kg. What is the friction force on the red box?
  
• Question #c8bd5
  
• Question #779a6
  
• A 3.96 μF capacitor and a 7.94 μF capacitor are connected in series across a 14.0 V battery. What voltage would be required to charge a parallel combination of the same two capacitors to the same total energy?
  
• What is the standard reference level to use in physics when measuring Gravitational Potential Energy (GPE)?
  
• Question #e5a47
  
• Why does my height not vary with temperature? Has the ruler dilated?
  
• Question #d99e0
  
• Question #b50ce
  
• Question #369d9
  
• Question #48cbd
  
• If two people are pulling on the same rope at #"10 N"# of force, what is the tension on the rope?
  
• Question #a5982
  
• Question #fef36
  
• Question #20659
  
• Question #d59a0
  
• How does diffraction pattern change with wavelength?
  
• Question #c67a6
  
• Question #ba1dc
  
• Is Coulomb's law an inverse square law? Why?
  
• How does acceleration relate to distance?
  
• Question #84776
  
• Why should I put capacitors in parallel?
  
• How does physics help in developing computer games?
  
• Question #d6066
  
• Question #18f6f
  
• Question #7af2a
  
• Does nuclear fission create chain reactions?
  
• What are associated anti-particles?
  
• Does gravity push or pull?
  
• Question #d0b4a
  
• Question #61aaa
  
• Question #8e654
  
• Question #5487e
  
• Which scientist is credited with the collection of the data necessary to support the planet's elliptical motion?
  
• Question #acf5c
  
• What atomic model is in use today?
  
• Question #08f3b
  
• Why do Satellites in geostationary(parking) orbits, made to orbit the earth at the equator and not at other places?
  
• Question #5b174
  
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