Answers edited by Paul N.

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• Question #6703e
  
• How can I construct an electromagnetic brake, whereby the energization of an electromagnet coil would produce mechanical "drag" on a rotating shaft without the need for contact between the shaft and a brake pad?
  
• What is the underlying reason why harmonics sound good?
  
• Question #f4537
  
• Question #d6af2
  
• Question #cc214
  
• Question #61797
  
• What arrangement of paths would make a circuit not light? For example, where can you NOT place wires in order to keep the circuit working.
  
• Question #f48ec
  
• Question #c8aad
  
• 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 ]#?
  
• A car after completing its journey returns to its original position.Name two physical quantities which are zero of the car and explain why?
  
• Question #95491
  
• How is acceleration of falling objects affected by gravity?
  
• Question #8aca8
  
• How do you solve #5/(x+4) = 5/(3(x+1))#?
  
• Question #18f6f
  
• What does it mean when two point charges form a dipole a small distance away from each other?
  
• What is the constant of proportionality?
  
• Does gravity push or pull?
  
• 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 #c26f4
  
• Question #ac43a
  
• Is cosmic background radiation hot?
  
• What is the density of wood?
  
• Question #c9c71
  
• What is the period of the Great Clock's, Big Ben, pendulum?
  
• Why is a diffraction grating better than a prism?
  
• How does gravity change with mass?
  
• Question #574be
  
• How does latent heat affect cooking?
  
• How does force differ from impulse?
  
• 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?
  
• Why does my height not vary with temperature? Has the ruler dilated?
  
• 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 #e9c21
  
• Question #04b77
  
• What is capacitance?
  
• Question #84585
  
• If two people are pulling on the same rope at #"10 N"# of force, what is the tension on the rope?
  
• 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?
  
• 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?
  
• Question #f4ee7
  
• Question #7a915
  
• What is the usual waveform of an AC power circuit?
  
• Question #5487e
  
• Question #0673b
  
• Question #33405
  
• What kind of interactions are described by the Standard Model?
  
• Question #13c34
  
• Question #574be
  
• Question #78dbb
  
• Question #f4ee7
  
• How can two magnets demonstrate magnetic force?
  
• Question #8f7d2
  
• A car and a computer monitor are dropped from the top of a cliff. Which one hits the ground first? Why?
  
• Question #20659
  
• Question #c8bd5
  
• Question #96843
  
• What happens after Sun burns all of its Helium to Carbon in its RedGiant state?
  
• What is the wavelength at which the human body emits the most radiation?
  
• Question #8c72e
  
• Question #d75be
  
• What quantity changes among charge stored, voltage involved, and capacitance in the following?
  
• Question #c834a
  
• If you have steel and wood at 0 °C, which feels colder? If you have steel and wood at 100 °C, which feels hotter?
  
• Question #a5982
  
• Question #7ff3b
  
• How can I make an atomic model?
  
• Question #8ba8b
  
• Question #8eda1
  
• Why is acceleration negative in a free fall?
  
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