Answers edited by Steve J.

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• What is the force, in terms of Coulomb's constant, between two electrical charges of #22 C# and #-32 C# that are #6 m # apart?
  
• Question #bf625
  
• The red light has the longest wavelength in spectrum so according to equation e=hc/lamda but than why it proves ienstine equation e=mc^2 wrong?
  
• Question #12fc0
  
• Vectors Please Help ( What is the direction of vector A + vector B?)
  
• Alex collides with a a as he runs through his office. If the combined momentum of Alex and the desk was 400 kg m/s to the north before the collision, what is their combined momentum after the collision?
  
• What is the angle between F and d in each case?
  
• A circular piston exerts a pressure of 80 k Pa on a fluid, when the force applied to the piston is 0.2kN. What is the diameter of the piston ?
  
• Does the mass of a pendulum affect its period?
  
• Change in momentum?
  
• Question #8c491
  
• Two asteroids bump in space. The larger one has a mass of 3000 kg and the smaller one has a mass of 100 kg. f the force of the collision is 10,000 newtons on each asteroid, what are their accelerations?
  
• We need to find the energy equivalent and the speed. Can I get some help please? Thanks!
  
• Question #96d50
  
• Question #fb7d5
  
• Question #9859e
  
• How do I convert m/s to km or km/h?
  
• Does a man do work when he carries a 75 N bag horizontally for 5 m? Why / why not?
  
• Question #6f534
  
• Question #1013b
  
• Question #df915
  
• A person on a swing takes 2.0 seconds to travel from her highest backward point to her highest forward point. What is the frequency of her swinging?
  
• If the net force on an object is zero, can the object be moving?
  
• There are two separate fixed frictionless inclined planes making angle #60^o# and #30^o# with the horizontal. Two blocks A and B are kept on both of them. Find the relative acceleration of A with respect to B?
  
• With what minimum acceleration mass M be moved on frictionless surface so that m remains stick to it. The co-efficient of friction between M and m is u?
  
• Question #3c4fa
  
• For a constant force, suppose the duration of impact on an object is doubled. How much is the impulse increased? How much is the resulting change in momentum increased?
  
• A wave has a wavelength of 5 meters and a frequency of 3 hertz. What is the speed of the wave?
  
• Question #6dda3
  
• Question #ec537
  
• Is the tension of the string when the stopper is at the top of the circle the same, greater than, or less than the tension of the string when the stopper is at the bottom of the circle?
  
• An electric toy car with a mass of #2 kg# is powered by a motor with a voltage of #4 V# and a current supply of #2 A#. How long will it take for the toy car to accelerate from rest to #1 m/s#?
  
• Question #44212
  
• Question #3ab6b
  
• Question #bed07
  
• How much work would it take to push a # 2 kg # weight up a # 2m # plane that is at an incline of # (5pi) / 12 #?
  
• Question #b0a53
  
• Does the same current pass through each bulb in a parallel circuit?
  
• How can you increase a machine's efficiency?
  
• A ball with a mass of #1 kg # and velocity of #7 m/s# collides with a second ball with a mass of #6 kg# and velocity of #- 4 m/s#. If #40%# of the kinetic energy is lost, what are the final velocities of the balls?
  
• Question #e4341
  
• What do slope values from the tangents of position-time graphs represent?
  
• A voltage of #180# #V# is placed across a substance. The current begins higher, but as the substance's temperature changes it falls to #6# #A#. What is the resistance of the substance at this point?
  
• Question #fbddf
  
• Question #13bdf
  
• A ball floats on the surface of water in a container exposed to atmosphere. Will the ball remain immersed at its initial depth or will it sink or rise some what if the container is shifted to moon?
  
• Question #9846e
  
• Question #ce8dd
  
• Question #838a1
  
• Question #0fa98
  
• One car is travelling along a straight road at 60km/h while another car is travelling around a circular track at 60km/h. Are they travelling with the same velocity? If not, why?
  
• A mile is 5280 ft long. 1 ft is approximately 0.305 m. How many meters are there in a mile? How many kilometers (km) are there in a mile?
  
• Question #a00fc
  
• How do you find the values of the indicated functions?
  
• A total of 640 joules of work is done on a 50.-kilogram object as it is moved 8.0 meters across a level floor by the application of a horizontal force. What is the magnitude of the horizontal force applied to the object?
  
• Ripples are produced on water surface in a bucket. the separation between consecutive crests is mm and the ripples produced on surface at a speed of 2 cm per second. How many crests hit the wall of the container per second ?
  
• An object with a mass of #5 kg# is revolving around a point at a distance of #3 m#. If the object is making revolutions at a frequency of #1 Hz#, what is the centripetal force acting on the object?
  
• Question #a790e
  
• Question #c18da
  
• Question #0d546
  
• Question #00f8c
  
• Question #c4f46
  
• Two tuning forks a and b of frequency 200 hz and 200 hz are vibrated simultaneously. Then the ratio of time taken by the sound a and b to travel 660m and 490m respectively in air is ?
  
• Question #12d58
  
• Question #dfcf3
  
• Oh Hi there, can you help me real quick please? Thanks :)
  
• The frequency of a tuning fork is 384 per second and velocity of sound in air is 352 m/s. How far the sound has traveled while the fork completes 36 vibrations ?
  
• Question #190c1
  
• Question #89b77
  
• Which of the following pairs of vectors will have the smallest cross product? Not sure how to do this.
  
• The density of aluminium is 2700kg/m^-3.calculate the mass of a block of aluminium which has a volume of 100cm3?
  
• How do you solve and check your answers for #d- 5= - 24#?
  
• Question #63466
  
• Constant speed vs constant acceleration - When will B catch up A?
  
• How much work would it take to push a #15 kg # weight up a # 5 m # plane that is at an incline of # pi / 12 #?
  
• What is the horizontal range of the stone when the stone strikes the ground?
  
• What should I look at? What formula do I use? How should I approach this problem? Any help/advice/tips is appreciated.
  
• Question #85239
  
• If a #3/2 kg# object moving at #5/3 m/s# slows to a halt after moving #4/3 m#, what is the coefficient of kinetic friction of the surface that the object was moving over?
  
• Question #14068
  
• Why does a sprinter running in a 200 m event lean towards the centre of the curve he is rounding?
  
• You are applying force on the pan of single pan weighing balance and the pointer points to #100 g#. What is the force in newtons applied by you?
  
• A car's begin speed is 70 km/h and it accelerates with 6000 km/#h^2# . How many seconds does it take to get from 70 km/h to 120 km/h and what distance did the car need ?
  
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