Answers edited by Steve J.

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• Question #3ab6b
  
• 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?
  
• 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?
  
• Question #bf625
  
• Question #a790e
  
• Does a man do work when he carries a 75 N bag horizontally for 5 m? Why / why not?
  
• The density of aluminium is 2700kg/m^-3.calculate the mass of a block of aluminium which has a volume of 100cm3?
  
• Why does a sprinter running in a 200 m event lean towards the centre of the curve he is rounding?
  
• Question #8c491
  
• 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?
  
• What should I look at? What formula do I use? How should I approach this problem? Any help/advice/tips is appreciated.
  
• Question #dfcf3
  
• Question #a00fc
  
• Question #bed07
  
• Question #85239
  
• 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 #?
  
• How do you find the values of the indicated functions?
  
• Question #6f534
  
• Question #14068
  
• Question #12d58
  
• Question #44212
  
• Question #ec537
  
• How do I convert m/s to km or km/h?
  
• A wave has a wavelength of 5 meters and a frequency of 3 hertz. What is the speed of the wave?
  
• What is the horizontal range of the stone when the stone strikes the ground?
  
• How do you solve and check your answers for #d- 5= - 24#?
  
• 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?
  
• Constant speed vs constant acceleration - When will B catch up A?
  
• Question #1013b
  
• What is the angle between F and d in each case?
  
• 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 #df915
  
• Question #0d546
  
• Question #ce8dd
  
• 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?
  
• Does the same current pass through each bulb in a parallel circuit?
  
• Question #89b77
  
• Question #190c1
  
• 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?
  
• If the net force on an object is zero, can the object be moving?
  
• Question #e4341
  
• We need to find the energy equivalent and the speed. Can I get some help please? Thanks!
  
• Question #63466
  
• Question #6dda3
  
• 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?
  
• 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?
  
• Question #9846e
  
• Question #0fa98
  
• Does the mass of a pendulum affect its period?
  
• Oh Hi there, can you help me real quick please? Thanks :)
  
• What do slope values from the tangents of position-time graphs represent?
  
• 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?
  
• 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?
  
• Vectors Please Help ( What is the direction of vector A + vector B?)
  
• Question #fb7d5
  
• 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 ?
  
• 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?
  
• Question #12fc0
  
• How much work would it take to push a # 2 kg # weight up a # 2m # plane that is at an incline of # (5pi) / 12 #?
  
• 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 #3c4fa
  
• Question #fbddf
  
• Which of the following pairs of vectors will have the smallest cross product? Not sure how to do this.
  
• Question #838a1
  
• 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 #9859e
  
• 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?
  
• 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 ?
  
• 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 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?
  
• 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 ?
  
• Question #b0a53
  
• Question #00f8c
  
• Question #96d50
  
• Change in momentum?
  
• Question #13bdf
  
• 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#?
  
• 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?
  
• 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 #c4f46
  
• 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?
  
• Question #c18da
  
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