Answers edited by Daniel W.

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• A rock weighs 2.25 Newtons when suspended in air. In water, it appears to weigh only 1.8 Newtons. Why?
  
• In Figure (1), a 3.50 g bullet is fired horizontally at two blocks at rest on a frictionless table. The bullet passes through block 1 (mass 1.47 kg) and embeds itself in block 2 (mass 2.02 kg). The blocks end up with speeds v1 = 0.590 m/s and v2 = 1.45 ?
  
• Question #5a91f
  
• Why do electric lines of force never cross?
  
• How can I calculate the ideal gas law equations?
  
• What is the meaning of "Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit".?
  
• Question #67f33
  
• A ball with a mass of `3 kg` and velocity of `5 m/s` collides with a second ball with a mass of `7 kg` and velocity of `- 1 m/s`. If `25%` of the kinetic energy is lost, what are the final velocities of the balls?
  
• Question #8f92d
  
• Question #baf29
  
• What is moment of force?
  
• Question #22336
  
• How does physics relate to music?
  
• An object with a mass of `4 kg`, temperature of `240 ^oC`, and a specific heat of `15 J/(kg*K)` is dropped into a container with `15L` of water at `0^oC`. Does the water evaporate? If not, by how much does the water's temperature change?
  
• If a `2 kg` object is being constantly accelerated from `0m/s` to `15 m/s` over `6s`, how much power is being applied at `t= 3`?
  
• Question #9a1d2
  
• How does the Bohr atomic model differ from Rutherford's?
  
• Using the law of reflection, explain how powder takes the shine off of a person’s nose. what is the name of the optical effect?
  
• Question #886e9
  
• A resting car starts accelerating with a = 5.0 m/s^2, then it goes uniformly, and finally, decelerates at the same rate (a) and comes to a stop. The total time of motion equals t = 25 s. The average velocity is v= 72 kmph. How long does it move uniformly?
  
• If the speed of rotation of AC generator is made four times of its initial value then what is the percentage increase in induced emf?
  
• A bolt is to be tightened with a torque of 8.0 N*m. If you have a wrench that is 0.35 m long, what is the least amount of force you must exert?
  
• How does an astronomical unit differ from a light year?
  
• If there is a sphere made up of one hemisphere of Copper and another of iron, On heating what would be its effect and where would its centre of gravity be?
  
• How can momentum be increased?
  
• Question #d0a1c
  
• What properties of light that can best be explained by the wave theory. What other properties can be explained by the particle theory?
  
• How the doppler effect is used in medicine?
  
• An apple falls from a tree and hits the ground 9.35 m below. With what speed will it hit the ground?
  
• What is the difference between an electric motor and an electric generator?
  
• Person A travels up in an elevator at uniform acceleration. During the ride, he drops a ball while Person B shoots an arrow upwards directly at the ball. How much time will pass after Person B shot the arrow before the arrow hits the ball?
  
• A `5 L` container holds `15` mol and `6` mol of gasses A and B, respectively. Every three of molecules of gas B bind to two molecule of gas A and the reaction changes the temperature from `360K` to `210K`. By how much does the pressure change?
  
• What is the cue ball's momentum after the collision? What is the 5-ball's kinetic energy after the collision? What was the cue ball's momentum before the collision? What was the speed of the cue ball before the collision?
  
• Question #9b08b
  
• Question #3eb9d
  
• How does kinetic molecular theory explain the Charles' law?
  
• Person A travels up in an elevator at uniform acceleration. During the ride, he drops a ball while Person B shoots an arrow upwards directly at the ball. How much time will pass after Person B shot the arrow before the arrow hits the ball?
  
• Can velocity be zero if accelerating?