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Artículos

• Kinetic energy of a moving projectile (8317)
  19 de septiembre de 2024, por F_y_Q

  Calculate the kinetic energy of an 18 g projectile moving horizontally at .

• Efficiency and useful power (8300)
  7 de septiembre de 2024, por F_y_Q

  A motor is supplied with a power of 1 000 W. If the efficiency of this motor is , calculate the useful power and the lost power.

• Defining pressure, heat and the Molecular Kinetic Theory for gases
  5 de noviembre de 2012, por F_y_Q

  Define, with your own words, the following concepts:
  a) Pressure
  b) Heat
  c) Molecular Kinetic Theory for gases.

• Mass, volume and density in International System of Units (3662)
  9 de agosto de 2016, por F_y_Q

  What are the units of mass and volume in SI? What will be the unit of density in SI?

• Atomic number and atomic mass (3444)
  6 de enero de 2016, por F_y_Q

  An element has an atomic number of 10 and an atomic mass of 20. How many neutrons does this element have?

• Lengthening of a spring when a force is applied (4843)
  11 de noviembre de 2019, por F_y_Q

  A spring has an elastic constant of 120 N/m. Calculate how much it will lengthen if a force of 35 N is applied.

• Solutions: Percentage by mass (1931)
  10 de noviembre de 2012, por F_y_Q

  Make a solution by mixing 22 g of sugar and 240 mL of milk. Determine the percentage by mass of this solution. How much sugar is needed to prepare 500 g of solution with the same concentration?
  Average density of milk is .

• General gas law (8316)
  17 de septiembre de 2024, por F_y_Q

  Calculate the final temperature of a gas enclosed in a volume of 2 L at 1 atm, if we reduce its volume to 0.5 L and its pressure increases to 3.8 atm.

• Conversion of units (1930)
  8 de noviembre de 2012, por F_y_Q

  a) The normal body temperature is . Express this value in K.
  b) If an object has a temperature of 354 K, what is its temperature in Celsius?

• Waves: question about sound (3304)
  26 de agosto de 2015, por F_y_Q

  Is sound able to travel through a vacuum?